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;

    while(reg > 0)
    {
        // This operation flips the rightmost set bit to 0
        reg &= (reg - 1);
        count++;
    }

    return count;
}

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