34. Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    int cnt=0;
    for (uint8_t i = 0 ; i<8;i++ ){
        
        if (reg & 0x1) cnt +=1;
        reg = reg >>1;

    }
    
    return cnt;
}

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