Write a program that reads a stream of integers from a file and prints to the screen the range of integers in the file (i. e. [lowest, highest]). You should first prompt the user to provide the file name. You should then read all the integers from the file, keeping track of the lowest and highest values seen in the entire file, and only print out the range of values after the entire file has been read.

This question is answered using C++ programming language

#include <fstream>

#include<iostream>

using namespace std;

int main() {

  string fname;

  cout<<"Enter Filename: ";

  cin>>fname;

  int lowest = 0;

int highest = 0;

  ifstream ifs(fname);

  int x;

  while (ifs >> x){

  if(x < lowest){

   lowest= x;

  }

  if(x > highest) {

   highest = x;

  }

  }

  ifs.close();    

  for(int i = lowest; i<=highest;i++)

  {

   cout<<i<<" ";

  }

}

Explanation:

This line declares fname as string  

string fname;

This prompts user for filename

  cout<<"Enter Filename: ";

This gets filename

  cin>>fname;

This declares and initializes lowest to 0

      int lowest = 0;

This declares and initializes highest to 0

int highest = 0;

This defines the file using ifstream

  ifstream ifs(fname+".txt");

This declares x as integer. x is used to read integers in the file

  int x;

The following iteration will be repeated until there is no other integer to be read from the file

  while (ifs >> x){

This checks for lowest

  if(x < lowest){

   lowest= x;

  }

This checks for highest

  if(x > highest) {

   highest = x;

  }

  }

This closes the file. i.e. the file has been read

  ifs.close();    

The following iteration prints the range of values from lowest to highest

  for(int i = lowest; i<=highest;i++)  {

   cout<<i<<" ";

  }  

Please note that the filename must be entered with its extension

i think so.

by: nicholas