Logical Operators in C language || Arthematic instruction in c

Logical Operators in C

In the previous series of C tutorial, we had known about Bitwise operators. In today's tutorial series, we will learn about Logical operators. When we had to compare two variables, constants or operands, we used Relational operators, but what would we do when we had to check more than one condition? Let us know in this tutorial series what to do when two or more conditions are to be compared?

What is logical operators?

Logical operators are used to compare two or more expressions or conditions. This operator combines two or more expressions and make it a condition.

In other words, this operator is used to perform logical operations.

Let us understand by example. - Suppose vacancy has come out in a company and for that vacancy minimum qualification Graduation is required and at the same time it is necessary to have 80% or more marks in Graduation, then now there will be a logic perform that will first check whether Candidates have Graduation qualification and if Graduation qualification then check if its mark is equal to or more than 80% if both the condition is true only then further process will be followed otherwise it will be sorted.

There is three type of Logical operators which is given in the table below.

operators	Name
&&	Logical and operator
||	Logical or operator
!	Logical not operator

Let’s study all operators one by one

What is ‘Logical and operator’ (&&)

This operator is used to check the output of two expressions. In this, if the output of both expressions is true then only it will return true otherwise False will return.

Behavior of && operator

Statement 1      &&	Statement 2	Result
False	False	False
True	False	False
True	True	True

For example

#include<stdio.h>

#include<conio.h>

Void main()

{

Int = y,x=5;

Clrscr();

Y=x>4&&x<10

Printf(“%d”,y);

getch();

}

Output

Output will be 1 which is true statement. It is because both statements are true and ‘&&’ operator combine both statement

 

What is “logical or operators (||)”?

This operator is called Logical OR operator. This operator is used to check the output of two expressions. In this, if one of the two expressions are output, it will return true, otherwise it will return False.

Behavior of && operator

 

Statement 1      ||	Statement 2	Result
False	False	False
False	True	True
True	True	True

 

It’s means if one statement is true then the out will be true.

If one statement is false and other statement is true the output will be true.

If both statements are false then the output will be false

For example

#include<stdio.h>

#include<conio.h>

Void main()

{

Int = y,x=5;

Clrscr();

Y=x>4||x<10

Printf(“%d”,y);

getch();

}

Output

Output will be 1 and it is true because both statements are true

 

What is “logical not operators (!)”?

This operator is called Logical NOT operator. This operator is used to reverse any logical state. If a condition is true, then the Logical NOT operator makes it false.

For example

#include<stdio.h>

#include<conio.h>

Void main()

{

Int = y,x=5;

Clrscr();

Y=!x>4

Printf(“%d”,y);

getch();

}

Output

Output will be 0 its means it is false statements. It is because, x is greater then 4 but we use logical not operator‘!’ so we get false as output.

If you understand the logical operators well in this post, then please comment and write yes or no. 

Thanks for reading this post

Also read

(https://grapsvs.blogspot.com/2020/05/arithmetic-instruction-in-c-part-12.html)

(https://grapsvs.blogspot.com/2020/05/Arithmetic-instruction-in-c-programmingpart%2013.html)