// File: WhileLoopFunctionsAsk.cpp
// AskBeforeIterating; Functions; Init Using First Value; While Loop
// Find the Extremes in a List of integers
// Method of Iteration: While loop, conditional

// NOTE: Runs only in VC++

#include <iostream>

// Note inclusions required to use GetChoice Routine...
// Also need ctype.h to use the toupper() routine
#include <conio.h>
#include <ctype.h>
#include <string.h>

#define False 0
#define True  1

using namespace std;

// Input and Return a Character within a specified set
char GetChoice(char *,char *);

int main()
{int Value,Min,Max,ValuesToProcess;
 char Reply;
 Reply=GetChoice("YN","Press Y to Enter an Integer. Press N to Abort\n");
 if (toupper(Reply)=='Y') {
  cout << "Enter the 1st Integer >";
  cin >> Value;
  Max=Min=Value;
  Reply=GetChoice("YN","Press Y to Enter Another Integer. Press N to Abort\n");
  // Condition is checked immediately after input of reply. Quit if 'N'.
  while (toupper(Reply)!='N') {
   cout << "Enter the Next Integer >";
   cin >> Value;
   if (Value>Max) Max=Value;
   else if (Value<Min) Min=Value;
   // End of Iteration Action
   Reply=GetChoice("YN","Press Y to Enter Another Integer. Press N to Abort\n");
  }
  cout << "Minimum:" << Min << "\tMaximum:" << Max << endl;
 }
 return(0);
}

char GetChoice(char *ok,char *Msg)
// The string ok contains all acceptable characters.
{char ch;
 cout << Msg;
 // Read a Character Directly from the Keyboard (No echo to screen)
 // using getch(). Loops until the character is a member of the string ok
 do ch=toupper(getch()); while (strchr(ok,ch)==NULL);
 // Return the character which is a member of the string ok
 return(ch);
}