Question

Consider again the triangle classification program with a slightly different specification: The program reads floating values from the standard input. The three values A, B, and C are interpreted as representing the lengths of the sides of a triangle. The program then prints a message to the standard output that states whether the triangle, if it can be formed, is scalene, isosceles, equilateral, or right angled. Determine the following for the above program: Part a: For the boundary condition A+B>Ccase (scalene triangle), identify test cases to verify the boundary. Part b: For the boundary condition A = C case (isosceles triangle), identify test cases to verify the boundary. Part c: For the boundary condition A = B = C case (equilateral triangle), identify test cases to verify the boundary. Part d: For the boundary condition A2 +B2 = C2 case (right-angle triangle), identify test cases to verify the boundary.

Answer 1

Please find my implementation in C++.

// Triangle.cpp : Defines the entry point for the console application.
//

//Include header file
//#include "stdafx.h"
#include<iostream>

//Add namespace
using namespace std;

//Declare the class
class Triangle
{
   //Declare variables
   float a, b, c;
public:
   //Declare the required member functions
   void input();
   void TriangleType();
};

//Method to check the type of the triangle
void Triangle::TriangleType()
{
   //Test case to check whether the triangle is equilateral
   if (a == b == c)
       cout << "\nTriangle is equilateral Triangle.\n";

   //Test case to check whether the triangle is isocles
   else if ((a == b) || (a == c) || (c == b))
       cout << "\nTriangle is isoceles Triangle.\n";

   //Test case to check whther the triangle is right angled triangle
   else if (((a * a) + (b*b) == c*c) || ((a * a) + (c * c) == b*b)
               || ((c * c) + (b * b) == a * a))
       cout << "Triangle is Right Angled Triangle.\n";

   //Test case to check whether we are unable to make a triangle
   else if (((a + b) < c) || (c + b) < a || (a + c) < b)
       cout << "\n These sides are unable to make a triangle. Pls try again.";

   //Test case to check the scalene triangle
   else
       cout << "\nTriangle is Scalene Triangle.\n";
}

//Method to take input
void Triangle::input()
{
   cout << "Enter the sides of the triangle.";
   cout<<"Values should be between 1 to 50:\n ";
   cout << "\na is : ";
   //Test case to take the positive input
   try
   {
       cin >> a;
       if (a < 0)
           throw a;
       else if (a > 50){
           cout << "\nPlease enter the value within 1-50 : ";
            cin >> a;
        }
   }
   //catch block to handle the exception
   catch (float num)
   {
       cout << "\nNegative numbers are not allowed.";
       cout<<"\nPls again enter the value : ";
       cin >> a;
   }
   cout << "\nb is : ";

   //Test case to take the positive input
   try
   {
       cin >> b;
       if (b < 0)
           throw b;
       else if (b > 50){
           cout << "\nPlease enter the value within 1-50 : ";
          cin >> b;
        }
   }
   //catch block to handle the exception
   catch (float num)
   {
       cout << "\nNegative numbers are not allowed.";
       cout<<"\n Pls again enter the value : ";
       cin >> b;
   }
   cout << "\nc is : ";

   //Test case to take the positive input
   try
   {
       cin >> c;
       if (c < 0)
           throw c;
       else if (c > 50){
           cout << "\nPlease enter the value within 1-50 : ";
            cin >> c;
          }
   }
   //catch block to handle the exception
   catch (float num)
   {
       cout << "\nNegative numbers are not allowed.\nPls again enter the value: ";
       cin >> c;
   }
}

//Define the main function
int main()
{
   //create object of the class
   Triangle ob;
   char ch;
   //start do-while loop
   do
   {
       //call the methods
       ob.input();
       ob.TriangleType();
       cout << "Do you want to continue (y/n):";
       cin >> ch;
   } while (ch != 'n');
   //pause the system for a while
   system("pause");
   return 0;
}

thirdweek thirdweek thirdweek g++ TriangleClassification.cpp thirdweek ./a.out Enter the sides of the triangle.Values should be between 1 to 50 a is:5 bis :6 cis :7 Triangle is Scalene Triangle Do you want to continue (y/n):y Enter the sides of the triangle.Values should be between 1 to 50: a is 3 b is4 cis:5 Triangle is Right Angled Triangle. Do you want to continue (y/n):n sh: pause: command not found → thirdweek