What does the L at the end of a number do? [duplicate]

Question

I have this constant:

#define MAX_DATE  2958465L

What does the L mean in this sense?

Answer 1

It is a long integer literal.

Integer literals have a type of int by default; the L suffix gives it a type of long (Note that if the value cannot be represented by an int, then the literal will have a type of long even without the suffix).

Answer 2

In this scenario the Ldoes nothing.

The L after a number gives the constant the long type, but because in this scenario the constant is immediately assigned to an int variable nothing is changed.