30. Count Set Bits in an Integer

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int length = sizeof(n) * 8;
    int value = 0;
    // n negaitve

    for ( int i =0 ; i < length; i++){
        if ( (n & ( 1<<i)))
        value++;
    }
    return value;
}

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