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

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 Language. ```#include 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); }```