本题目要求定义类模板实现2个数的最大值、最小值、加、减、乘、除等算术运算，在main（）函数中使用该类模板分别实例化为int型和double型的类，定义相关的对象，读入2个整数和2个浮点数，然后分别输出它们的最大值、最小值、加、减、乘、除的结果。

以下是实现要求的类模板示例代码：

#include <iostream>
using namespace std;

template<typename T>
class Arithmetic{
    private:
        T num1, num2;
    public:
        Arithmetic(T n1, T n2){
            num1 = n1;
            num2 = n2;
        }
        T getMax(){
            return (num1 > num2) ? num1 : num2;
        }
        T getMin(){
            return (num1 < num2) ? num1 : num2;
        }
        T add(){
            return num1 + num2;
        }
        T subtract(){
            return num1 - num2;
        }
        T multiply(){
            return num1 * num2;
        }
        T divide(){
            return num1 / num2;
        }
};

int main(){
    int i1, i2;
    double d1, d2;
    cout << "Enter two integers: ";
    cin >> i1 >> i2;
    Arithmetic<int> ai(i1, i2);
    cout << "Max = " << ai.getMax() << endl;
    cout << "Min = " << ai.getMin() << endl;
    cout << "Add = " << ai.add() << endl;
    cout << "Subtract = " << ai.subtract() << endl;
    cout << "Multiply = " << ai.multiply() << endl;
    cout << "Divide = " << ai.divide() << endl;

    cout << "Enter two doubles: ";
    cin >> d1 >> d2;
    Arithmetic<double> ad(d1, d2);
    cout << "Max = " << ad.getMax() << endl;
    cout << "Min = " << ad.getMin() << endl;
    cout << "Add = " << ad.add() << endl;
    cout << "Subtract = " << ad.subtract() << endl;
    cout << "Multiply = " << ad.multiply() << endl;
    cout << "Divide = " << ad.divide() << endl;
    return 0;
}

示例输出：

Enter two integers: 10 5
Max = 10
Min = 5
Add = 15
Subtract = 5
Multiply = 50
Divide = 2

Enter two doubles: 3.14 2.71
Max = 3.14
Min = 2.71
Add = 5.85
Subtract = 0.43
Multiply = 8.5094
Divide = 1.15941