Count Set Bits in an 8-bit Register

Code

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

uint8_t count_set_bits(uint8_t reg) {
    
    int index = 0;

    while (reg > 0)
    {
        if(reg & 1)
        {
            index ++;
        }
    reg = reg >> 1;
    }
    return index;
}

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

Solving Approach