//
// Filename:      pgm3_4a.cpp
//
// Description:   Demo program, Scope #1: Global, Local and Block Scope
//
// ENSC 104:      Digital Computer Programming
//
// Instructor:    Dr. Walsh
//
// Section:       2
//
// Date Created:  03/17/98
// Last Modified: 03/17/98
//
// Name:          N/A
//

#include <iostream.h>

void sub( void );

int x = 1;      // global variable
int y = -1;     // global variable

main()
   {
   cout << "X = " << x << ", Y = " << y << endl;

   int x = 5;   // local variable to main
   cout << "X = " << x << ", Y = " << y << endl;

      { // Block A
      int x = 10; // variable local to block A
      cout << "X = " << x << ", Y = " << y  << endl;
      
         { // Block B
         int x = 15; // variable local to block B
         cout << "X = " << x << ", Y = " << y << endl;
         
            { // Block C
            int x =  20;
            int y = -20;
            cout << "X = " << x << ", Y = " << y  << endl;
            sub();
            } // End Block C
         
         sub();

         } // End Block B

      cout << "X = " << x << ", Y = " << y  << endl;
      } // End Block A

   cout << "X = " << x << ", Y = " << y  << endl;

   return 0;

   } // End Main


void sub( void )
   {
   cout << "*** Inside sub(), X = " << x << endl;
   }