Count Set Bits in an 8-bit Register

Code

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

uint8_t count_set_bits(uint8_t reg) {
    int c=0;
    for(int i=7;i>=0;i--){
        uint8_t a=0;
        a=1&(reg>>i);
        if(a==1) c++;
}return c;}

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

Solving Approach