34. Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    uint8_t count =0;
    int mask = 0x01;
    if(reg == 0) return 0;
    for(int i = 0; i<8;i++)
    {
        if((reg & mask) > 0) count++;
        reg = (reg >> 1);
    }
    return count;
}

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