Count Set Bits in an 8-bit Register

Code

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

uint8_t count_set_bits(uint8_t reg) {
    int dem;
    while(reg)
    {
        if((reg&1)==1)
        {
            dem++;
        }
        reg=reg>>1;
    }
    return dem;
}

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

Solving Approach