Logical Operators in C
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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. |
Example
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
c_operators.htm
