~cpp
#include <iostream.h>
void swap(int *, int *);
void main()
{
int a = 1, b = 18;
cout << "a = " << a;
cout << "b = " << b << endl;
swap(&a,&b);
cout << " swap후 a = " << a;
cout << " swap후 b = " << b << endl;
}
void swap(int *n, int *m)
{
int save;
save = *n;
*n = *m;
*m = save;
}