使用模板函数实现 Swap( x， y )，函数功能为交换

#include <iostream.h>
 
template <typename T> void swap(T &x， T &y)
{
T z;
z = x;
x = y;
y = z;
}
 
void main()
{
int j = 1， k = 2;
double v = 3.0， w =
4.0;
cout << "j = " <<j <<
" k = " << k << endl;
cout << "v = " <<v <<
" w = " << w << endl;
swap(j，k);
//int
swap(v， w);
//double
cout << "After swap:" << endl;
cout << "j = " <<j <<
" k = " << k << endl;
cout << "v = " <<v <<
" w = " << w << endl;
}