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Program Discussion :: Bitwise Operator
Home > Programs > Bitwise Operator

14. Write an efficient program to swap the odd and even bits in an integer

Answer:

#include <stdio.h>
#include<iostream>
using namespace std;
 
unsigned int swapBits(unsigned int x)
{
    // Get all even bits of x
    unsigned int even_bits = x & 0xAAAAAAAA; 

    // Get all odd bits of x
    unsigned int odd_bits = x & 0x55555555; 

    even_bits >>= 1; // Right shift even bits
    odd_bits <<= 1; // Left shift odd bits

    return (even_bits | odd_bits); // Combine even and odd bits
}

// Driver program to test above function
int main()
{
    unsigned int x = 23; // 00010111

    // Output is 43 (00101011)
        cout<<swapBits(x);

    return 0;
}

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