Microsoft's Interview question Compute(int x) function without loop , without temporary variable without goto,continue

#include<stdio.h>
int compute(int x)
{
    printf("%d ",x);
    if(x*2<20000)
    printf("%d ",compute(x<<1)>>1);
    return x;
    }
int main()
{
    compute(1);
    getch();
    return 0;
    }