Day 19: Interfaces

逃离我推掉我的手 2022-02-25 00:57 199阅读 0赞

# 题目： #

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# C++: #

#include <stdio.h>
    #include <stdlib.h>
    #include <algorithm>
    #include <string>
    #include <math.h>
    #include <vector>
    #include <map>
    #include <stack>
    #include <queue>
    #include <exception>
    #include <stdexcept>
    #include <iostream>
    using namespace std;
    
    class AdvancedArithmetic {
    public:
        virtual int divisorSum(int n) = 0;   //纯虚函数
    };
    
    class Calculator :public AdvancedArithmetic {
    public:
        int divisorSum(int n) {              //在派生类中实现纯虚函数
    	int sum = 0;
    	for (int i = 1; i <= n; i++) {
    	    if (n % i == 0) {
    		sum += i;
    	    }
    	}
    	return sum;
        }
    };
    
    
    int main() {
        int n;
        cin >> n;
        AdvancedArithmetic *myCalculator = new Calculator(); //这里使用磨人的构造函数，对象需要使用指针类型
        int sum = myCalculator->divisorSum(n);
        cout << "I implemented: AdvancedArithmetic\n" << sum;
        system("pause");
        return 0;
    }

# python： #

class AdvancedArithmetic(object):
        def divisorSum(n):
            raise NotImplementedError
    
    class Calculator(AdvancedArithmetic):   //继承
        def divisorSum(self, n):            //覆盖基类的函数
            sum=0
            for i in range(1,n+1):
                if n % i == 0:
                    sum += i
            return sum
    
    
    n = int(input())
    my_calculator = Calculator()
    s = my_calculator.divisorSum(n)
    print("I implemented: " + type(my_calculator).__bases__[0].__name__) //输出基类的名称
    print(s)

# 总结： #

## C++： ##

纯虚函数，有纯虚函数的类是抽象类，抽象类不能实现纯虚函数，需要派生类来实现。

virtual int divisorSum(int n) = 0; //关键字virtual，并且后面写个0，不写0的为虚函数

## python： ##

类的继承，派生类覆盖基类的函数

class Calculator(AdvancedArithmetic):

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