Yurttas/PL/OOL/Cplusplus/F/02/04/02/00/01/m 01.cpp

 1/*
 2   Copyright(C) 1998
 3   All Rights Reserved. Salih Yurttas, ZCubes, BitsOfCode Software Systems, Inc..
 4
 5   Permission to use, copy, modify, and distribute this
 6   software and its documentation for EDUCATIONAL purposes
 7   and without fee is hereby granted provided that this
 8   copyright notice appears in all copies.
 9 
10   date   : January 1, 1998.
11   author : Salih Yurttas.
12
13   m_01.cpp
14*/
15
16
17// the following is the worst programming you can do!
18
19// the rule: minimize or eliminate the globals
20//           use locals
21
22
23#include <iostream>
24
25using namespace std;
26
27int i=0; // by default, i, j, and a are all global with initializers
28int j=0;
29
30int a=1; // i, j, and a exists and visible in the file scope
31         // i, j, and a  are r/w (lhs/rhs) in every function following
32         // declarations/definitions.
33
34void f() {
35  cout << "f / ";
36  cout << ++j;
37  cout << endl;
38  cout << "a = ";
39  cout << ++a;
40  cout << endl;
41}
42
43int main(int argc, char* argv[]) {
44
45  cout << "m / ";
46  cout << ++i;
47  cout << endl;
48  cout << "a = ";
49  cout << ++a;
50  cout << endl;
51
52  cout << endl;
53
54  f();
55
56  cout << endl;
57
58  cout << "m / ";
59  cout << ++i;
60  cout << endl;
61  cout << "a = ";
62  cout << ++a;
63  cout << endl;
64
65  cout << endl;
66
67  f();
68
69  cout << endl;
70
71  cout << "m / ";
72  cout << ++i;
73  cout << endl;
74  cout << "a = ";
75  cout << ++a;
76  cout << endl;
77
78}