dynamic multidimensional arrays

[nicolasfranck]

I tried to make a multidimensional array on the free store.

cout << "rows:";cin>>rows;
cout << "columns";cin>>columns;
string **a=0;
a=new string*[rows];
for(int i=0;i<rows;i++){a[i]=new string[columns];}
string **b=0;
b=new string*[rows];
for(int i=0;i<rows;i++){b[i]=new string[columns];}

The compiler doesn't complain, but the program crashed!
Can any one help?

[tition]

I tried your code (using std::string) and got no problem...

BTW, where do you delete the dynamically allocated memory?

[Bazzy]

The problem could be with the sizes ( rows and columns )

[nicolasfranck]

OOps, now I feel chicky...

I figured out that the code works fine when I remove these lines(fills the corner with zero's):

for(int i=0;i<rows;i++){b[i][0]="0";}
 for(int i=0;i<rows;i++){b[i][columns-1]="0";}
 for(int i=0;i<columns;i++){b[0][i]="0";}
  for(int i=0;i<columns;i++){b[rows][i]="0";}

I forgot to change "rows" to "rows -1", and so I got outside the array-boundaries.

Thanks anyway for your help