Count Set Bits in an 8-bit Register

Code

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

uint8_t count_set_bits(uint8_t reg) {

  int c = 0;

  while (reg != 0) {

    if ((reg & 1) != 0) {
      c += 1;
    }

    reg >>= 1;
  }

  return c;
}

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

Solving Approach