fig26_20.cpp

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

// Fig. 26.20: Fig26_20.cpp
// Demonstrating stream-manipulators boolalpha and noboolalpha.
#include <iostream>
using std::boolalpha;
using std::cout;
using std::endl;
using std::noboolalpha;

int main()
{
   bool booleanValue = true;

   // display default true booleanValue
   cout << "booleanValue is " << booleanValue << endl;

   // display booleanValue after using boolalpha
   cout << "booleanValue (after using boolalpha) is "
      << boolalpha << booleanValue << endl << endl;

   cout << "switch booleanValue and use noboolalpha" << endl;
   booleanValue = false; // change booleanValue
   cout << noboolalpha << endl; // use noboolalpha

   // display default false booleanValue after using noboolalpha
   cout << "booleanValue is " << booleanValue << endl;

   // display booleanValue after using boolalpha again
   cout << "booleanValue (after using boolalpha) is "
      << boolalpha << booleanValue << endl;
   return 0;
} // end main

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