Sicily 2710. 运算符重载

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本文介绍了一个C++程序示例，展示了如何使用类和成员函数实现数组的封装与基本操作，包括构造函数、析构函数、求和方法及前缀递增运算符重载等。该示例通过具体的实现方式帮助读者理解C++中类和运算符重载的概念。

基础加细节，无需多言。

Run Time: 0sec

Run Memory: 308KB

Code Length: 1170Bytes

Submit Time: 2011-06-19 21:10:36

// Problem#: 2710
// Submission#: 819075
// 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 University
#include <iostream>
using namespace std;

class numCal {
public:
    numCal(int a[], int s ) {
        arr = new int [ s ];
        for ( int i = 0; i < s; i++ )
            arr[ i ] = a[ i ];
        size = s;
    }
         
    numCal(const numCal& a) {
        arr = new int [ a.size ];
        for ( int i = 0; i < a.size; i++ )
            arr[ i ] = a.arr[ i ];
        size = a.size;
    }
         
    ~numCal() { delete [] arr; }
         
    int sum() {
        int total = 0;
        for ( int i = 0; i < size; i++ )
            total += arr[ i ];
        return total;
    }

    numCal& operator=(const numCal& a ) {
        arr = new int [ a.size ];
        for ( int i = 0; i < a.size; i++ )
            arr[ i ] = a.arr[ i ];
        size = a.size;
        return *this;
    }

    numCal& operator++() {
        for ( int i = 0; i < size; i++ )
            arr[ i ]++;
        return *this;
    }
          
    numCal operator++(int) {
        numCal keep = *this;
        for ( int i = 0; i < size; i++ )
            arr[ i ]++;
        return keep;
    }

private:
    int size;
    int *arr;
};