Count Set Bits in an 8-bit Register

Code

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

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

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

Solving Approach