例9.14 聲明一個類模板，利用它分別實現兩個整數、浮點數和字符的比較，求出大數和小數。
#include <iostream>
using namespace std;
template<class numtype>                //定義類模板
class Compare
{public:
Compare(numtype a,numtype b)
{x=a;y=b;}
numtype max( )
{return (x>y)?x:y;}
numtype min( )
{return (x<y)?x:y;}
private:
numtype x,y;
};

int main( )
{Compare<int> cmp1(3,7);            //定義對象cmp1，用于兩個整數的比較
cout<<cmp1.max( )<<″ is the Maximum of two integer numbers.″<<endl;
cout<<cmp1.min( )<<″ is the Minimum of two integer numbers.″<<endl<<endl;
Compare<float> cmp2(45.78,93.6);   //定義對象cmp2，用于兩個浮點數的比較
cout<<cmp2.max( )<<″ is the Maximum of two float numbers.″<<endl;
cout<<cmp2.min( )<<″ is the Minimum of two float numbers.″<<endl<<endl;
Compare<char> cmp3(′a′,′A′);       //定義對象cmp3，用于兩個字符的比較
cout<<cmp3.max( )<<″ is the Maximum of two characters.″<<endl;
cout<<cmp3.min( )<<″ is the Minimum of two characters.″<<endl;
return 0;
}