Count Set Bits in an 8-bit Register

Code

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

uint8_t count_set_bits(uint8_t reg) 
{
    int count=0; 
    //Below is the optimal way of finding number of set bits without traversing 32 times.
    while(reg)
    {
        count++;
        reg=reg&(reg-1);
    }
    return count;
}

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

Solving Approach