this code is about a matrix class , but there is an error init . if i compile it

Question

this code is about a matrix class , but there is an error init . if i compile it with Dev c++ complier it always indicate thiserror.


#include<iostream.h>
#include<conio.h>

using namespace std;

class matrix

{

int **m;

int row, col;

public:

matrix()

{

row=col=0;

m=NULL;

}

matrix(int r ,int c);

~matrix();

void getmatrix();

void showmatrix();

matrix(matrix &m2); //copy constructor

matrix& operator=(matrix &m2);

};

matrix::~matrix()

{

for(int i=0;i<row;i++)

delete m[i];

delete m;

}

matrix::matrix(int r ,int c)

{

row = r;

col = c;

m = new int*[row];

for(int i=0;i<row;i++)

m[i]=new int[col];

}

matrix::matrix(matrix &m2)

{

cout<<" Copy constructor invoked… ";

row = m2.row;

col = m2.col;

m = new int*[row];

for(int i=0;i<row;i++)

m[i]=new int[col];

for(i=0;i<row;i++)

for(int j=0;j<row;j++)

m[i][j]=m2.m[i][j];

}

matrix& matrix::operator=(matrix &m2)

{

cout<<" Assignment Operator Overloading… ";

row = m2.row;

col = m2.col;

m = new int*[row];

for(int i=0;i<row;i++)

m[i]=new int[col];

for(i=0;i<row;i++)

for(int j=0;j<row;j++)

m[i][j]=m2.m[i][j];

return *this;

}

void matrix::getmatrix()

{

for(int i=0;i<row;i++)

for(int j=0; j<col; j++)

cin>>m[i][j];

}

void matrix::showmatrix()

{

for(int i=0;i<row;i++)

{

for(int j=0;j<col;j++)

cout<<" "<<m[i][j];

cout<<" ";

}

}


int main()

{

int r,c;

clrscr();

cout<<" Enter rows and cols of the matrix… ";

cin>>r>>c;

matrix m1(r,c);

cout<<" Enter the matrix elements one by one…";

m1.getmatrix();

cout<<" Entered matrix is… ";

m1.showmatrix();

//invoking copy constructor

matrix m2=m1;

cout<<" Result of copy constructor is… ";

m2.showmatrix();

matrix m3;

m3=m1;

cout<<" Result of assignment operatoroverloading… ";

m3.showmatrix();

getch();

}

Explanation / Answer

please rate - thanks a couple of i s were out of scope. I've never gotten clrscr to work, I think its mycompiler.   the changes are inred #include #include using namespace std; class matrix { int **m; int row, col; public: matrix() { row=col=0; m=NULL; } matrix(int r ,int c); ~matrix(); void getmatrix(); void showmatrix(); matrix(matrix &m2); //copy constructor matrix& operator=(matrix &m2); }; matrix::~matrix() { for(int i=0;i

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