Variables and constants allow you to express and modify data in a variety of ways. Constants have fixed values, as their name implies. Variables, on the other hand, are placeholders for values that can be assigned and altered while the program is running.
Literals are constants that refer to fixed values that the program cannot change. Constants are separated into Integer Numerals, Floating-Point Numerals, Characters, Strings, and Boolean Values and can be of any of the basic data kinds.
After the closing parentheses of the argument list, add the const keyword to specify a constant member function. Both the declaration and the definition must use the const keyword.
Primary constants are integers, floating-point numbers, and characters. Secondary constants include arrays, structures, pointers, Enum, and other such objects.
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