## Calculate the area of circle by C++ program.

Asked By 10 points N/A Posted on -

Write a C++ program to calculate the diameter, circumference and are of circle.

Program will take the radius from the user as input. Print all results.

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Answered By 0 points N/A #124174

## Calculate the area of circle by C++ program.

hi,

It is a very simple program and you should be able to solve it even if i provide you the algorithm. however as you have put the question,here is your required answer:

in order to find get the radius from the user first ,you need to declare the variable :

now you need to declare the rest of variables.
double PI = 3.14159;

double diametre;
double area;

double circumference;

in order to calculate the diametre:

in order to calculate the area:

in order to calculate the circumference:

```circumference = PI * (radius +radius)

Janet//
```

Answered By 0 points N/A #124175

## Calculate the area of circle by C++ program.

Following is the code for the program to calculate diameter , circumference , and area of circle.  The different steps of the program are explained with the comments ahead of the respective statement. The program can be best run on Turbo C , Visual Studio 2005 , 2008 , 2010 .

#include<iostream>

usingnamespacestd;

intmain()

{

doubler;

doubledia, cir , area =0.0;   // declare and initialize variables

doublepi  = 3.141592654;

cin>> r;                       // Take radius as input from user

dia = 2*r;                    // Calculate diameter

cir = 2*pi*r;                 // Calculate circumference

area = pi*r*r;                // Calculate area

// Print results on screen

cout<<"Diameter is: "<< dia<<endl;

cout<<"Cirumference is: "<<cir<<endl;

cout<<"Area is: "<<area<<endl;

return0;

}

In order to see the output of program check attachment

Regards

Faisal Rehman