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 reg1 = reg;
    uint8_t len = 0x00; 
    while (reg1 > 0) 
    { 
        if(reg1 & 1)
        {
            len++; 
        }
        reg1 = reg1 >> 1;   
    } 
    return len;
}

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