The maximum value of "unsigned long int" in C ++

Question

How do I know what is the maximum assignable value for a variable of type unsigned long int?

Answer 1

The obvious way would be to use std::numeric_limits<unsigned long>::max();

Answer 2

Another way to find out:

 unsigned long int i = (unsigned long int) -1; printf("%lu\n", i); 

Answer 3

In a simple way:

 unsigned long int i = -1; std::cout << i;