Variables are often defined in programs to save and process data.

Essentially, variables represent a piece of operable memory, and variables can also be considered to be symbolic representations of memory. When a program needs to use memory, a variable of a certain type can be defined. At this time, the compiler allocates a certain size of memory space based on the data type of the variable. The program can access the corresponding memory through the variable name.

Extended information:

Variables can assign a short, easy-to-remember name to each piece of data to be used in the program. It is used to save the data entered by the user when the program is running, the results of specific operations, and a piece of data to be displayed on the form, etc. When defining and using variables, usually define the variable name to be easy to read and describe the purpose of the data contained, rather than using some difficult abbreviations.

Users can also create their own variables to store temporary data or result data during program execution, etc. If a variable is declared without a value, the compiler will automatically prompt and assign a default value.