Solved

# Programs that read in the radius of a circle and prints the circle diameter....

Posted on 2006-06-24
577 Views
Hai there...i need to write a program that reads in the radius of a circle and prints the circle diameter,circumference and area. The constant value is 3.14159 for pie. For example if the user enter 5, then it will shows the result of

Diameter=10
Circumference=31.4159
Area=78.5397

Formula for the circumference and area of circle are C= 2 pie radius and A=pie radius^2
0
Question by:inzhagi
• 4

LVL 9

Accepted Solution

ID: 16976629
Okay ..i won't give a full code ..
but as i see in your description all you have to do is put what you descriped in small program ..
so first implement the *main* (inside it ask the user to enter the radius of a circle, then save it in a variable say; *Radius* of type double,integer, or float .. )
then add statements specific for each operation (circle diameter, circumeference, and area) ..
not that hard!!
Diameter is calculated by multiply the value by 2 ..
then declare a variable say; *Diatmeter* and assign to it the result of multipling the input value by two ..
then use *cout* function to show the result ..
and do so with others; declare variable and assign to it the result of the mathmatical process .. etc

e.g:

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

0

Author Comment

ID: 16977490
#include <iostream.h>
main()
{

const double pie = 3.14159;
double  r;
double  D;
double  C;
double  A;

cin >> r ;

D = 2*r;
C = 2*pie*r;
A = pie*r*r;

cout <<"Diameter:"<<D<<"D"<<endl;
cout <<"Circumference:"<<C<<"C"<<endl;
cout <<"Area:"<<A<<"A"<<endl;

return 0;

}

i get an error
0

LVL 9

Expert Comment

ID: 16978576
what kind of error ??
i ran the code and it give me the expected result !!!
0

LVL 25

Assisted Solution

InteractiveMind earned 50 total points
ID: 16978733
#include <iostream>
using namespace std;

int main()
{

const double pie = 3.14159;
double  r;
double  D;
double  C;
double  A;

cin >> r ;

D = 2*r;
C = 2*pie*r;
A = pie*r*r;

cout <<"Diameter:"<<D<<"D"<<endl;
cout <<"Circumference:"<<C<<"C"<<endl;
cout <<"Area:"<<A<<"A"<<endl;

return 0;

}
0

LVL 9

Expert Comment

ID: 17231143
Venabili ..

I tried to help him to accomplish his homework , and I think the asker respond to my comment and gave a full code for the solution .(I guess he followed the steps I provided in my first comment to write the code),BUT I think he solved the error after posting his code -THAT WHY HE DID NOT POST THE ERROR-.

0

LVL 9

Expert Comment

ID: 17258714
Well, Venabili ..
are you going to refund or accept an answer??
0

## Featured Post

This article will show you some of the more useful Standard Template Library (STL) algorithms through the use of working examples.  You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t…
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.