[c-prog] square, circle and triangle

[Robert Ryan]

I want to make a square, a circle and a triangle in C++
  do I start off with just making generalizations about a Shape and then get 
specific for each shape
   
  #include <iostream>
using namespace std;
class Shape {
double Diam = 0;
  double Circum1 = 0;
  double Circum2 = 0;
  double Circum3 = 0;
  }
  public Square extends Shape {
  double side = 5;
  Circum1 = 4*side;
  }
   
  public  Circle extends Shape {
  double radius = 5;
  double circumference = 0;
  Circum2 = PI r2;
  }
   
  public  Triangle extends Shape {
  double side = 5;
  Circum3 = l+l+l;
  }
   
  int main() {
Shape s s("Circle", "Square", "Triangle",  true);
cout << b.get_Circum1() <<endl;
cout << b.get_Circum2( ) << endl;
cout << b.get_Circum2( ) << endl;
}


 
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