C++ Program: Write a program that takes its input from a file of numbers of type

Question

C++ Program: Write a program that takes its input from a file of numbers of type double, ouputs the largest number found in the file and the average of the numbers in the file to a file. The file contains nothing but numbers of type double seperates by blanks and/or line breaks. You will need to create one or more test files in to test your program. Allow the user to repeat the operation.

Here's what I have so far and I'm stuck:

/* This program takes its input from a file of numbers of type double and outputs:
       - the largest number found in the file
       - the average of the numbers in the file to a file
   The file contains nothing but numbers of type double deperated by line breaks.
   Contains one or more test files to test the program & allows uer to repeat the operation. */

#include <iostream>
#include <fstream>       //for i/o stream
#include <iomanip>       //for setprecision

using namespace std;

//main function
int main()
{
   ifstream in_stream;
   ofstream out_stream;
  
   //variable declaration
   char filename[16];   //filename contains 15 or fewer characters
   int num;   //integers in the file
   int num_of_int;       //number of integers in the file
   double largest_int = 0;       //holds the largest number
   double avg_of_int = 0;       //holds the integer of all the integers

   //get the filename from the user
   cout << "Enter the filename: ";
   cin >> filename;

   //verify if the file exists
   in_stream.open("infile.txt");
   if (in_stream.fail())
   {
       cout << "Input file opening failed. ";
       exit(1);
   }
   out_stream.open("outfile.txt");
   if (out_stream.fail())
   {
       cout << "Output file opening failed. ";
   }

   //close the files
   in_stream.close();
   out_stream.close();
}

Example output: The largest number in the file is The average of all of the numbers in the file is 12.425 End program Above results are for the test file: 12.0 14.5 17.0 6.2

Explanation / Answer

#include <iostream>
#include <fstream> //for i/o stream
#include <iomanip>
#include<stdio.h>
#include<stdlib.h> //for setprecision
using namespace std;
//main function
int main()
{
ifstream in_stream;
ofstream out_stream;

//variable declaration
char filename[16]; //filename contains 15 or fewer characters
int num; //integers in the file
int num_of_int; //number of integers in the file
double largest_int = 0; //holds the largest number
double avg_of_int = 0; //holds the integer of all the integers
//get the filename from the user
cout <<"Enter the filename: ";
cin >> filename;
//verify if the file exists
in_stream.open(filename);
if (in_stream.fail())
{
cout << "Input file opening failed. ";
exit(1);
}
out_stream.open("outfile.txt");
if (out_stream.fail())
{
cout << "Output file opening failed. ";
}
double sum=0;
double d;
int counter=0;
while(!in_stream.eof())
{
in_stream>>d;
sum+=d;
if(d>largest_int)
largest_int=d;
counter++;
}
out_stream<<"The Largest number in the file is "<<largest_int;
out_stream<<" The average of all the numbers in the file is "<<sum/counter;
out_stream<<"nEnd program.";
//close the files
in_stream.close();
out_stream.close();
}

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