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.

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!operand

Truth Table

The following is truth table for NOT Logical Operator.

OperandReturns
true0
false1

Examples

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

main.c

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#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

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#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.