Understanding pointers and local scope [duplicate]

Answer 1

Change the first function to:

char* allocateMemory() 
{
    static char str[20] = "Hello world.";
    return str;
}

and see the difference.

And now explanation:

When you return address of local data (variable or array, does not matter - it is AUTOMATIC variables) you have a risk to lose data or make a mess in the memory. It was just a good luck that integer data was correct after the second function call. But if you return address of STATIC variables - no mistakes. Also you can allocate memory from HEAP for data and return address.