2d Array Problem.

**Drealoth** · 03-21-2003

Code:

#include <iostream.h>
#include <fstream.h>

int main ()
{
	
	ifstream fin ("gift1.in");
	ofstream fout ("gift1.out");
	int NP;
	fin >> NP;

	char strName[NP][15];
	
	int i;
	for (i = 0; i< NP;i++)
	{
		fin.getline(strName[i],20);
	}
	return 0;
}

Basically, what this program is supposed to do is input NP names, of length 1 to 14 from a text file. However, when I run the program, I get 3 errors on the line 'char strName[NP][15];' They are:
error C2057: expected constant expression
error C2466: cannot allocate an array of constant size 0
error C2133: 'strName' : unknown size

Thanks in advance for any help

{EDIT: The number input for NP is 5}

**Stoned_Coder** · 03-21-2003

an arrays size must be known at compile time. thats why its saying constant expected.
To do what you want at runtime you need to use dynamic memory allocation throgh the new/delete operators.

**CheesyMoo** · 03-21-2003

Here is an example of dynamic memory allocation using pointers:

Code:

int main()
{
    int NP;
    ....

    int *point;
    // Allocation memory
   point = new int[NP][15];

    ....


   // End of program
   delete point;
   return 0;
}

I hope I used proper syntax I'm tired.

**sikamikaniko** · 03-22-2003

You shoud declare the size of the array.

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