C Variables

In simple words, variable is a name given to memory box with a name, where we can “store” some value. Its value can be changed depending upon conditions and it can be reused many times.

• A variable can support different type of data such as integer, float, character etc
• Value of variables can be changed according to the information passed to the program.
• You can perform different set of operation to the variables.

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Rules for naming C Variable

• A Variable name must begin with letter or underscore.
• Variables are case sensitive
• You can use letters & digits in variable names.
• No special symbols can be used other than underscore.
• sum, city, person_2, _value are some examples for Variable name

Characters allowed in C variable name:

You can use Underscore(_), Capital Letters ( A – Z ), Small Letters ( a – z ) and Digits ( 0 – 9 ) while choosing a variable name. Blanks, Commas and other special symbols are not allowed in variable naming. Variable name Should not be Reserved Word.

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Example of Valid or Invalid Variable Names

These are some of the examples of valid variable names for city

• city
• City
• City1
• _City
• my_city
• city_1
• city_of_person
• status_flag
• _city1

Invalid Variable Names

• 1city
• 1_city
• city 1

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Declaring & initializing C Variable

• First, you need to declare a variable in the C program before to use it.
• Memory space is not created for a variable during a declaration. It happens only on the variable definitions.
• Variable initialization assigs a value to the variable.

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S.No	Type	Syntax	Example
1.	Variable declaration	data_type variable_name;	int x, y, z; char ch;
2.	Variable initialization	data_type variable_name = value;	int x = 10, y = 20; ch=’l’;

Example of Variable in C Programming

Here is the simple example of C Variable:

#include<stdio.h>
int main()
{
	/* Variable declaration */
	int num;
	/* Variable initialization */
	num = 10;
	/* print value of a variable */ printf("Number is: %d \n", num); 
	return 0;
}

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