Constants in C are fixed values that cannot be modified after they are defined. They can be of various types, such as integers, floating-point numbers, characters, and strings, and can be defined using the keyword "const" or the #define preprocessor directive. It's also worth noting that the range of a constant can depend on whether it is signed or unsigned, and can vary depending on the number of bits used to represent the value. Additionally, when using constants with the "const" keyword, the compiler will perform type checking to ensure that the constant is used appropriately in the program, for example:
It is also possible to use the #define preprocessor directive to define constants in C. It is important to note that constants defined with #define are not type-checked by the compiler, and they are replaced by their values at preprocessing time.
For example:
The two main ways to define constants in C are by using the #define preprocessor directive and the const keyword.
The #define preprocessor directive is used to define constants by replacing the constant name with its value throughout the program. It is a simple way to define constants, but it does not perform type checking, and the values are replaced at preprocessing time. It is defined in the following format:
#define identifierName value
Where "identifierName" is the name given to the constant, and "value" is the value that is assigned to the identifierName. It is a simple way to define constants, but it does not perform type checking, and the values are replaced at preprocessing time.
The const keyword is used to define constants by declaring a variable as constant. The variable cannot be modified after it is defined, and the compiler will perform type checking to ensure that the constant is used appropriately in the program.
You are also correct that the values assigned to constants are referred to as literals. Literals are fixed values that cannot be modified during the execution of a program. They can be of various types, such as integers, floating-point numbers, characters, and strings.
