C++ :: Untraceable Error In Code Involving Classes

I've written a c++ program that contains the following classes: class Shape, Circle, Ellipse, Rectangle, Triangle. All the classes are a subclass of class Shape. They syntax of their definition is fine, I see no visible errors. This is the code:

#include "graphics.h"
//#include <iostream>
using namespace std;
const float Pi = 3.141;

float distance (int x1, int y1, int x2, int y2) {

[Code] ....

Now when I declare a variable of each subclass in the main, I get an error on two of the classes.

int main () {
Circle a;
Rectangle b;
Ellipse d;
Triangle c;
int x1, y1;
float length;

[Code] .....

...And there's a bunch of similar if conditions. My compiler gives an error under b and d, i.e. the Rectangle object and the Ellipse object. The error is, "Expected a ';'" . I have quadruple checked every inch of my code and as far as I can tell, there are no missing semicolons. Where this ";" belongs ....