Logical-NOT Operator:  !

  • Article

The logical-negation (logical-NOT) operator produces the value 0 if its operand is true (nonzero) and the value 1 if its operand is false (0). The result has int type. The operand must be an integral, floating, or pointer value.

For more information, see logical-AND and logical-OR.

Example

In the following example, the variable EndOfJob is tested. If the value is 0, the condition is logically negated to become true (nonzero). If the value is 1, the condition is logically negated to become false (zero).

// Example of the logical-NOT operator
int EndOfJob = 0;   // 0 = not end of job, 1 = yes, end of job

if (!EndOfJob) {
   printf( "It's still not the end of job!");
}