Why these two programs behave in a different way?

Consider the following  two C language program snippet given below in the table:

Program 1	Program 2
char *getString() { char str[] = "Will I be printed?";  return str; } int main() { printf("%s", getString()); getchar(); }	char *getString() { char *str = "Nice test for strings"; return str; } int main() { printf("%s", getString()); getchar(); return 0; }

  why these two programs behave in a different way:

• The former prints garbage because str is a local array allocated on the stack which is destroyed after the stack frame for getString() is popped. 
• In the latter case, str is a pointer that points to a global data section, which does not get affected with pushing/popping off stack frames 
• There is no heap allocation in the second program. Strings are stored in the global read-only segment

For an in-depth understanding of these things, I'd suggest to read this book: Computer Systems: A Programmer's Perspective and this excellent course on MIT OCW on code optimization: Performance Engineering of Software Systems