Variable

Variable In C Language

Variable is used to store data. Variable is the name of the memory location .

let's see the syntax of declaration of variable:

Syntax: variable_type variable_name

Example:

  

int y;

char ch;

float per;

In Above example int, char, float are the datatype and y, ch, per is the name of variable.

We can also provide value while we declare the varable as show below:

int y=10;

char ch='B';

float a=10.5, b=5.5;//Declaring 2 variable of float type

Rules of  Declaring The Variable:

1. Variable  can have only aphabate and unerscore.
2. Variable can not start with digit.
3. White space is not allowed while you declaring the variable.

Valid Variable Name:

Invalid Variable Name:

Types Of  Variable In C language:

1.Local Variable :

local variable declare inside of the function.

2.Global Variable:

 

A global variable declare outside of the function.

3.Static Variable:

Static means unchanged. A Variable declare with static keyword is called static variable.

C Programing Basic Programs

C Programing Basic Programs Using Printf() and Scanf()  Functions

Write a function called Area() Which is used to fined out are of triangel, square, circule. Use the concept of function overloading. Write a main function tha gets value from the user to test three function

#include<iostream.h>
#include<conio.h>

void area(float r)
{

float area;
area=3.65*r;
cout<<endl << "\tArea of Circule:"<<area;
}

void area(float h, float b)
{
float ans;
ans=h*b/2;
cout<<endl<<"\tArea Of Triangle:"<<ans;
}

void area(int no)
{
float ans;
ans=no*no;
cout<<endl<<"\tArea Of Square:"<<ans;
}

void main()
{
clrscr();
area(2.5f);
area(10,2.6f);
area(12);
getch();
}

• OUTPUT:

    Area Of Circule: 9.125

    Area Of Triangle: 13

    Area Of Square: 144