Count Set Bits in an Integer

Code

#include <stdio.h>

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

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

Solving Approach

Iterate over the number with a shifting mask. Increment the counter for each logical true.