Following table shows all the logical operators supported by C language. Assume variable A holds 1 and variable B holds 0, then −
Operator | Description | Example |
---|---|---|
&& | Called Logical AND operator. If both the operands are non-zero, then the condition becomes true. | (A && B) is false. |
|| | Called Logical OR Operator. If any of the two operands is non-zero, then the condition becomes true. | (A || B) is true. |
! | Called Logical NOT Operator. It is used to reverse the logical state of its operand. If a condition is true, then Logical NOT operator will make it false. | !(A && B) is true. |
Try the following example to understand all the logical operators available in C −
#include <stdio.h> main() { int a = 5; int b = 20; int c ; if ( a && b ) { printf("Line 1 - Condition is true\n" ); } if ( a || b ) { printf("Line 2 - Condition is true\n" ); } /* lets change the value of a and b */ a = 0; b = 10; if ( a && b ) { printf("Line 3 - Condition is true\n" ); } else { printf("Line 3 - Condition is not true\n" ); } if ( !(a && b) ) { printf("Line 4 - Condition is true\n" ); } }
When you compile and execute the above program, it produces the following result −
Line 1 - Condition is true Line 2 - Condition is true Line 3 - Condition is not true Line 4 - Condition is true