Sicily 2710. 运算符重载

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2710. 运算符重载

Constraints

Time Limit: 1 secs, Memory Limit: 256 MB , Framework Judge

Description

试补充完成类numCal的定义

(注意：所有运算符的重载都必须符合运算符原本的语义，比如++A是“先加后使用”)

class numCal {

public:

numCal(int [], int); // 构造函数，形参分别是整形数组、数组长度

numCal(const numCal&) //拷贝构造函数

~numCal(); // 析构函数，要完成释放内存的操作

int sum(); // 求动态数组arr中size个元素值和

numCal& operator=(const numCal&) //=运算符重载

numCal& operator++(); //前序++运算符重载，使得++A后，A.arr的每个元素值加1

(A为numCal类型的对象，下同)；

numCal operator++(int); //后序++运算符重载，使得A++后，A.arr的每个元素值加1。

//……

private:

int size; // 数组arr元素个数

int *arr; // 动态数组

};

Hint

你只需要提交类定义。

// Problem#: 2710// Submission#: 3375538// The source code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License// URI: http://creativecommons.org/licenses/by-nc-sa/3.0/// All Copyright reserved by Informatic Lab of Sun Yat-sen Universityclass numCal {public:    numCal(int a[], int n) {        if (n == 0) arr = NULL;        else arr = new int[n];        size = n;        for (int i = 0; i < size; i++) arr[i] = a[i];    }     numCal(const numCal & an) {        if (an.size == 0) arr = NULL;        else arr = new int[an.size];        size = an.size;        for (int i = 0; i < size; i++) arr[i] = an.arr[i];     }     ~numCal() {         if (arr) delete[] arr;         arr = NULL;         size = 0;     }     int sum() {         int s = 0;         for (int i = 0; i < size; i++) s += arr[i];         return s;     }     numCal & operator=(const numCal & an) {         if (arr) delete[] arr;         arr = NULL;         arr = new int[an.size];         size = an.size;         for (int i = 0; i < size; i++) arr[i] = an.arr[i];         return *this;     }     numCal& operator++() {         for (int i = 0; i < size; i++) arr[i]++;         return *this;     }     numCal operator++(int) {         numCal an(*this);         for (int i = 0; i < size; i++) arr[i]++;         return an;     }private:    int size;    int *arr;};

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