Question

Please answer question in C++, thank you.

Read in name of input file. File will be formatted as below:

filename: triangles1.txt

3 4 5 7 7 7

For each line read in the 3 integer values as the 3 sides of a triangle and calculate the area and print on output line with two decimal points.

Answer 1

C++ CODE:

#include<iostream>
#include<fstream>
#include<cstdlib>
#include<iomanip>
#include<cmath>

using namespace std;

/* main function begins*/
int main()
{
  
   char filename[30];
  
   cout<<"Enter the filename: ";
   cin>>filename;
  
   /* opening the file */
   ifstream infile(filename);
  
   //variables to store the perimeter
   double perimeter;
   double p;
  
  
   if(infile.fail())
   {
       cout<<"ERROR: File not found";
   }

   //variables to store the integers
   int a, b,c;
  
       //reading line by line
       while (infile >> a >> b>> c)
       {

           //calculating the perimeter
            perimeter=a+b+c;
          
          
            p=perimeter/2;
          
            //calculating the area using heron's formula
            double area=sqrt(p*(p-a)*(p-b)*(p-c));
          
            //displaying the details
            cout<<"side 1: "<<a<<endl;
            cout<<"side 2: "<<b<<endl;
            cout<<"side 3: "<<c<<endl;
            cout<<"Area : "<<area<<fixed<<setprecision(2)<<endl;  
            cout<<"\n"<<endl;
          
  
       }
}

CONTENTS OF triangles.txt:

3 4 5 7 7 7
12 5 8

SCREENSHOT FOR OUTPUT:

Enter the filename: triangles.txt side 1: 3 side 2: 4 side 3: !5 Area: 6 side 1:7 side 2:'7 side 3:7 Area: 21.22 side 1: 12 side 2: 5 side 3: 8 Area: 14.52