Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    int temp;
    int count = 0;
    int i = 0;
    while(i<8){

    temp = (reg>>i)&1;
    if(temp == 1){
        count++;

    }
i++;
    }

    return count;
}

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