Variables in C Programming

Variables in C Programming

Variables in C Language

Variable is a location in memory where worth is often stored to be used by a program. Variables must be declared before they will give value. When declaring a variable, its name and data type should be specified. Variables have a name, type, and value.

The declaration allocates the storage location of the acceptable size and associates the name and data type with the correct location.

Variable Declaration in C

Format of a variable -

              <Data type><Name of the variable>

Example:

int num1; float num2; double num3; short num4; char fLetter;

Variable Names in C

 C variable naming rules

• A variable name can be a series of characters consisting of letters, digits, and underscores[ _ ]. 
• The variable name does not begin with a digit.
• A variable name may not contains embedded blank spaces.
• A variable name may not be a reserved word. [ int, return, char, while, if ]
• C language is a case-sensitive language. It's meaning is uppercase, and lowercase letters are different in C language.   [ name, Name, and NAME are three different variable names in c ]

valid variables and invalid variables in C programming