#include<stdio.h>
int fun2(int a,int b)
{
int c;
c=(a*b)%3;
return c;
}
int fun1(int a,int b)
{
    int c;
a+=a;
b+=b;
c=fun2(a,b);
return c*c;
}
main()
{
int x=11,y=19;
printf("%d\n",fun1(x,y));
}

这题要怎么理解?