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
    unsigned int count =0;
    unsigned int pre = reg;
    for(int i =0; i<=31;i++){
        (reg &= (1<<i))!=0? count++ : NULL;
        reg = pre;
    }
    return count;
    return 0;
}

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