fig23_27.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 23.27: Fig23_27.cpp
// Standard Library functions equal, mismatch and lexicographical_compare.
#include <iostream>
using std::cout;
using std::endl;

#include <algorithm> // algorithm definitions
#include <vector> // vector class-template definition
#include <iterator> // ostream_iterator

int main()
{
   const int SIZE = 10;
   int a1[ SIZE ] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
   int a2[ SIZE ] = { 1, 2, 3, 4, 1000, 6, 7, 8, 9, 10 };
   std::vector< int > v1( a1, a1 + SIZE ); // copy of a1
   std::vector< int > v2( a1, a1 + SIZE ); // copy of a1
   std::vector< int > v3( a2, a2 + SIZE ); // copy of a2
   std::ostream_iterator< int > output( cout, " " );

   cout << "Vector v1 contains: ";
   std::copy( v1.begin(), v1.end(), output );
   cout << "\nVector v2 contains: ";
   std::copy( v2.begin(), v2.end(), output );
   cout << "\nVector v3 contains: ";
   std::copy( v3.begin(), v3.end(), output );

   // compare vectors v1 and v2 for equality
   bool result = std::equal( v1.begin(), v1.end(), v2.begin() );
   cout << "\n\nVector v1 " << ( result ? "is" : "is not" ) 
      << " equal to vector v2.\n";

   // compare vectors v1 and v3 for equality
   result = std::equal( v1.begin(), v1.end(), v3.begin() );
   cout << "Vector v1 " << ( result ? "is" : "is not" ) 
      << " equal to vector v3.\n";

   // location represents pair of vector iterators
   std::pair< std::vector< int >::iterator, 
      std::vector< int >::iterator > location;

   // check for mismatch between v1 and v3                      
   location = std::mismatch( v1.begin(), v1.end(), v3.begin() );
   cout << "\nThere is a mismatch between v1 and v3 at location "
      << ( location.first - v1.begin() ) << "\nwhere v1 contains " 
      << *location.first << " and v3 contains " << *location.second  
      << "\n\n";

   char c1[ SIZE ] = "HELLO";
   char c2[ SIZE ] = "BYE BYE";

   // perform lexicographical comparison of c1 and c2
   result = std::lexicographical_compare( c1, c1 + SIZE, c2, c2 + SIZE );
   cout << c1 << ( result ? " is less than " : 
      " is greater than or equal to " ) << c2 << endl;
   return 0;
} // end main

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