The notation for arithmetic operators was an example. Internally, Prolog will use is(11,+(2,*(3,3))), but we can write 11 is 2 + 3 * 3. Such functors that can be written in between their arguments are called infix operators.
Contents
 1 What notation requires parentheses in order to correctly define the order of computation?
 2 What does the built in predicate cut (!) Do?
 3 What is the main reason of applying two step translation of high level programming language?
 4 What parameters are required when performing file operations fread and fwrite?
 5 Does coding use Pemdas?
 6 How does Pemdas work in programming?
 7 Why are cuts used in Prolog?
 8 What does + mean in Prolog?
 9 What is machine code written in?
 10 How is a programming language translated to machine code?
 11 Which of the following translates all highlevel instructions into machine code prior to running the program?
 12 What is the syntax of fread?
 13 Does fwrite write in binary?
 14 2.3 Arithmetic in Prolog
 15 Learn Prolog Now!
 16 Prolog Tutorial – 4
 17 4.1 Utility goals
 18 4.2 Universals
 19 4.3 Loading Prolog programs
 20 4.4 Arithmetic goals
 21 4.5 Testing types
 22 4.6 Equality of Prolog expressions
 23 4.7 Control
 24 4.8 Testing for variables
 25 4.9 Assert and retract
 26 4.10 Binding a logical variable to a numeric value
 27 4.11 Negation as failure
 28 4.12 Input/output
 29 4.13 Prolog terms and clauses as data
 30 4.14 Prolog operators
 31 4.15 Finding all answers
 32 Quiz Topics After the Midterm
 33 Module 12 Project
 34 Requirements
 35 Submission
 36 Prolog Operator
What notation requires parentheses in order to correctly define the order of computation?
PEMDAS is an acronym for the words parenthesis, exponents, multiplication, division, addition, subtraction. Given two or more operations in a single expression, the order of the letters in PEMDAS tells you what to calculate first, second, third and so on, until the calculation is complete.
What does the built in predicate cut (!) Do?
reduce possible answers of a question that is asked using the rule. What does the builtin predicate cut (!) do? Remove all existing backtracking points.
What is the main reason of applying two step translation of high level programming language?
to allow functions to return different types of values.
What parameters are required when performing file operations fread and fwrite?
What parameters are required when performing file operations fread and fwrite? The reason that we need to call fflush() or cin.
Does coding use Pemdas?
Most modern computer programming languages (probably all mainstream languages) follow the same rules for order of precedence for mathematical operations as PEMDAS, PEDMAS, BODMAS, BOMDAS, BIDMAS (they’re all the same).
How does Pemdas work in programming?
Multiplication and division come before addition and subtraction is a rule we learned in grade school. This rule still works. A common mnemonic to remember this rule is PEMDAS, or Please Excuse My Dear Aunt Sally. Precedence rules may vary from one programming language to another.
Why are cuts used in Prolog?
The cut, in Prolog, is a goal, written as!, which always succeeds, but cannot be backtracked. Cuts can be used to prevent unwanted backtracking, which could add unwanted solutions and/or space/time overhead to a query. The cut should be used sparingly.
What does + mean in Prolog?
Because of the problems of negationasfailure, negation in Prolog is represented in modern Prolog interpreters using the symbol +, which is supposed to be a mnemonic for not provable with the standing for not and the + for provable.
What is machine code written in?
It is usually written in binary. Machine code is the lowest level of software. Other programming languages are translated into machine code so the computer can execute them.
How is a programming language translated to machine code?
A compiler takes the program code (source code) and converts the source code to a machine language module (called an object file). Another specialized program, called a linker, combines this object file with other previously compiled object files (in particular runtime modules) to create an executable file.
Which of the following translates all highlevel instructions into machine code prior to running the program?
A compiler translates the entire program written in a highlevel language to machine language prior to execution.
What is the syntax of fread?
The syntax of fread() function is as follows: Syntax: size_t fread(void *ptr, size_t size, size_t n, FILE *fp); The ptr is the starting address of the memory block where data will be stored after reading from the file.
Does fwrite write in binary?
In line 48, fwrite() function is called to write the structure variable emp into the file in binary mode.
2.3 Arithmetic in Prolog
When it comes to doing complex mathematical calculations, Prolog is not the computer language of choice. Despite this, it does have certain mathematical ability. The formula for evaluating arithmetic expressions follows a pattern (whereExpressionis some arithmetical expression) Expression8 is represented by the letter X. In this case, the value ofExpression will be assigned to the variableX. As an illustration,? – Is X equal to 10 plus 5.X equals 15? yes? – X equals 10 minus 5.X equals 5 yes?
– X equals 10 / 5.X equals 2yes?
X = twenty yes It is vital to notice that the expression itself is not evaluated.
There are several other predefined Prolog arithmetic infix operators.


greater than  


less than  


=  greater than or equal to 


=  less than or equal to 


When it comes to heavyduty mathematics, Prolog is not the computer language of choice. Despite this, it does have some mathematical ability. In arithmetic expressions, the pattern for evaluating them is (whereExpressionis some arithmetical expression) Expression8 is represented by the letter “X.” The value ofExpression will be used to initialize the variable X. As an illustration, How much is X times five? X times ten is equal to fifteen. yes? Does the number 10 minus 5 equal 5? – Does the number X equal 10?
— 10/5 = 2Yes?
– X equals 10 + 5 * 6 / 3.X equals 20yes.
The infix operatoris/2 must be used to separate a variable from a result before collecting it.
2.3.1length/2
It is frequently beneficial to be able to compute (or doublecheck) the length of a list of items. This is something that we can now accomplish with the help of arithmetic operators. The starting point is the empty list, which has the obvious length of zero. As a result, we have the Prolog clause: The recursion asks us to simply add one for each item on the list, as follows: 9length(, N): 9length(, N): 9length(, N): – length(T, N1), where N is equal to N1 + 1.
2.3.2Exercises
Define the predicatesquare/2, which accepts a number as its first argument and returns the square of that number as its second argument in Exercise 10. (There will be no recursion in this one.) Define a predicatepower/3 that accepts numbers as its first and second parameters in Exercise 11. PandNand returns as the value of its third argument a number that is N to the power of P. For example,? power of N to the power of P. (3,2,P). P = 8 (yes). Remember that this needs the use of a recursive rule as well as the use of arithmetic.
Learn Prolog Now!
Worksheet10Develop a predicatesquare/2 that accepts a number as its first argument and returns the square of that number as its second parameter. It is not necessary to use recursion in this case. Define a predicatepower/3 that accepts numbers as its first and second parameters in Exercise11.
Specifically, PandNand returns a number that is N to the power of P as the value of its third parameter. For example,? power of PandNand (3,2,P). Eight yes votes for P. Notably, a recursive rule and the usage of arithmetic are required in order to do this.
Prolog Tutorial – 4
A descriptive description of the majority of the essential builtin Prolog objectives is provided in this chapter. Take a look at the: The SWI Prolog documentation server (link opens in a new window) may be found here.
4.1 Utility goals
Help(S) S should represent a symbolic atom, for example, help (assert). haltStops the Prolog process, allowing the operating system to restart. trace and notrace are used to turn on and off trace, respectively.
4.2 Universals
Help(S) assistance, for example, should be represented by the symbol S. (assert). stopProlog is terminated; the operating system is restarted. turn trace and turn notraceTurns on and off the trace function.
4.3 Loading Prolog programs
Help(S) S should be a symbolic atom, for example, “help” or “support” (assert). haltStops the Prolog process and restarts the operating system. trace and notrace are switches that turn on and off trace and notrace, respectively.
4.4 Arithmetic goals
NM, NM, N =M, N=M, NM, NM, NM These relationships test exactly what they appear to be testing. For these objectives to be successful or unsuccessful, M and N must obviously be tied to numerical values (and not to cause error).
4.5 Testing types
X is bonded to a symbolic atom, and Atom(X) determines if this is the case. As an illustration,? atom (foot). – yes? – the atom (3). – atom(‘foot’) if the answer is no. – yes? – the atom (“foot”). nointeger(X)Determines whether or not X is tied to a positive integer. real(X)Determines whether or not X is associated with a real number. string(X)Determines if X is associated with a string.
4.6 Equality of Prolog expressions
Testing whether or not X and Y can be united, and whether or not they cannot, are performed. For example,?=.X = a, Y = b, R =?=.noX =Y, X = YTests whether X and Y are now cobound, i.e., have been bound to or share the same value, or if they are not cobound at this time. Take, for example,? X = 3, Y = 1 * 3, X = Y.no? X = a.=,X = Y.X = a, Y = a.x = a, Y = a.no?
4.7 Control
Testing whether or not X and Y can be united, and whether or not they cannot. For example,?=.X = a, Y = b, R =?=.noX =Y, X = YTests whether X and Y are now cobound, i.e., have been bound to or share the same value, or if they are not cobound at this point. Take, for example,? X = 3, Y = 1 * 3, X = Y.no? X = a.=,X = Y.X = a, Y = a.x = a, Y = a.no?
4.8 Testing for variables
Ground(G) determines whether or not G contains any unbound logical variables. var(X) determines whether or not X is associated with a Prolog variable.
4.9 Assert and retract
Asserta(C) Assert clause C into the database first, followed by any subsequent clauses that share the same key predicate. It is the first predicate discovered while reading a clause from left to right that is referred to as the key predicate of the clause. invoking assertz(C), invoking invoking (C) Insert clause C into the database at the bottom of the list of clauses that have the same key predicate. retract(C) C should be removed from the database. It is necessary that C be suitably instantiated in order to identify the predicate key.
4.10 Binding a logical variable to a numeric value
X is EBinds the logical variable V to the numerical value of E. X is EBinds the logical variable V to the numerical value of E. A number or a numbervalued expression with customary parentheses, such as, for example, (2*Z + W)/4* Z W, must be used in the evaluation of the expression E.
This is assuming that Z and W are both bound to numbers at the time of evaluating the expression. ? X equals 22, Y equals X * 3, and Z equals sqrt (Y). X equals 22. Y is equal to 66. Z is equal to 8.12404.
4.11 Negation as failure
In the case of failure, not(Q), +QNegation as failure is defined by:not(), call(),!, fail. not(Q).
4.12 Input/output
A successful Seeing(X) is one where X is (or can be) connected to the current read port. The user’s input is represented by the letter X. see(X)Opens a port for the input file that is tied to the variable X. The port from which the subsequent input for’read’ is obtained is then used. seen ‘close’ closes any specified input port or file, and causes’read’ to look at the currently selected user. read(X) Reads a Prolog type expression from the current port and stores the result in the variable X.
 X=user is the output port in question.
 The output from the ‘write’ or ‘display’ commands is transmitted to that port as well.
 write(E) The current output port is used to write the Prolog expression connected to E.
 tab(N) Write N spaces to the output port that has been selected.
4.13 Prolog terms and clauses as data
It is successful when X is (or can be) tied to the current read port, which is shown by the success of seeing(X). Input is provided using the keybord. The function see(X) opens a port for the input file that is connected to the variable X. Afterwards, that port is used to receive further input for the function’read.’ seen ‘read’ will glance at the user after closing any specified input port or file. read(X) Obtains the value of the current port’s Prolog type expression and stores it in variable X.
 X=user is the current output port in this case.
 It is this port that receives any further output from the commands ‘write’ and ‘show’.
 write(E) The current output port is used to write the Prolog expression connected to E that was previously specified.
 tab(N) Input N spaces into the output port that you’ve chosen to use.
4.14 Prolog operators
: op : op : op : op (P,T,O). Declare the existence of an operator symbol. As an illustration, consider the following example of a source program: “has color” op(500,xfx,’has color’). a contains the color red. The color of b is blue. Then.? – b has color is a color. Is C.C. equal to red? – What has the color red in it. What is equal to a Pis precedence and an integer. P with a larger size has less precedent (ability to group). The values of the precedence numbers for builtins are determined by the Prolog system in use.
(For further information, consult the reference materials or use the help function by typing the word ‘operator’ into the search box.) This is the operator type: the nonassociative xfyinfix rightassociative yfxinfix leftassociative fxprefix nonassociative fyprefix rightassociative the nonassociative yfpostfix leftassociative the nonassociative xfyinfix rightassociative the nonassociative yfpostfix leftassociative The operator goes by the initials O.
Which symbols are available for use may be determined by the Prolog expression reader (i.e., which kind of Prolog you are using).
fx;xfy,xfynotfyis, =., and so on xfx+,yfx, fx*,/yfx, xfx+,yfx xfysmallerPvalue To ensure that the user’s operators are read in with the correct meaning, it is sometimes necessary to exercise patience while assigning proper precedence values to the operators.
4.15 Finding all answers
Findall(Things,GoalExpression,Bag)computes all Things that satisfy the GoalExpression and collects them in the list Bag once they have been calculated. If the GoalExpression fails, the Bag will be an empty list, as seen below. If all variables in GoalExpression are existentially quantified, findall handles them as if they were. a bagof(Things,GoalExpression,Bag) is a function that computes all Things that satisfy the GoalExpression and collects them in a list Bag. If GoalExpression fails, bagof will fail as well.
See Section 2.12 for several illustrations.
The Bag will be similar to bagof, with the exception that it will not include duplicates and will be sorted.
Quiz Topics After the Midterm
After the Midterm Exam, CS 331 Spring 2016Quiz Topics will be discussed. Following the Midterm Exam, the quiz subjects will be posted on the class homepage, which will be linked below (along with a few that perhaps should have been posted).
 In what way does being stackbased in a computer language differ from being objectoriented? Type checking in ANSI Forth is described in detail. Is it, for example, a static object? Dynamic? Nominal? Structural
 What exactly is a Forthword? What parameters are passed to Forth words and how are they used
 Convert a basic arithmetic statement written in C++ to Forth using this program. Examples:
 In Forth, convert the following C++ arithmetic expression into the following: 5 * 3 In Forth, translate the following arithmetic equation from C++ to English: ” (5 – 3)*(2 + 4) “
 To define a new Forth word, what is the proper syntax to be used? There are various different syntaxes
 Explain one of them. Please explain the precise meaning of a straightforward example of Forth stackeffect notation. Examples:
 Explain the exact meaning of the following Forth stackeffect notation: ” (a ) “
 Explain the exact meaning of the following Forth stackeffect notation: ” (a b – b) “
 Explain the exact meaning of the following Forth stackeffect notation: ” (a b – b) ” (a b – b a) “
 Explain the exact meaning of the following Forth stackeffect notation: ” (a b – a+b) “
 Explain the exact meaning of the following Forth stackeffect notation:
 What is the Forth representation of boolean values? Describe the Forthfetchandstoreoperations on global variables and how they work. What is an aprimitive phrase
 What does it mean
 The prefix notation is used in the scheme. What exactly does this mean? Convert an arithmetic expression into a Scheme expression. Example:
 It is possible to write ” (3+14)*(62)” in C++, Lua, and Haskell (as well as Zebu). This is written as ” 3 14 + 6 2 – * ” in Forth. Create a Scheme version of the same computation.
 The name of something (binding an identifier to a value) in Scheme is defined by the term “bind.” In class, we reviewed the differences between static (typically lexical) scope and dynamic scope. Which one does Scheme make use of (as a matter of course)
 Scheme supports conditional execution (also known as selection, similar to if, switch, and other similar constructs in C++) through the use of a facility that is similar to Haskell’s guards. What word is it that establishes such a structure
 To state that a programming language allows reflection means something different to different people. What is it about the Lispfamily programming languages that distinguishes them so drastically from all other programming languages? Your lecturer mentioned that Scheme and Common Lisp are “opposites” within the Lisp family of programming languages, and that this is true. So, in what sense does this hold true
 Explain the syntax for a list in the Scheme programming language. What does the term “Prolog” stand for
 Prolog is a declarative programming language. What exactly does this mean? Creating a straightforward Prolog fact. Example:
 What would be a plausible approach to translate the sentence “Fred is older than George” into Prolog, assuming that it is true? Consider this to be a way of describing a relationship between two people named Fred and George. Be cautious while using capitalization and punctuation.
 Translate the query “Who is older than George?” into Prolog using the information you gained from the previous challenge.
 What is a Prologterm
 How to interpret a description of a Prolog predicate
 And other related topics. Example:
 Let us suppose that I claim to have created the Prolog predicate foo/2. What exactly does this mean?
 Explain the facts, rules, and questions in Prolog. What is the meaning of each of these? What are the differences between them? Those variables that are utilized in a program and that allow us to run a program
 What does the expression ” foo(+A,?B) ” mean in ordinary Prolog notation
 When it comes to Prolog, what is the difference between ” = ” and ” = “
 What exactly is unification in the context of Prolog
 What makes unification more powerful than Haskell’s pattern matching is not immediately apparent. What is meant by a Prologgoal, and how can we set one? Explain what the aims of Prolog are and how they influence Prolog execution. What is the source of our initial aim when we run Prolog? Where does it originate from? When we are executing a Prolog program and working on a goal, we frequently move between subgoals to accomplish the objective. What is the source of these things
 Create a Prolog pattern that matches any list that has at least one item
 Consider the following scenario: we want to construct a function that accepts an integer and returns an integer. We wish to write it in the Prolog programming language. Prolog, on the other hand, does not contain any functions. What should we do?
Module 12 Project
In this PA, you will develop some analytic procedures that will be used to a data structure known as an expression tree You will work on projects that are comparable in nature in Ruby, Haskell, and Prolog, with the purpose of learning about the distinctions between the three languages. The dynamic objectoriented programming skills you will learn in Ruby will be gained through extending existing Ruby classes. You will create patternmatching functions in Haskell in order to get experience with functional programming.
The following are the project’s starting files:p4.zip
Requirements
You may choose to disregard Lexer.hsand Parser.hs. Their backend code for parsing basic mathematical statements was built automatically from grammar specification files using a set of tools known as AlexandHappy, and they were generated from grammar specification files. Here is an example of a contextfree grammar that describes the language that this parser is capable of understanding: E int E + E  E – E  E * E  E int E int E + E  E – E  E int E int E int E int E int E int
 E int
 E int
 E int
 For example, the expression(2+3)*4 will be processed into the following tree when it is evaluated: Among the datavalue constructors used to create or pattern match against an expression tree are EInt, EAdd, ESub, andEMul, which are all datavalue constructors.
 Last line of Exprdefinition states that we want to be able convert expressions to strings and compare them using the builtin recursive definitions of Haskell.
 This will be accomplished through the development of functions that recurse through an expression tree depending on data patterns.
 It takes a tree and matches it against one of four distinct patterns that are conceivable using the value constructors, delivering a new kind of string for each pattern it is matched against.
 It is necessary to provide an expression tree as the function’s input, and you must provide the output of the function for each pattern that might be matched against the input tree.
 The functions that you must implement are described in further detail below.
You should consider what the definition of each function implies in terms of eachExprpattern while writing your code. Due to the lack of “abstract” classes in this version, you will need to define patterns for each value constructor, as opposed to the Ruby implementation.
 When a mathematical expression is evaluated, the function Eval: ExprInt calculates the outcome of the evaluation. It is recommended that all operations be performed using integer arithmetic. count Expr Int is a function that counts the total number of arithmetic operations included in an expression. For this method, all three operations (addition, subtraction, and multiplication) are taken into consideration. expressiontreeheight: The Expr Int function calculates the height of an expression tree, where the height of a singlenode tree is defined as one
 Expr String is used as a postfix. This function returns a postfixstring representation that has been flattened. For example, the notation for (2+3)*4 would be “2 3 + 4 *” in postfix notation. When converting numbers to strings, you should make advantage of the showfunction. uniqInts: Expr – Retrieve a sorted list of all unique integers contained within an expression using uniqInts: Expr. A single instance of each number should exist in the resultant list
You might find it useful to build two helper functions for the last function (uniqInts), which are as follows:
 Uniq: Eq t = Returns a duplicate of the supplied list that has been purged of duplicates
 Ordered copy of the specified list is returned by the sort command: Ord t.
A copy of the supplied list, with duplicates deleted, is returned by Uniq: Eq t = Ordered duplicate of the specified list is returned by the sort command.
Submission
Your program must include the implementations that were previously mentioned. You must name your Haskell script fileP4.hs in order for it to run. You must include your name in the file as a remark at the start of the document. As is customary, breakdown your methods to make them more legible, give them descriptive names, appropriately indent them, and so forth. You will be scored somewhat on the readability of your code, but largely on whether or not it functions properly. ONLYP4.hsmust be sent to the corresponding assignment on Canvas by the due date.
Prolog Operator
 It is a function to act on a programming operand or variable, and it is represented by the prolog operator. In computer programming, the prolog operator is a symbolic character that may be used to perform arithmetic, logical, and comparison operations. When used in a programming language, it is a symbol for performing an action between two values or objects. The prolog operator is an expression that may be used to execute two or more than two values in any format, including arithmetic, logical, comparison, and others. The prolog operator is a symbolic function that is used to manipulate the value of the “pl” file in the console. This operator operates on files variables, objects, and a given operand
 It is a prolog console function that operates on the prolog console.
Prolog Operator Types
 This operator does arithmetic, logic, comparison, and other operations
 It is represented by the letter P. The prolog operator classifies a number of operators into groups that perform distinct tasks. The types of it, as well as its subcategories, are listed below.
Prolog Arithmetic operator
Arithmetic expressions such as addition, subtraction, and other similar operations are supported by this operator. The several types of arithmetic operators are listed here.
 The addition (+) and subtraction () operators, the multiplication (*) operator, the division (percent) operator, the power (**) operator, and the integer division (//) operator are all examples of mathematical operators. The modulus (mod) operator is used. The square root (sqrt) operator and the maximum (max) operator are both used.
Prolog Comparison operator:
 This operator is used for doing comparisons between two operands and variables, such as if they are equal.
The several sorts of comparison operators are listed below.
 Operator is more than ()operator
 Operator is less than ()operator more than or less than the (=) operator
 Greater than or less than the (=) operator The equal (=:=) operator is used to compare two things that are equal. The not equal (=) operator is used.
Trigonometric operator: This operator is used to find tangent and cotangent values for both the operating operand and the variable under consideration. The several types of trigonometric operators are illustrated in the table below.
Explain Operator Types with Example
Examples of arithmetic operator types are shown in the next section.
Prolog Arithmetic operator:
The addition (+) operator is as follows:
 This operator is used for the addition operation, as demonstrated in the example below.
As an illustration ? – The sum of 45 and 12 is ADD. The following is the output of the subtraction () operator:
 When performing a subtraction operation, this operator is employed
 An illustration of a subtraction operation is shown below.
When performing a subtraction operation, this operator is employed; an illustration of a subtraction operation is shown below.
 In the multiplication operation, this operator is used
 An example of a multiplication operation is shown in the next section.
As an illustration ? – MUL is calculated as 45 * 12. The following is the output of the division (/) operator:
 This operator is used for division operations, as seen in the division operation example below.
As an illustration ? – The division is 45/12. Output: Operator with a lot of power (**):
 This operator is used for power operation
 An example of power operation is shown in the next section.
? POW is 12 ** 2. Output: ? POW is 12 2. Integer division (//) operator: POW is 12 2.
 This operator is used for number division operations
 An example of an integer division operation is shown in the next section.
As an illustration ? – The IntDiv value is 45 / 12. Modulus (mod) operator: The output of the modulus (mod) operator is
 This operator is used for the division of the operation for the reminder
 The following is an illustration of the modulus operation:
As an illustration ? – The modifier is 45 mod 12. Output: The square root (sqrt) operator is defined as follows:
 Using this operator, you may get the square root of a number or expression. The following is an example of the square root operation:
For example, if R is 144 and S is sqrt (R). Maximum (max) operator: output: maximum (max) operator: This operator is used to get the maximum of two numbers by combining them together. The following is an example of the max operator. For example ? R is 45, S is 48, and T is the maximum (R, S). Output:
Prolog comparison operator:
Examples of several comparison operator types are shown below. The greater than () operator is used to compare two numbers.
 In the “greater than” value operation, this operator is used to compare two variables with each other. The following is an example of the greater than () operator
In the “greater than” value operation, this operator is used to compare two variables with one another. The following is an example of the greater than () operator.
 To compare two variables using the “less than” value operation, you may use this operator. The following is an example of the less than () operator
In Example 1, the output is ? 12 + 1313 * 2. In Example 2, the output is: ? 13 * 212 + 13. .Output:
Greater than equal to (=) operator
 As an example, consider the following: Example 1 ? 12 + 1313 * 2. As an example, consider the following: .Output:
? 12 + 1313 * 2. Output: ? 13 * 212 + 13 .Output:
Less than equal to (=) operator
 This operator is used to compare the values of two variables using the “less than and equal to” value operation. The following is an example of the less than (=) operator
As an example, consider the following: Example 1 ? 12 + 13 =13 * 2.
As an example, consider the following: Example 3 ? 12 + 13 =13 + 12 ? 12 + 13 =13 + 12 ? 12 + 13 =13 + 12 . Final result:
Equal (=:=) operator
This operator is used for comparing two variables in order to perform the “equal to” value comparison operation. The following is an example of the Equal (=:=) operator. Example 1 ? 12 plus 13 equals:= 13 plus 12 Output: Example 2 ? 12 plus 13 equals:= 13 plus 14. Output:
Not equal (==) operator
 Using this operator, you may do a “not equal to” value comparison between two variables
 The following is an example of the Not equal (=) operator.
Example 1 ? 12 + 13 = 13 + 12. Output:Example 2 ? 12 + 13 = 13 + 14. Output:Example 3 ? 12 + 13 = 13 + 14.
Prolog trigonometric operator:
Examples of trigonometric operator types are shown in the next section. The sin() function is an operator.
 In trigonometry, this operator is used to compute the tangent of a trigonometric pattern. An example of the sin operator is shown below.
Example 2 ? R is 45, and S is the sine of (R). The cos() operation produces an output.
 A common application for this operator is in determining the angle of congruence between two trigonometric patterns
 The COS() operator example follows.
Example 2 ? R is 45 degrees, S is cosine of (R). Output:
Conclusion
 The prolog operator is useful when dealing with a large number of variables and objects. The arithmetic, comparison, trigonometric, and logical operations are performed with the help of the prolog operator. This operator simplifies, makes the program more userfriendly, and makes it more elegant.
Recommended Articles
This document serves as a guide to the Prolog operator. In this section, we will explore the Definition, the Different Types of Prolog Operators, and the Code Implementation for each. You may also want to take a look at the following articles for further information:
 The C++ operator=(), the SQL NOT Operator, the unary operators in JavaScript, and the OpenCV sobel operator() are all examples of operators.