// File: WhileBoolFlagFunctionsSentinel.CPP
// Sentinel Terminated; Functions with all Argument Types;
//						Boolean Flag; While Loop
// Find the Extremes in a List of integers
// Use a boolean flag to facilitate all data input into the program loop
// Method of Iteration: for loop
// Note that Data is always input directly before the sentinel is checked.

#include <iostream>
#define False 0
#define True  1
#define Sentinel -999

using namespace std;

// Read and Integer to Pass Back to the Caller
void GetInteger(int &);
// Update the Extremes if the Value Represents a New Extreme
void UpdateExtremes(int,int &,int &);
// Output the Results...Extremes or Message that No Data was Entered
void Report(int,int,int);

int main()
{int Value,Min,Max,ExtremesInit=False;
 // Get the First Value
 GetInteger(Value);
 while (Value != Sentinel)  {
  if (!ExtremesInit) {
   // Only Correct Method of Initializing Min and Max:
   //			Set equal to initial Value
   Max=Min=Value;
   ExtremesInit=True;
  }
  else UpdateExtremes(Value,Min,Max);
  // Read subsequent Values At End of Iteration
  GetInteger(Value);
 }
 Report(Min,Max,ExtremesInit);
 return(0);
}

void GetInteger(int &Number) // Number: Output Only
{cout << "Enter an Integer. Enter " << Sentinel << " to Quit >";
 cin >> Number;
}

void UpdateExtremes(int N,int &Low,int &Hi) // N      : Input Only
{if (N>Hi) Hi=N;                            // Low, Hi: Input/Output
 else if (N<Low) Low=N;
}

void Report(int Smallest,int Largest,int Data) // All arguments: Input Only
{if (Data)
  cout << "Minimum Value:" << Smallest
			<< "\tMaximum Value:" << Largest << endl;
 else
  cout << "No Data to Report\n";
}