Question

类别：

#include <string>
using namespace std;

class Matrix{
public:
float **grid;
Matrix(int r, int c);
friend istream& operator >>(istream& cin, Matrix & m );
void setMatrix();
void printMatrix();
friend ostream& operator <<(ostream& cout, Matrix & m);
private:
int row;
int column;

};

istream& operator >>(istream& cin, Matrix & m );
ostream& operator <<(ostream& cout, Matrix & m);

Matrix cpp

#include "Matrix.h"
#include <iostream>
#include <string>
using namespace std;

//First constructor
Matrix::Matrix(int r, int c){
row=r; // Row size
column=c; // Column Size
if(row>0 && column>0)
{
    grid = new float*[row]; // Creating 2d dynamic array
     for(int i=0; i<row;i++)
    grid[row] = new float [column];

    //Setting all elements to 0
    for(int i=0; i<row; i++)
    {
        for(int j =0; j<column; j++)
        {
            grid[i][j]=0;
        }


    }

}
else{
    cout<<"Invalid number of rows or columns!"<<endl;

}


}

//Setting values to the matrix

void Matrix::setMatrix()
{

for(int i=0; i<row; i++)
{
    for(int j=0;j<column;j++)
    {
        cin>>grid[i][j];
    }
}

}

//Print matrix
void Matrix::printMatrix()
{

for(int i=0;i<row;i++)
{
    for(int j=0; j<column; j++)
    {
        cout<<grid[i][j]<<" ";
    }

    cout<<endl;

}
}

//Istream function
istream& operator >>(istream& cin, Matrix & m)
{
    m.setMatrix();
    return cin;
}

//ostream function
ostream& operator>>(ostream& cout, Matrix & m)
{
    m.printMatrix();
    return cout;

}

主要功能

#include <iostream>
#include "Matrix.h"

using namespace std;

int main()
{
  Matrix m = Matrix(3,2);
  cout << m;
  return 0;
}

我正在尝试编写一个程序来执行不同的矩阵运算。这段代码应主要创建一个维度为3 * 2的矩阵，构造函数将其所有值初始化为0并打印矩阵。在编译时，我得到一个“链接器命令失败并退出1”错误，我真的不知道如何修复。我怎么能修这个呢？

错误：

架构x86_64的未定义符号： “operator＆lt;＆lt;（std :: __ 1 :: basic_ostream＆gt;＆amp;，Matrix＆amp;）”，引自： _main在main.o中 ld：找不到架构x86_64的符号 clang：错误：链接器命令失败，退出代码为1（使用-v查看调用）

Answer 1

您输错误码，更改运算符＆gt;＆gt;

之一

ostream& operator>>(ostream& cout, Matrix & m)
{
   m.printMatrix();
   return cout;
}

到

ostream& operator<<(ostream& cout, Matrix & m) {
   m.printMatrix();
   return cout;

}

Answer 2

还

    grid = new float*[row]; // Creating 2d dynamic array
    for (int i = 0; i<row; i++)
        grid[row] = new float[column];

应该是

    grid = new float*[row]; // Creating 2d dynamic array
    for (int i = 0; i<row; i++)
        grid[i] = new float[column];

矩阵运算C ++运算符重载程序错误

2 个答案: