how can we make resize function for Matrix2 Class in c++ ?

[Nabeel Nazir]

How can we write resize function for Matrix2 class;
where this function need to use Protected data members of matrix1 class?
Only setters are available in Matrix 1 class but there is no getter function in Matrix1 class !

class Matrix1
{
 
Protected:
int ** data;
int row,col;
Public:
 
};
Class Matrix2 : Public Matrix
{
Public:
Matrix2()
{
 
}
void resize()
{
//??????
}
 
};
 

[weaknessforcats]

First you allocate memory for the new size, then copy the current array into the new allocation, then delete the original allocation.

You have to use heap memory for this.

The code sample posted is full of coding errors plus data** is not a pointer to a 2 dimensional array. C++ has only one dimensional arrays.

Read this: http://bytes.com/topic/c/insights/77...rrays-revealed

[Nabeel Nazir]

Not a good answer ! 2-d arrays are exist in c++ !

[weaknessforcats]

In both C an C++ you can only declare arrays of one dimension. That is, you cannot create this array:

int array[x][y];

You can only create:

int array[4][y];

This is a one dimensional array of y elements where each element is a one dimensional array of 4 int.