binary comparation

Is there any function in c++ to convert decimal number to binary number without using divide algorithm? I want to count different bits of binary format of 2 numbers. like diff(0,2) is 1 bit. or diff(3,15) is 2 bit. I want to write diff function. thanks


You can find the number of different bits by counting the bits in the xor of the two numbers. Something like this.

int count_bits(unsigned int n) {
    int result = 0;
    while(n) {
        result += 1;
        // Remove the lowest bit.
        n &= n - 1;
    return result;

int diff(unsigned int a, unsigned int b) {
    return count_bits(a ^ b);

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