30. Count Set Bits in an Integer

#include <stdio.h>
#include <stdint.h>

int countSetBits(unsigned int n) {
    // Write your code here
    unsigned int mask = 0x80000000;
    int count = 0;
    for(uint8_t x=0;x<32;x++)
    {
        if(n & mask)
        {
            count++;
        }   
        mask>>= 1;
    }
    return count;
}

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