The Suffixes of the integer literal indicates the type in which it is to be read.

These are represented in many ways according to their data types:

• int: No suffix is required because integer constant is by default assigned as an int data type.
• unsigned int: character u or U at the end of an integer constant.
• long int: character l or L at the end of an integer constant.
• unsigned long int: character ul or UL at the end of an integer constant.
• long long int: character ll or LL at the end of an integer constant.
• unsigned long long int: character ull or ULL at the end of an integer constant.