C++ Function and matrix

[ireon]

I should write a function that returns a two-dimensional array. I used a dinamic allocation of memory:

#include <iostream>
#include "imagine.h"
#include "function1"
#include "functrion2"


using namespace std;


int main()
{
int s = 3;
int m=(sizeof(*A)/4);
int n=(sizeof(A)/4)/m;
int*matrix=NULL;
int*v=NULL;
int*v1=NULL;

matrix=(int*)calloc(n*m,sizeof(int));

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

    {

        for(j=0;j<m;j++)

        {

            *(matrix+i*m+j)=A[i][j];

        }

    }


a=&(A[0][0]);

v=function1(a,n,m,s);

v1=function2(v,n,m,s);

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

    {

        for(j=0;j<m;j++)

        {

            A[i][j]=*(v1+i*m+j);

        }

    }

return 0;

}

This code works if I call individually function1 or function2, but if I call both the functions it doesn't work and the result is wrong. How could I resolve the problem? Could I use an other method to return a two-dimensional array?

 

[weetabixharry]

Your post title states "C++", but your code is very much C-style. If you are using C++, you should consider using something like a vector, valarray, queue or deque. For example, consider this:

#include <vector>

...

vector<vector<int> > matrix;

This gives you a vector of vectors.

Also, I'm not sure what you intend to do in your code when you #include "function1" and #include "function2". This looks very strange to me and may not do what you think it does.