
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.


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;
}