Programming PI

VisualC++6.0
This is for a Calculate the area of a circle given the diameter.

Ok this is what I have so far;
#include<math.h>
voidmain(void)
{
pie,diameter,areais,sqrt(2);

cout<<"Enter Pie ";
cin>>Pie;
cout<< "Enter Diameter ";
cin>>diameter;
cout<< "Enter Area Is ";
cin>>areais;
cout<< "EnterSquare(2) ";
cin>>sqrt(2)

pie *4Sqrt(2)


Do I have everything so far.

No.

To calculate the area, you only need input the diameter.

You've got cout and cin sorted, but you need to work on declarations and assignments

when i was at school PI * r*r gives the area of a circle. Given that r= 0.5*d this problem should be easy.

Code:

---


#include<iostream>

using namespace std;

int main() // not void main() cos thats illegal
{
const double PI= 3.14159 // you might have to check that value
cout<<"Enter diameter";
double diameter,radius;
cin>>diameter;
radius=diameter*0.5;
double area=radius*radius*PI;
cout<<endl<<"Area of circle is "<<area<<" units squared"<<endl;
return 0;
}

---