Help with functions

[PatrickD]

Hi guys. I need to take the following code and create these functions for an assignment:

1. void ClearScreen (void) - to clear the screen

2. int LowScore (int Score) - receives the parameter score and
returns the smallest value it has received.
The function uses pass by value.

3. int HighScore (int& Score) - receives the a parameter score and
returns the largest value it has received.
The function uses pass by reference.

4. void Counter (int& Count) - increments a parameter counter by 1.
The function uses pass by reference.

5. float AverageScore (int Total, int Count)
- computes an average of total / count.
The function uses pass by value.
It returns an average.

6. void DisplayStatistics (int Low, int High, int Average, int Count)
- displays the following exam statistics:
a.) number of exams
b.) low score
c.) high score
d.) average score

and here is the code:

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
  // Constant 
  int const INPUT_END = -1;

  // Variable declarations
  double myInput;
  double myScoreTotal, myScoreHigh, myScoreLow, myScoreAverage;
  int myInputCount;

  // Initialize variables
  myScoreTotal = 0;
  myScoreHigh = 0;  // Set current high score
  myScoreLow = 100;  // Set current low score
  myInputCount = 0;

  // Display instructions
  cout << "Please enter either" << endl;
  cout << "1. an exam score, or " << endl;
  cout << "2. -1 to indicate that there are no additional scores." << endl;
  cout << endl;

  // Input loop
  do
  {
    cout << "Enter Exam Score: ";
    cin >> myInput;    

    if (myInput == INPUT_END) 
      break;

    if ((myInput > 100) || (myInput < 0))
    {
       cout << "Please enter a number between 0 and 100." << endl;
       continue;
    }

    // Increment totals
    myScoreTotal += myInput;

    // Increment total grades
    myInputCount++;

    // Check for high score
    if (myInput > myScoreHigh)
      myScoreHigh = myInput;

    // Check for low score
    if (myInput < myScoreLow)
      myScoreLow = myInput;

  }
  while (1);

   cout << "\033[2J\033[H";
   cout << "Exam Statistics" << endl;
   cout << endl;

   if (myInputCount == 0)
   {
     cout << "No scores were input!" << endl;
   }
   else
   {
     myScoreAverage = myScoreTotal / myInputCount;

     cout << "-----------------------------------------------" <<  endl;
     cout << "|   Number    |  High   |   Low   |  Average  |" <<   endl;
     cout << "|  of Exams   |  Score  |  Score  |   Score   |" << endl;
     cout << "-----------------------------------------------" <<   endl;
     cout << "|       "<< setw(3) << myInputCount;
     cout << "   |    " << setw(3) << myScoreHigh;
     cout << "  |    " << setw(3) << myScoreLow;
     cout << "  |  " << setw(6) << fixed << setprecision(2) << myScoreAverage << "   |" << endl;
     cout << "-----------------------------------------------" << endl;
  }

  return 0;
}

I basically just need to rewrite the code to use the functions. I really don't have any idea how to go about doing this. Can anyone help me out? I would greatly appreciate it. Thanks.

[LB]

1. http://www.cplusplus.com/forum/articles/10515/

2. I do not understand?

3. I do not understand?

4. Completely and Utterly Pointless, but the most simple to do.

5. Also very easy to do.


Which one do you need help on first?

[PatrickD]

Hi, thanks for the quick reply!

My instructor basically wants me to take the following code and replace the calculations with functions. so for example:

1. I think I figured this one out. The header file would be:

void ClearScreen (void);

and then and the end of the code would be:

void ClearScreen (void)   
{
   cout << "\033[2J\033[H";
}

and then I just change the code from this:

cout << "\033[2J\033[H";

to this:

ClearScreen();

as for the other 5, I have no idea how to go about this. Thanks.

[LB]

3 is pretty simple, you just have the parameter passed by reference and then do ++parameter inside the function. ;)

[PatrickD]

like this?

int HighScore (int& Score)

int HighScore (int& Score)
{
  if (myInput > myScoreHigh)
      myScoreHigh = myInput;
}

and replace

// Check for high score
    if (myInput > myScoreHigh)
      myScoreHigh = myInput;

with

HighScore();

Thanks for the help and sorry I'm such a noob lol

[LB]

Oops. I meant number 4. I have no idea on 2 and 3.