Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) 
{
    int lastBit = 0;
    int count = 0;
    for(int i = 0; i < 32; i++)
    {
        lastBit = (n >> i) & 0x01;
        if(lastBit == 1)
        {
            count = count+1;
            lastBit = 0;
        }
    }
    return count;
}

int main() {
    int n;
    scanf("%d", &n);
    printf("%d", countSetBits(n));
    return 0;
}

Solving Approach