重载+运算符以添加2个多项式 [英] overload the + operator to add 2 polynomials

问题描述

我试图添加存储在二维数组中的两个多项式，第一行存储系数，第二行存储度。

我创建了一个重载+函数，但在这里我使用2D分配的内存数组，当函数被调用时崩溃。

**更新：现在运行，但结果是一些大的负数。

复制构造函数和重载= operator

  // overload + 
多项式多项式::运算符+ ）
 {
 
 maxExp = right.maxExp; 
 poly = new int * [maxExp]; 
 for（int i = 0; i  *（poly + i）= new int [2] 
 
多项式temp = * this; 
 
 for（int i = 0; i  {
 for（int j = 0; j <2; j ++）
 
 temp.poly [i] [j] = poly [i] [j] + right.poly [i] [j]; 
} 
} 
 return temp; 
} 
  

解决方案

最显着的是第一行：

  delete [] poly; 
  

销毁其中一个加号（ x 在 x + y ）。

编辑：我注意到您已经编辑了删除[] 。这不能解决这个问题，但会使情况变得更糟：你仍在覆盖被动语，但现在正在泄漏更多的记忆。

I'm trying to add two polynomials stored in a 2D array with the first rows store the coefficients and the second row store the degree.

I created a overloading + function but here I use 2D allocated memory array and it crashes when the function is called.

**Update: it runs now but the results are some big negative numbers

FYI, I have a copy constructor and an overloading = operator

// overload +
Polynomial Polynomial::operator+(const Polynomial &right)
{

    maxExp = right.maxExp;
    poly = new int *[maxExp];
    for (int i=0; i < maxExp; i++)
        *(poly + i) = new int[2]; 

    Polynomial temp = *this;

    for (int i=0; i < maxExp; i++)
    {
        for (int j=0; j < 2; j++)
        {
            temp.poly[i][j] = poly[i][j] + right.poly[i][j];
        }
    }
    return temp;
}

解决方案

There are multiple problems, but the most glaring one is that the very first line:

delete [] poly;

destroys one of the summands (the x in x + y). It also leaks memory, but at this point this is secondary.

edit: I notice that you've edited the delete[] out of your question. This doesn't fix the problem, but makes it worse: you're still overwriting the summand, but now are leaking even more memory.

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