C++入门 实在想不通 没在论坛找到求大佬帮忙

补充ｓｗａｐ的形参
#include
using namespace std;

void swap(
// 在此处补充你的代码
)
{
int * tmp = a;
a = b;
b = tmp;
}
int main()
{
int a = 3,b = 5;
int * pa = & a;
int * pb = & b;
swap(pa,pb);
cout << pa << "," << * pb;
return 0;
}***