34. Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    int i;
    int count_set_bits=0;
    for(i=7;i>=0;i--)
    {
        if(reg & (1<<i)&1)
        count_set_bits++;

    }
    return count_set_bits;
}

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