What happens when the number of possible virtual addresses are exceeded

Question

Suppose I'm writing a program for an environment that has 32 bits for virtual spaces addresses (4294967296 addresses), what happens if create more than 4294967296 variables, effectively exceeding the number of possible addresses? Or all programs in an environment collectively use over 4294967296 addresses?

Answer 1

It depends precisely how you try to do it. It may crash, it may return an error, it may throw an exception.