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Hi all,

I would like to ask you all for some help.

I need to write a program that allows me to have a circle radius as input and then print out the diameter, circumference and area of that circle.

Easy task but i have to put the calculations in the output statement. can you tell me where i went wrong please?

Here is what i have got so far.

Thanks for answers.

```
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
int main()
{
const double PI = 3.14159;
double radius;
cout << "Please enter the radius: ";
cin >> radius;
double diameter;
double circumference;
double area;
cout << "The diameter is " <<double diameter = 2 * radius << endl; // have to write calculations in output statement
cout << "The circumference is " << double circumference = 2 * pi * radius << endl;
cout << "The area is " << double area = pi * radius * radius << endl;
return 0;
}
```