Why can't I reuse the name of a dynamically-allocated array after I delete it in C++? -

so, giving examples of how use dynamically-allocated 2d arrays , send code following:

int size = 5; int* arr = new int[ size ]; for( int = 0; < size; i++ )     arr[ ] = i; delete[] arr;  size = 10; int* arr = new int[ size ]; for( int = size; > 0; i-- )     arr[ ] = i; delete[] arr; 

this gave me redefinition error, thought delete[] frees space in memory (and 'arr'). know how work around (new array name, don't delete[]/redefine), wondering what's going on gives error?

you might want try this:

int size = 5; int* arr = new int[ size ]; for( int = 0; < size; i++ )     arr[ ] = i; delete[] arr;  size = 10; arr = new int[ size ]; //<-- no int* here, need reassign for( int = size; > 0; i-- )     arr[ ] = i; delete[] arr; 

we indeed deallocating block of memory arr points to, doesn't mean removing int* arr. removed it's 'content'.

it's non assigned pointer again after delete it.