chararraycomparison.cpp

C++大学简明教程,解压就行没有密码。希望对大家有用

// Exercise 22.16: CharacterArrayComparison.cpp
// Overload comparison operators for the user-defined CharArray class
#include <iostream> // required to perform C++ stream I/O
#include <string>   // required to access string functions
#include "CharArray.h" // CharArray class definition

using namespace std; // for accessing C++ Standard Library members

// overloaded stream insertion operator
ostream &operator<<( ostream &, CharArray & );

// overloaded stream extraction operator
istream &operator>>( istream &, CharArray & );

int main()
{
   // define variables
   CharArray text1; // first character array that the user inputs
   CharArray text2; // second character array that the user inputs

   // prompt user for and input first character array
   cout << "\nEnter a character array: ";
   cin >> text1;

   // prompt user for and input second character array
   cout << "Enter a second character array: ";
   cin >> text2;

   // compare character arrays
   if ( text1 == text2 )
   {
      cout << "\nThe two character arrays are equal." << endl;

   } // end if
   else if ( text1 > text2 )
   {
      cout << "\n" << text1 << " is greater than " << text2 << endl;

   } // end else if
   else
   {
      cout << "\n" << text1 << " is less than " << text2 << endl;

   } // end else

   cout << endl;

   return 0; // indicate that program ended successfully

} // end main

// overloaded stream-insertion operator
ostream &operator<<( ostream &output, CharArray &myArray )
{
   for ( int i = 0; i < myArray.getLength(); i++ )
   {
      output  << myArray.getChar( i );

   } // end for

   return output; // enables cout << a << b << c;

} // end function operator<< 

// overloaded stream-extraction operator
istream &operator>>( istream &input, CharArray &myArray )
{
   string buffer; // temporarily store input

   // get input from input stream
   getline( input, buffer );

   myArray.setLength( static_cast< int > ( buffer.length() ) );

   // place input in myArray's array
   for ( int i = 0; ( i < buffer.length() ); i++ )
   {
      myArray.setChar( buffer[ i ], i );
   
   } // end for

   return input; // enables cin >> a >> b >> c;

} // end function operator>> 

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