C-C++ Defining a variable

Before you use a variable, you have to define it.

Variable definition (sometimes also called a variable declaration) is nothing more than letting the compiler know you will need some memory space for your program data so it can reserve some.

• To define a variable, you only need to state its type, followed by a variable name.

Example

char mvExamScore;    // This is called variable definition

Variable initialization

First define the variable, then initialize it with a value.

Example

char mvExamScore;    // Variable definition
myExamScore = 25;    // Variable initialization

Example

char mvExamScore = 25;    // Other form of Variable definition