Logical Operators in C | Logical AND in C | Logical Or in C | Logical NOT in C

Logical Operators in C | Logical AND in C | Logical Or in C | Logical NOT in C

There are three logical operators.



1. Logical AND in C (&&)

Logical AND (&&) is used to combine two relational expressions. If any input of this operator is 0, output will be 0.

Truth table for Logical AND operator

Input1 Input2 Output
0 0 0
0 1 0
1 0 0
1 1 1

Example

12 >4 && 12>5 = 1
12 >4 && 12<5 = 0
12 <4 && 12<5 = 0

2. Logical OR in C (||)

Logical OR operator || is used to combine two relational expressions. If any input of this operator is 1, output will be 1.

Truth table for Logical OR operator

Input1 Input2 Output
0 0 0
0 1 1
1 0 1
1 1 1

 Example

13 >4 || 12>5 = 1
13 >4 || 12<5 = 1
13 <4 || 12<5 = 0

3. Logical NOT in C (!)

Logical NOT (!) is used to reverse the output of a relational or logical expression.

Truth table for Logical NOT operator

Input Output
0 1
1 0

 Example

!(12 >4 && 12>5) = 0
!(12<5) = 1
!(12 <3 || 12<5) = 1

 

Program to demonstrate logical operators in C.
#include<stdio.h>
int  main()
{
int a,b,c;
a=10
b=3
printf(”\n%d”, (a>0 && b>0);  /*1*/
printf(”\n%d”, (a<0 && b>0);  /*1*/
printf(”\n%d”, (a>0 || b<0);  /*1*/
printf(”\n%d”, (a<0 && b<0);  /*1*/
printf(”\n%d”, !(a>0);  /*1*/
printf(”\n%d”, !(a<0 && b>0);  /*1*/
getch();
return (0);
}

 

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Lesson tags: C Operators, logical and in c, logical not in c, logical opearots of c, logical or in c
Back to: C Programming Language
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