C语言基础 在程序中的序号处填上正确的内容

*psub
&x,&y
&s2
s1,s2

#include
int fun(int a,int b, int *psub)
{ int sum;
sum=a+b;
*psub=a-b;
return sum;
}
void main( )
{ int x,y,s1,s2;
scanf("%d%d", &x,&y);
s1=fun(x,y,&s2);
printf("sum=%d
sub=%d
", s1,s2);
}