34. Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    int cnt = 0;
    for(int i=0; i<8; i++){
        uint8_t check = reg & 1U;
        if(check == 1){
            cnt++;
        }
        reg = (reg >> 1);
    }
    return cnt;
}

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