C Variables

What Is Variables?

Generally, Variables are things which are all changable. We encounter several variables in our day-to-day life.

Example

• Time is variable which changes for every single seconds.
• Climate is variable which changes as per season.
• Rheostat is variable which changes to increase or to decrease circuit resistance.
• Speed is variable, either one can accelerate to increase the speed or decelerate to decrease the speed.

Variables in C

In C programming, variable is an identifier for a memory location for storing data. Once data is stored with a variable name, it can be retrieved by its variable name for various computations in a C program. A data that can be changed by assigning a new data to the variable. Variable can be numerical quantity or character constant.

Variable Purpose

Different operations can be performed using data stored in variables during program execution Such opereations are Addition, Subtraction, Mutiplication etc

A data can be accessed later in the program by simply referring the name of the variable.

Rules for declaring Variables

• Variable name should not be a C keyword.
• Variable must be declared before it can be used.
• Variable name should not be starts with a digit.
• Variable name may be a combination of UPPERCASE and lowercase. e.g.) firstName
• Variable name cannot be repeated within the same scope.
• A data type (int, float, char) is established when the variable is defined. Once defined the type of variable cannot be changed

Variables C Program

#include <stdio.h>
int main()
{
int number = 25;
int Number = 47;
printf("The number is %d ",number);
printf("\nThe Number is %d ",Number);
return 0;
}

Helpful Tips

• Variable can be declared at the start of block of code which is more helpful for later reference
• Variable name may be declared based on the meaning of the operation. e.g.) result, average, sum etc.

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