Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    size_t c = 0;
    for (size_t i = 0; i < sizeof(n) * 8; i++) {
        if (n & (1 << i)) c++;
    }
    return c;
}

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

Solving Approach