Comparing sequences of values for equality using algorithms lexicographical_compare. - C++ STL Algorithm

C++ examples for STL Algorithm:lexicographical_compare

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Description

Comparing sequences of values for equality using algorithms lexicographical_compare.

Demo Code

#include <iostream> 
 #include <algorithm> // algorithm definitions 
 #include <vector> // vector class-template definition 
 #include <iterator> // ostream_iterator 
 using namespace std; 

int main() //from  www. ja  va  2s. c om
{ 
    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 ); // copy of a1 
    vector< int > v2( a1, a1 + SIZE ); // copy of a1 
    vector< int > v3( a2, a2 + SIZE ); // copy of a2 
    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 ); 

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

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

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

Result


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