Count Set Bits in an 8-bit Register

Code

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

uint8_t count_set_bits(uint8_t reg) {

    uint8_t count = 0;

    for (uint8_t i = 0; i < 8*sizeof(reg); i++) {
        if (reg % 2) count++;
        reg >>= 1;
    }
    
    return count;
}

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

Solving Approach