#include <iostream>
using namespace std;

/**
?* 定義模板函數swapNum
?* 實現功能：交換兩個數的位置
?*/
template <typename T,int a,int b>
void swap(T )
{
??? T temp = a;
??? a = b;
??? b = temp;
}

int main(void)
{
??? int x = 10;
??? int y = 20;
??? // 調用模板函數
??? swap<int>(x,y);
??????? cout << "x = " << x << endl;
??????? cout << "y = " << y << endl;
?return 0;
}