VARIABLE IN C++

A variable is a value that can change anytime . It is a memory location used to store a data value . variable name is case sensitive.

1. They must always begin with a letter , although some system permit underscore as the first character.
2. The length of a variable most not be more than 8 character.
3. white space is not allowed .
4. a variable should not be a keyword.
5. it should not contain any special characters.

example of invalid variable names are :

 

123 , (area) , -hello , %abc , etc.

A variable must be declared before it can be used . Variables can be declared at the start of any block of code .