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
    uint8_t cnt = 0U;

    for (uint8_t i = 0U; i < 8; i++) {
        if (reg & (0x01 << i)) {
            cnt++;
        }
    }

    return cnt;
}

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