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
    if (reg == 0) return 0;
    uint8_t ctr = 0;

    for (uint8_t x = 0; x < 8; x++)
    {
        if (reg & (1 << x)) ctr++;
    }
    return ctr;
}

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