// File: ForLoopBoolFlagFunctionsSentinel.CPP
// Sentinel Terminated; Functions (with Output Args); Boolean Flag; For 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
// Functions employed. All argument types exemplified

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

using namespace std;

void Update(int,int &,int &);
void Init(int,int &,int &);
void Report(int,int,int);

int main()
{int Value,Min,Max,ExtremesInit=False;
 // Prompt For First Value
 cout << "Enter the 1st Integer. " << Sentinel << " Quits >";
 cin >> Value;

 for ( ;Value != Sentinel; ) { // Could be: while(Value != Sentinel)
  if (!ExtremesInit) {
   Init(Value,Min,Max);
   ExtremesInit=True;
  }
  else
   Update(Value,Min,Max);
  cout << "Enter the Next Integer. " << Sentinel << " Quits >";
  cin >> Value;
 }
 Report(Min,Max,ExtremesInit);
 return(0);
}

// Initialize the Extremes
// Arguments:
// 	InitialValue - Input Only
//	Min, Max     - Output Only
void Init(int InitialValue,int &Min,int &Max)
{// Only Correct Method of Initializing Min and Max:
 //			Set equal to initial Value
 Min=Max=InitialValue;
}

// Update the Extremes IF the Value is a New Extreme
// Arguments:
//	Value        			- Input Only
//	LowestValue, HighestValue 	- Input/Output
void Update(int Value,int &LowestValue,int &HighestValue)
{if (Value>HighestValue) HighestValue=Value;
 else if (Value<LowestValue) LowestValue=Value;
}

// Report Results
// Arguments:	All Input Only
void Report(int Min,int Max,int DataToReport)
{if (DataToReport)
  cout << "Minimum:" << Min << "\tMaximum:" << Max << endl;
 else
  cout << "No Data Was Entered\n";
}