c语言 ？？？？？？

#include <stdio.h>

int count_bits(unsigned x)
{
    int bits = 0;
    while(x)
    {
        if(x & 1U)
            bits++;
        x >>= 1;
    }
    return bits;
}

int int_bits(void)
{
    return count_bits(~0U);
}

void print_bits(unsigned x)
{
    int i;
    for(i = int_bits() - 1; i >= 0; i--)
        putchar(((x >> i) & 1U) ? '1' : '0');
}

int main(void)
{
    unsigned x, n;
    
    printf("no minus integer: "); scanf("%u", &x);
    printf("unit of move: "); scanf("%u", &n);
    
    printf("
intetger = "); print_bits(x);
    printf("
left move = "); print_bits(x << n);
    printf("
right move = "); print_bits(x >> n);
    
    return 0;
}