C NOT

C NOT Logical Operator

C NOT Logical Operator is used to inverse the result of a boolean value or an expression. ! is the symbol used for NOT Logical Operator in C programming.

C NOT Operator takes only one boolean value as operand and returns the result of NOT operation.

!operand

Truth Table

The following is truth table for NOT Logical Operator.

Operand	Returns
true	0
false	1

Examples

In the following program, we demonstrate the result of NOT logical operator (!) with a boolean value.

main.c

#include <stdio.h>
#include <stdbool.h>

int main() {
    bool x, result;
    x = true;
    //NOT Operation
    result = !x;
    printf("!true : %d\n", result);
}

Output

!true : 0
Program ended with exit code: 0

If you are using bool keyword in the program, include stdbool.h library.

In the following program, we demonstrate how to use NOT logical operator in an If condition.

main.c

#include <stdio.h>

int main() {
    int x = 7;
    if (!(x % 2 == 0)) {
        printf("%d is odd number.\n", x);
    }
}

Output

7 is odd number.
Program ended with exit code: 0

Conclusion

In this C Tutorial, we learned what C NOT Logical Operator is, and how to use it with conditional expressions in C programming.