When writing long integer literals or long long integer literals in C++ 11, you can use either an uppercase or lowercase L.

Question

Quizplus · Accepted Answer

Both uppercase and lowercase L can be used to indicate a long integer literal or long long integer literal. However, using lowercase L can be confusing as it can be easily mistaken for the number one (1). It is preferable to use an uppercase L to avoid confusion. Alternatively, you can use the suffixes "LL" for a long long integer literal and "L" for a long integer literal in order to make the code clearer.

When Writing Long Integer Literals or Long Long Integer Literals