Question

Use C++ for this program

   Define a Line Class.
   Constraint: Line must be in First Quadrant
               for X-Y Coordinate System.

   Create the following methods:
   1) Parameterized Constructor
   2) Horizontal Line Constructor
   3) Vertical Line Constructor
   4) Default Constructor  
   5) Compute Length of Line.

    TEST CASES: Find Length of Line

    (a) Point 1: (5,6) Point 2: (15,6)
  
    (b) Point 1: (7,8) Point 2: (7,20)

    (c) Point 1: (9,10) Point 2: (19,20)

    (d) Default Line of 10 units at (0,0).

A quick question, would this be put in a header file and called into a source file?

Answer 1

//Line Class

#include <bits/stdc++.h>
using namespace std;
  
class Line {
   private:
// x and y cordinates of two point Point1 and Point2
int xCordinate_Point1, yCordinate_Point1, xCordinate_Point2, yCordinate_Point2;
  
   public:
   // 1) Horizontal Constructor where cordinate of first points are parameters and length of line
   Line(int xCordinate_Point1,int yCordinate_Point1,int length){
      
       //CHECKING Line must be in first qudrant
       if(xCordinate_Point1 < 0 || yCordinate_Point1 < 0){
           cout<<"Line is Not in First Quadrant"<<endl;
       }
       else{
          // this keyword holds reference of current object
           this->xCordinate_Point1 = xCordinate_Point1;
           this->yCordinate_Point1 = yCordinate_Point1;
          // for second cordinate of horizontal line y cordinate remains same while for x length is added
          this->xCordinate_Point2 = xCordinate_Point1 + length;
           this->yCordinate_Point2 = yCordinate_Point1;
       }
      
   }
  
   // 2) Vertical Constructor where cordinate of first points are parameters and length of line
   /*Here one extra parameter is added just to differentite from Horizontal Constructor so
   that ambiguity can be removed and constructor can be overloaded in parameter vertical
   v is passed to indicate vertical */
   Line(int xCordinate_Point1,int yCordinate_Point1,int length,char vertical){
      
      //CHECKING Line must be in first qudrant
      if(xCordinate_Point1 < 0 || yCordinate_Point1 < 0){
           cout<<"Line is Not in First Quadrant"<<endl;
           return;
       }
       else{
          // this keyword holds reference of current object
          this->xCordinate_Point1 = xCordinate_Point1;
           this->yCordinate_Point1 = yCordinate_Point1;
          // for second cordinate of vertical line x cordinate remains same while for y length is added
          this->xCordinate_Point2 = xCordinate_Point1;
           this->yCordinate_Point2 = yCordinate_Point1+length;
       }
   }
  
  
   // 3) Parameterized Constructor where cordinates of points are parameters
   Line(int xCordinate_Point1,int yCordinate_Point1,int xCordinate_Point2,int yCordinate_Point2){
      
       //CHECKING Line must be in first qudrant
       if(xCordinate_Point1 < 0 || yCordinate_Point1 < 0 || xCordinate_Point2 < 0 || yCordinate_Point2 < 0){
           cout<<"Line is Not in First Quadrant"<<endl;
           return;
       }
      
      // this keyword holds reference of current object
      this->xCordinate_Point1 = xCordinate_Point1;
       this->yCordinate_Point1 = yCordinate_Point1;
       this->xCordinate_Point2 = xCordinate_Point2;
       this->yCordinate_Point2 = yCordinate_Point2;
   }
  
   /* 4) Default Constructor where cordinates of points are not passed and no initialisation so only
   object reference is created but object is not initialized*/
   Line(){
   }
  
   // 5) Compute length function
   double computeLength(){
  
       // this keyword holds reference of current object
       // using distance formulae distance = sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2))
       int x_difference = (this->xCordinate_Point1 - this->xCordinate_Point2);
       int y_difference = (this->yCordinate_Point1 - this->yCordinate_Point2);
       int square_sum = x_difference * x_difference + y_difference * y_difference;
       //taking square root
       return pow(square_sum,0.5);
   }
};
  
int main(){
   // creating line object and finding the distance between points
  
   // PART-(a)
   //Point 1: (5,6) Point 2: (15,6)
  
  
   Line *line1 = new Line(5,6,15,6);
   cout<<"Length between Point 1: (5,6) Point 2: (15,6) is "<<line1->computeLength()<<endl;
  
   // PART-(b)
   //Point 1: (7,8) Point 2: (7,20)
  
   Line *line2 = new Line(7,8,7,20);
   cout<<"Length between Point 1: (7,8) Point 2: (7,20) is "<<line2->computeLength()<<endl;
  
   // PART-(c)
   //Point 1: (9,10) Point 2: (19,20)
  
   Line *line3 = new Line(9,10,19,20);
   cout<<"Length between Point 1: (9,10) Point 2: (19,20) is "<<line3->computeLength()<<endl;
  
   // PART-(d)
   //Default Line of 10 units at (0,0).
  
   Line *line4 = new Line(0,0,10);
   cout<<"Default Line of 10 units at (0,0) is drawn"<<endl;
}

//OUTPUT TERMINAL

For Answer of Quick Question :

Yes It can be done as this class can be used in source file and required methods can be called from there.