Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    unsigned int un = (unsigned int)n; // Cast to unsigned int
    int count = 0;
    while (un > 0) {
        if (un & 1) { // Check if the least significant bit is set
            count++;
        }
        un >>= 1; // Right shift to check the next bit
    }
    return count;
}

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

Solving Approach