C++ Help!

[Osiris]

hello, im a c++ newbie and i want to write this code,
it looks as it should work but errors appear because
im declaring arrays with variables instead of real numbers
check it out:

#include<iostream.h>
void main()
{
int x;
cout<<"Enter a number for x:";
cin>>x;

int ary[x]; // the error is here
}

is there anyway i could make this work?

[linolium]

Hi Osiris, you can't declare an array with no specific value in it unless it is a pointer. Try this:

#include<iostream.h>
void main()
{
int x;
cout<<"Enter a number for x:";
cin>>x;

int *ary[x]; // the error is here
}

[Osiris]

thanx, but i have some more question, can be assigned numbers just as any variable would, or they have to point to a certain variable, and would it work the same for char's?


editted:
it still gives me an error

[CornedBee]

linoleums solution will only get you in trouble and doesn't work anyway because it doesn't remove the source of the problems.

You can't use a variable as the size specifier for an array. The solution is to allocate memory dynamically using the new operator. WARNING: dynamic memory allcation is a semi-advanced topic. If you are a real newbie you should do other things now.

Usage of new:

int main()
{
  int* ar = NULL;  // this will later point to the allocated memory
  int x;
  cin >> x;
  arr = new int[x];
  // Now you can use it.
  // The next line is extremely important!
  delete[] arr;  // do this when you're finished
 return 0;
}

You should not use dynamic memory until you know pointers well.

[DNA7433]

#include<vector> is really easy to use