variable In Programing Langauge

In C langauge Variables

Variables is a memory locations in C programming language.

• We use variables to store data in memory for later use, and that values can be change.
  
• Values of the variables can be numeric or alphabetic.
  

There are some rules on choosing variable names

• Variable name can consist of Capital letters A-Z, lowercase letters a-z, digits 0-9, and the underscore character.
• The first character must be a letter or underscore.
  
• Blank spaces cannot be used in variable names.
  
• Special characters like #, $ are not allowed.
  
• C keywords can not be used as variable names.
  
• Variable names are case sensitive.
  

Variable Definition in C

Syntax:

type variable_name;

type variable_name, variable_name, variable_name;

Example:

/* variable definition and initialization */
int    width, height=5;
char   letter='A';
float  age, area;
double d;

/* actual initialization */

width = 10;
age = 26.5;