fig20_27.cpp

经典vc教程的例子程序

// Fig. 20.27: fig20_27.cpp
// Demonstrates standard library functions equal, 
// mismatch, lexicographical_compare.
#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

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 };
   vector< int > v1( a1, a1 + SIZE ),
                 v2( a1, a1 + SIZE ),
                 v3( a2, a2 + SIZE );
   ostream_iterator< int > output( cout, " " );

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

   bool result = equal( v1.begin(), v1.end(), v2.begin() );
   cout << "\n\nVector v1 " << ( result ? "is" : "is not" ) 
        << " equal to vector v2.\n";

   result = equal( v1.begin(), v1.end(), v3.begin() );
   cout << "Vector v1 " << ( result ? "is" : "is not" ) 
        << " equal to vector v3.\n";

   pair< vector< int >::iterator,
         vector< int >::iterator > location;
   location = 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", c2[ SIZE ] = "BYE BYE";

   result = 
      lexicographical_compare( c1, c1 + SIZE, c2, c2 + SIZE );
   cout << c1 
        << ( result ? " is less than " : " is greater than " )
        << c2;

   cout << endl;
   return 0;
}