a character enclosed by single quotes
a character enclosed in single quotation marks, such as 'x'
a constant that is enclosed in single quotes
a data item that your program will use in some way, and it can be either a single character or a character string such as the one in the earlier simple example
an integer constant consisting of a single character enclosed in single quotes (e
an integer, written as one character within single quotes, such as 'x'
a sequence of one or more characters enclosed in single quotes as in 'x'
a single byte, in this example, the ASCII value of m
a string of one or more characters within single quotes
A string of one or more alphanumeric characters enclosed in apostrophes. The delimiting apostrophes are not part of the value of the constant.