34. Count Set Bits in an 8-bit Register

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

uint8_t count_set_bits(uint8_t reg) {
    // Your code here
    uint8_t onecou=0;
    for (int i=0; i<=7; i++){
        if(reg & (0x1<<i)) onecou++;
    }
    
    return onecou;
}

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

Approach 1 mine: Traditional 

Approach 2: always check the lsb and right shift the register untill it becmes 0.