// File: WhileBoolFlagFunctionSwitchSentinel.CPP
// Sentinel Terminated; Switch Statement Used; 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;

// Return a Character to identify if the present value is a new extreme
// + ==> New Max  - ==> New Min
char Relation(int,int,int);

int main()
{int Value,Min,Max,ExtremesInit=False;
 // Prompt For First Value
 cout << "Enter the 1st Integer. " << Sentinel << " Quits >";
 // Read first Value Before Loop
 cin >> 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 switch(Relation(Value,Min,Max)) {
   case '+':
    Max=Value;
    break;
   case '-':
    Min=Value;
    break;
   default:
    // Default Action: Do Nothing...Could (should) have left this part out
    break;
  }
  // Read subsequent Values At End of Iteration
  cout << "Enter the Next Integer. " << Sentinel << " Quits >";
  cin >> Value;
 }
 if (ExtremesInit)
  cout << "Minimum:" << Min << "\tMaximum:" << Max << endl;
 return(0);
}

char Relation(int N,int Minimum,int Maximum)
{if (N>Maximum) return('+');
 if (N<Minimum) return('-');
 return('0');
}