Homework 6
UCR CS10: Introduction to Computer Science
Winter Quarter 2004, Lecturer: Kris Miller

Due Wednesday, February 18 before 8:00pm by web turnin.

YOU MUST TURN THIS IN AS A .CPP, .CC, OR .C FILE. The turnin system will no
longer accept other types of files. Your file names should not have spaces
or non-alphanumeric characters. A good file name to use is hw4.cpp.

-------------------------------------------------------------------------------
Note: Collaboration policy for this homework assignment

Collaboration on this homework is strongly ENCOURAGED. The homework is intended
for practice, not assessment -- most people who turn in decent work should get
most if not all points for this assignment. Forming study groups is strongly 
encouraged. You shouldn't simply copy answers from any source -- each other,
the book, the web, other books, previous solutions, etc. But you can certainly
discuss how to solve the problems, look over each others solutions and help
"debug" them, compare answers and redo problems if you determine your answer is
wrong, and most importantly, explain concepts related to the problems and
solutions.
-------------------------------------------------------------------------------

1. Self-test Exercise #5-1 (Chapter 5, #1)
2. Self-test Exercise #5-2
3. Self-test Exercise #5-3
4. Self-test Exercise #5-4
5. Self-test Exercise #5-5
6. Self-test Exercise #5-7
7. Self-test Exercise #5-10

Self-test answers in back of chapter 5.



8. Write a program that takes 5 integer numbers from a file called in.txt and
   outputs the largest and smallest of those numbers to an output file called
   out.txt. If your input file had the numbers 1 3 8 5 2 inside, the output 
   file should look like this:

   Largest number is 8
   Smallest number is 1



#include<fstream>
#include<cstdlib>
#include<iostream>

using namespace std;

const int NUM_VALUES = 5;

void largeAndSmall(ifstream& fin, ofstream& fout);
//preconditions: fin and fout have been been declared and opened.
//               fin is attached to a file that has 5 integers.
//postconditions: The largest value and the smallest value in the input file
//                have been output to the output file.

int main()
{
  ifstream fin;
  ofstream fout;

  fin.open("in.txt");
  if (fin.fail())
    {
      cout << "Error opening input file\n";
      exit(1);
    }

  fout.open("out.txt");
  if (fout.fail())
    {
      cout << "Error opening output file\n";
      exit(1);
    }

  largeAndSmall(fin, fout);

  fin.close();
  fout.close();

  return 0;
}


void largeAndSmall(ifstream& fin, ofstream& fout)
{
  int next, smallest, largest, cnt = 1;

  // bring in first number from file
  fin >> next;

  // make smallest AND largest equal to that first number
  smallest = next;
  largest = next;

  // bring in rest of values in file
  while (cnt < NUM_VALUES)
    {
      fin >> next;

      if (next > largest)
	{
	  largest = next;
	}
      
      if (next < smallest)
	{
	  smallest = next;
	}
      
      cnt++;
    }

  fout << "Largest: " << largest << endl
       << "Smallest: " << smallest << endl;
}