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C & C++ Multimedia Cyber Classroom
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C and C++ Multimedia Cyber Classroom (Prentice Hall) (1998).iso
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cpphtp2
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ch21
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fig21_05.txt
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1998-02-27
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1 // Fig. 21.5: fig21_05.cpp
2 // Demonstrating namespaces.
3 #include <iostream>
4 using namespace std; // use std namespace
5
6 int myInt = 98; // global variable
7
8 namespace Example {
9 const double PI = 3.14159;
10 const double E = 2.71828;
11 int myInt = 8;
12 void printValues();
13
14 namespace Inner { // nested namespace
15 enum Years { FISCAL1 = 1990, FISCAL2, FISCAL3 };
16 }
17 }
18
19 namespace { // unnamed namespace
20 double d = 88.22;
21 }
22
23 int main()
24 {
25 // output value d of unnamed namespace
26 cout << "d = " << d;
27
28 // output global variable
29 cout << "\n(global) myInt = " << myInt;
30
31 // output values of Example namespace
32 cout << "\nPI = " << Example::PI << "\nE = "
33 << Example::E << "\nmyInt = "
34 << Example::myInt << "\nFISCAL3 = "
35 << Example::Inner::FISCAL3 << endl;
36
37 Example::printValues(); // invoke printValues function
38
39 return 0;
40 }
41
42 void Example::printValues()
43 {
44 cout << "\n\nIn printValues:\n" << "myInt = "
45 << myInt << "\nPI = " << PI << "\nE = "
46 << E << "\nd = " << d << "\n(global) myInt = "
47 << ::myInt << "\nFISCAL3 = "
48 << Inner::FISCAL3 << endl;
49 }
}