405a.cpp

C++实训教程

/*
	405a.cpp
	DEMO implement  Swap()  using function  template
*/

#include <iostream.h>
#include <string.h>
template  <class T> void Swap(T& a,T& b);
void Swap(char * a, char * b);
void main(void)
{
	long n1 = 1, n2 = 2;
	Swap(n1,n2);
	cout << n1 << "  " << n2 << endl;
	float f1 = 1.5, f2 = 2.5;
	Swap(f1,f2);
	cout << f1 << "  " << f2 << endl;
	char c1 = 'A', c2 = 'b';
	Swap(c1,c2);
	cout << c1 << "  " << c2 << endl;
	char  name1[20] = "Wang ", name2[20] = "Lee";
	Swap(name1,name2);
	cout << name1 << "  " << name2 << endl;
}

void Swap(char * a, char * b)
{
	char  temp[20] ;
	strcpy (temp,a);
	strcpy (a,b);
	strcpy (b,temp);
}

template  <class T> void Swap(T& a,T& b)
{	T temp=a;    a = b;	 b = temp;}
/*
2  1
2.5  1.5
b  A
Lee  Wang
*/