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 ðŸ˜‰

### Recommended posts

- Bitwise operator programming exercises index.
- C program to count trailing zeros in a binary number.
- C program to count leading zeros in a binary number.
- C program to rotate bits of a numberr.
- C program to convert decimal to binary number system using bitwise operator.
- C program to swap two numbers using bitwise operator.