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 OneCnt = 0;
   
    for(int index=0;index<8;index++)
    {
        if((reg >> index)&1)
          OneCnt++;
    }
    return OneCnt;
}

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

Solving Approach