C program to flip all bits of a binary number

Categories C programming 2 mins read

Write a C program to input a number from user and flip all bits of the given number (in binary representation) using bitwise operator. How to flip all bits of a binary number using bitwise operator in C programming.

Example

Input

Input any number: 22

Output

Number after bits are flipped: -23 (in decimal)

Required knowledge

Bitwise operators, Data types, Variables and Expressions, Basic input/output

Logic to flip all bits of a number

Flipping a bit means toggling or inverting the current bit status. If the current bit is set i.e. 1 than invert it to 0 and vice versa.

To flip all bits of a binary number you can run loop from 0 to size of the integer and flip individual bit at a time. However, C language has given bitwise complement ~ operator for the purpose.

Bitwise complement ~ evaluates complement of the operand bit. It evaluate to 1 if corresponding bit of the operand is 0 otherwise evaluate to 0.

Therefore to flip all bits of a number say num, you can use ~num.

Program to flip all bits of a number

/**
 * C program to count flip all bits of a binary number using bitwise operator
 */

#include <stdio.h>

int main()
{
    int num, flippedNumber;

    /* Input number from user */
    printf("Enter any number: ");
    scanf("%d", &num);

    flippedNumber = ~num;

    printf("Original number = %d (in decimal)\n", num);
    printf("Number after bits are flipped = %d (in decimal)", flippedNumber);

    return 0;
}

Output

Enter any number: 22
Original number = 22 (in decimal)
Number after bits are flipped = -23 (in decimal)

Happy coding 😉