Source of scope2.cpp

Structures and functions

  1: //scope2.cpp
  2: //Illustrates global function scope and "prototype scope"

  4: #include <iostream>
  5: using namespace std;

  7: #include "utilities.h"
  8: using Scobey::Pause;

 10: int i = 1;
 11: void DoIt(int& i); //DoIt has global (file) scope; i has "prototype scope"

 13: int main()
 14: {
 15:     int i = 3;

 17:     DoIt(i);
 18:     cout << endl << i << endl;
 19:     Pause(0, "", 1);
 20:     {
 21:         DoIt(i);
 22:         cout << i << endl;
 23:         Pause(0, "", 2);

 25:         i = 5;
 26:         DoIt(i);
 27:         cout << i << endl;
 28:         Pause(0, "", 3);

 30:         int i = 7;
 31:         DoIt(i);
 32:         cout << i << endl;
 33:         Pause(0, "", 4);
 34:     }
 35:     DoIt(i);
 36:     cout << i << endl;
 37:     Pause(0, "", 5);
 38: }

 40: void DoIt(int& j)
 41: //Note that we don't have to use i as the parameter name here.
 42: {
 43:     j *= j;
 44: }

 46: /*
 47: Question:
 48: What values are output?

 50: Answer:
 51: 9 81 25 49 625
 52: */