c++ - What does the "L" mean at the end of an integer literal?

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).