#include<iostream> using namespace std; template<class numtype> //定义类模板 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) ; //定义对象 cmp1，用于两个整数的比较 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) ; //定义对象 cmp2， 用于两个浮点数的比较 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' ); //定义对象 cmp3，用于两个字符的比较 cout<<cmp3.max()<<" is the Maximum of two characters. "<<endl; cout<<cmp3.min()<<" is the Minimum of two characters. "<<endl; return 0; }将它改写为在类模板外定义各成员函数。

#include<iostream>
using namespace std;

template<class numtype> //定义类模板
class Compare {
public:
    Compare (numtype a, numtype b) {x=a; y=b; }
    numtype max();
    numtype min();
private:
    numtype x,y ;
};

// 在类模板外定义各成员函数
template<class numtype>
numtype Compare<numtype>::max() {
    return (x > y) ? x : y;
}

template<class numtype>
numtype Compare<numtype>::min() {
    return (x < y) ? x : y;
}

int main () {
    Compare<int> cmp1(3, 7) ; //定义对象 cmp1，用于两个整数的比较
    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) ; //定义对象 cmp2， 用于两个浮点数的比较
    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' ); //定义对象 cmp3，用于两个字符的比较
    cout << cmp3.max() << " is the Maximum of two characters. " << endl;
    cout << cmp3.min() << " is the Minimum of two characters. " << endl;

    return 0;
}