Variables and constants

In C programming, variables and constants are used to store and manipulate data during the execution of a program. However, there are some differences between variables and constants:

Variables:

A variable is a named storage location in memory that can hold a value.

The value stored in a variable can change during program execution.

Variables are declared using a specific data type, such as int, float, char, etc., which determines the size and type of data that can be stored.

Variables can be assigned a value using the assignment operator (=), and the value can be modified at any point in the program.

Variables need to be initialized before they can be used. Initialization is the process of assigning an initial value to a variable.

The value of a variable can be read, modified, and used in various calculations throughout the program.

Constants:

A constant is a value that cannot be modified during program execution.

Constants are used when you want to use fixed values that should not be changed.

Constants are declared using the const keyword.

Constants can be of any data type, such as int, float, char, etc.

Constants are usually named using uppercase letters to distinguish them from variables.