c语言程序求答案和解析

Question

#include<stdio.h>
double f(double x,double y)
{if(x>=y)
return (x+y)/2.0;
else 
return f(f(x+2,y-1),f(x+1,y-2));
}
void main (){

printf ("%.1f",f(5.0,7.0));
}

Answer 1

应该是6.0