how to delete the array in c++

Like this:

If you declared it on the stack: int a[5], you can not delete it; its memory will be freed when it falls out of scope. Read this.

Quote: Like this: Expand|Select|Wrap|Line Numbers a = new int[5]; // Declare an array delete [] a;   // Delete an array a = 0;      // Clear a to prevent using invalid memory reference If you declared it on the stack: int a[5], you can not delete it; its memory will be freed when it falls out of scope. Read this.

i have decleared it in this way position = new int [300]
it is displaying undecleard position. what is wrong?..

You are assigning something to position without having declared it yet. Since position is a pointer to an int, you should declare it as such before using it: int * position;
If a is not declared yet, line 1 should read: int * a = new int[5];