Homework & Coursework Questions

/*
  File: incircles.cpp
  Created by: James Selhorst
  Creation Date:09/14/12
  Synopsis:  This program reads in three circles and a query point 
  and reports which circles contain the query point.
*/

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
  double x1,y1,x2,y2,x3,y3,x4,y4,a,b,c,dx1,dy1,dx2,dy2,dx3,dy3; // Variable declarations


  
  
  cout<<"Enter x and y coordinates of circle A (2 values):";// prompt and read in circle A center coordinates
  cin>>x1>> y1;
  cout<<"Enter radius of circle A:"; // prompt and read in circle A radius
  cin>>a;
  cout<<"Enter x and y coordinates of circle B (2 values):"; // promt and read in circle B center coordinates
  cin>>x2>>y2;
  cout<<"Enter radius of circle B:"; // prompt and read in circle B radius
  cin>>b;
  cout<<"Enter x and y coordinates of circle C (2 values):"; // prompt and read in circle C center coordinates
  cin>>x3>>y3;
  cout<<"Enter radius of circle C:"; // prompt and read in circle C radius
  cin>>c;
  cout<<"Enter x and y coordinates of query point (2 values):"; // prompt and read in query point
  cin>>x4>>y4;

  dx1=(x4-x1);
  dy1=(y4-y1);
  dx2=(x4-x2);
  dy2=(y4-y2);
  dx3=(x4-x3);
  dy3=(y4-y3);

  if ((sqrt((dx1*dx1)+(dy1*dy1))<=a),(sqrt((dx2*dx2)+(dy2*dy2))<=b),(sqrt((dx3*dx3)=(dy3*dy3))<=c))
    {
      cout<<"Circles A B and C contain point ("<<x4<<","<<y4<<")."<<endl;
    }
  else if ((sqrt((dx1*dx1)+(dy1*dy1))>=a),(sqrt((dx2*dx2)+(dy2*dy2))<=b),(sqrt((dx3*dx3)=(dy3*dy3))<=c))
    {
      cout<<"Circles B and C contain point ("<<x4<<","<<y4<<")."<<endl;
    }
  else if ((sqrt((dx2*dx2)+(dy2*dy2))>=b),(sqrt((dx1*dx1)+(dy1*dy1))<=a),(sqrt((dx3*dx3)=(dy3*dy3))<=c))
    {
      cout<<"Circles A and C contain point ("<<x4<<","<<y4<<")."<<endl;
    }
  else if ((sqrt((dx3*dx3)=(dy3*dy3))>=c),(sqrt((dx1*dx1)+(dy1*dy1))<=a),(sqrt((dx2*dx2)+(dy2*dy2))<=b))
    {
      cout<<"Circles A and B contain point ("<<x4<<","<<y4<<")."<<endl;
    }
  else if ((sqrt((dx1*dx1)+(dy1*dy1))>=a),(sqrt((dx2*dx2)+(dy2*dy2))>=b),(sqrt((dx3*dx3)=(dy3*dy3))>=c))
    {
      cout<<"No circle contains points ("<<x4<<","<<y4<<")."<<endl;
    }
 else if ((sqrt((dx1*dx1)+(dy1*dy1))>=a),(sqrt((dx2*dx2)+(dy2*dy2))>=b),(sqrt((dx3*dx3)=(dy3*dy3))<=c))
   {
     cout<<"Circle C contains points ("<<x4<<","<<y4<<")."<<endl;
   }
 else if ((sqrt((dx1*dx1)+(dy1*dy1))>=a),(sqrt((dx3*dx3)=(dy3*dy3))>=c),(sqrt((dx2*dx2)+(dy2*dy2))<=b))
   {
     cout<<"Circle B contains points ("<<x4<<","<<y4<<")."<<endl;
   }
 else if ((sqrt((dx2*dx2)+(dy2*dy2))>=b),(sqrt((dx3*dx3)=(dy3*dy3))>=c),(sqrt((dx1*dx1)+(dy1*dy1))<=a))
   {
     cout<<"Circle A contains points ("<<x4<<","<<y4<<")."<<endl;   
   }
     


  // Determine location of query point relative to the circles

  return 0;
}

else if ((sqrt((dx2*dx2)+(dy2*dy2))>=b),(sqrt((dx3*dx3)=(dy3*dy3))>=c),(sqrt((dx1*dx1)+(dy1*dy1))<=a))

#include <math.h>

bool isequal(double a, double b, double accuracy)
{
        return(fabs(a-b)<=accuracy);
}

int main(void)
{
        double a=9.00001, b=9.00002;
        cout << "Equal to 0.00000001 precision? " << isequal(a, b,   0.00000001) <<endl;
        cout << "Equal to 0.0001 precision? " << isequal(a, b,   0.0001) << endl;
}