单选题

以下代码输出的是__? int foo(int x,int y) { if(x<=0||y<=0) return 1 return 3*foo(x-1,y/2) } cout<<foo(3,5)<<endl

Question

以下代码输出的是__?

int foo(int x,int y)
{
    if(x<=0||y<=0)  return 1
    return 3*foo(x-1,y/2)
}
cout<<foo(3,5)<<endl

A. 81

B. 27

C. 9

D. 3