Question

Finish the class Matrix.h:

class Matrix
   
{
public:
    Matrix();                                           //default constructor
    ~Matrix();                                          //destructor
    Matrix(const Matrix &);                             //copy constror
    Matrix(int row, int col);                            
    Matrix operator+(const Matrix &)const;              //overload operator“+”
    Matrix& operator=(const Matrix &);                  //overload operator“=”
    Matrix transpose()const;                            //matrix transposition
    void display()const;                                //display the data   
private:
    int row;                                            //row
    int col;                                            //column
    int** mat;                                          //to save the matrix
};

//main.cpp

#include <iostream>
#include"Matrix.h"
using namespace std;
int main() {
int row, col;
cout << "input the row and the col for Matrix a, b" << endl;
cin >> row >> col;
Matrix a(row, col), b(row, col), c(a), d;
cout << endl << "Matrix a:" << endl;
a.display();
cout << endl << "Matrix b:" << endl;
b.display();
c = a + b;
cout << endl << "Matrix c = Matrix a + Matrix b :" << endl;
c.display();
cout << endl << "Matrix a transpose to Matrix d:" << endl;
d = a.transpose();
d.display();
return 0;
}

Answer 1

Matrix.h

#include<iostream>
using namespace std;
class Matrix
{
    private:
        int row;
        int col;
        int **mat;
    public:
       Matrix();
       ~Matrix();
       Matrix(const Matrix &);
       Matrix(int row,int col);
       Matrix operator + (const Matrix &)const;
       Matrix& operator = (const Matrix &);
           Matrix Transpose() const;
           void display() const;
           void input() const;
};
//default constructor it assign 10 to row and column
Matrix :: Matrix()
{
   row=10;
   col=10;
   int i;
   //allocate memory for row
       mat=new int*[10];
   //alocate memory for columns
   for(int i=0;i<10;i++)
   {
       mat[i]=new int[10];
   }
}
//Destructor
Matrix :: ~Matrix()
{
    delete mat;
}
//parameterized constructors
Matrix :: Matrix (const Matrix &m)
{
    int i,j;
    //assign row and column
    this->row = m.row;
    this->col = m.col;
    //allocate memory for row
mat=new int*[row];
    //alocate memory for columns
   for( i=0;i<row;i++)
   {
       mat[i]=new int[col];
   }
}
  
//parameterized constructor
Matrix :: Matrix(int r,int c)
{
   row=r;
   col=c;
       //allocate memory for row
   mat=new int*[row];
int i;
    //alocate memory for columns
   for(int i=0;i<row;i++)
   {
       mat[i]=new int[col];
   }
}
//input method
void Matrix :: input()const
{
    int i,j;
    cout<<endl<<"Enter"<<row*col<<" elements";
    for(i=0;i<row;i++)
    for(j=0;j<col;j++)
    cin>>mat[i][j];
}
//display method
void Matrix :: display()const
{
    int i,j;
    cout<<endl<<"Matrix elements : \n";
    for(i=0;i<row;i++)
    {
       for(j=0;j<col;j++)
    cout<<" "<<mat[i][j];
    cout<<endl;
       }
   
}
//operator overloading add two matrices
Matrix Matrix :: operator + (const Matrix &m)const
{
    int i,j;
    Matrix obj;
        obj.row=m.row;
        obj.col=m.col;
           
    for(i=0;i<m.row;i++)
    for(j=0;j<m.col;j++)
    obj.mat[i][j] = mat[i][j] + m.mat[i][j];
       
    return obj;
}
//assign a matrix to other
Matrix& Matrix :: operator = (const Matrix &m)
{
       int i,j;
        row=m.row;
        col=m.col;
       
    for(i=0;i<row;i++)
    for(j=0;j<col;j++)
    mat[i][j] = m.mat[i][j];
   
   return *this;
}
//transpose a matrix
Matrix Matrix :: Transpose() const
{
       int i,j;
    Matrix obj;
    obj.row=row;
    obj.col=col;
   
    for(i=0;i<row;i++)
    for(j=0;j<col;j++)
    obj.mat[i][j]=mat[j][i];
    return obj;
}

main.cpp

#include<iostream>
#include "matrix.h"
using namespace std;
   
    int main() {
int row, col;
cout << "input the row and the col for Matrix a, b" << endl;
cin >> row >> col;
Matrix a(row, col), b(row, col),c(a), d;
cout << endl << "Matrix a:" << endl;
a.input();
a.display();

cout << endl << "Matrix b:" << endl;
b.input();
b.display();

c = a+b;
cout << endl << "Matrix c = Matrix a + Matrix b :" << endl;
c.display();
cout << endl << "Matrix a transpose to Matrix d:" << endl;
d = a.Transpose();
d.display();
return 0;
}

OUTPUT