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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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src
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fig21_05.jar
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Ch21
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Fig21_05
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fig21_05.cpp
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C/C++ Source or Header
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1997-11-13
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1KB
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50 lines
// Fig. 21.5: fig21_05.cpp
// Demonstrating namespaces.
#include <iostream>
using namespace std; // use std namespace
int myInt = 98; // global variable
namespace Example {
const double PI = 3.14159;
const double E = 2.71828;
int myInt = 8;
void printValues();
namespace Inner { // nested namespace
enum Years { FISCAL1 = 1990, FISCAL2, FISCAL3 };
}
}
namespace { // unnamed namespace
double d = 88.22;
}
int main()
{
// output value d of unnamed namespace
cout << "d = " << d;
// output global variable
cout << "\n(global) myInt = " << myInt;
// output values of Example namespace
cout << "\nPI = " << Example::PI << "\nE = "
<< Example::E << "\nmyInt = "
<< Example::myInt << "\nFISCAL3 = "
<< Example::Inner::FISCAL3 << endl;
Example::printValues(); // invoke printValues function
return 0;
}
void Example::printValues()
{
cout << "\n\nIn printValues:\n" << "myInt = "
<< myInt << "\nPI = " << PI << "\nE = "
<< E << "\nd = " << d << "\n(global) myInt = "
<< ::myInt << "\nFISCAL3 = "
<< Inner::FISCAL3 << endl;
}