34. Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    // Your code here
    unsigned int counter = 0;
    int mask = (1U << 0);
    while(reg){
        if(reg & mask)
            counter++;
        reg >>= 1;
    }
    return counter;;
}

int main() {
    uint8_t reg;
    scanf("%hhu", &reg);
    printf("%u", count_set_bits(reg));
    return 0;
}