fig07_26.cpp

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// Fig. 7.26: fig07_26.cpp
// Demonstrating C++ Standard Library class template vector.
#include <iostream>
using std::cout;
using std::cin;
using std::endl;

#include <iomanip>
using std::setw;

#include <vector>
using std::vector;

void outputVector( const vector< int > & ); // display the vector
void inputVector( vector< int > & ); // input values into the vector

int main()
{
   vector< int > integers1( 7 ); // 7-element vector< int >
   vector< int > integers2( 10 ); // 10-element vector< int >
 
   // print integers1 size and contents
   cout << "Size of vector integers1 is " << integers1.size()
      << "\nvector after initialization:" << endl;
   outputVector( integers1 );

   // print integers2 size and contents
   cout << "\nSize of vector integers2 is " << integers2.size()
      << "\nvector after initialization:" << endl;
   outputVector( integers2 );

   // input and print integers1 and integers2
   cout << "\nEnter 17 integers:" << endl;
   inputVector( integers1 );
   inputVector( integers2 );

   cout << "\nAfter input, the vectors contain:\n"
      << "integers1:" << endl;
   outputVector( integers1 );
   cout << "integers2:" << endl;
   outputVector( integers2 );

   // use inequality (!=) operator with vector objects
   cout << "\nEvaluating: integers1 != integers2" << endl;

   if ( integers1 != integers2 )
      cout << "integers1 and integers2 are not equal" << endl;

   // create vector integers3 using integers1 as an
   // initializer; print size and contents
   vector< int > integers3( integers1 ); // copy constructor

   cout << "\nSize of vector integers3 is " << integers3.size()
      << "\nvector after initialization:" << endl;
   outputVector( integers3 );

   // use assignment (=) operator with vector objects
   cout << "\nAssigning integers2 to integers1:" << endl;
   integers1 = integers2; // integers1 is larger than integers2

   cout << "integers1:" << endl;
   outputVector( integers1 );
   cout << "integers2:" << endl;
   outputVector( integers2 );

   // use equality (==) operator with vector objects
   cout << "\nEvaluating: integers1 == integers2" << endl;

   if ( integers1 == integers2 )
      cout << "integers1 and integers2 are equal" << endl;

   // use square brackets to create rvalue
   cout << "\nintegers1[5] is " << integers1[ 5 ];

   // use square brackets to create lvalue
   cout << "\n\nAssigning 1000 to integers1[5]" << endl;
   integers1[ 5 ] = 1000;
   cout << "integers1:" << endl;
   outputVector( integers1 );

   // attempt to use out-of-range subscript
   cout << "\nAttempt to assign 1000 to integers1.at( 15 )" << endl;
   integers1.at( 15 ) = 1000; // ERROR: out of range
   return 0;
} // end main

// output vector contents
void outputVector( const vector< int > &array )
{
   size_t i; // declare control variable
   
   for ( i = 0; i < array.size(); i++ )
   {
      cout << setw( 12 ) << array[ i ];

      if ( ( i + 1 ) % 4 == 0 ) // 4 numbers per row of output
         cout << endl;
   } // end for

   if ( i % 4 != 0 )
      cout << endl;
} // end function outputVector

// input vector contents
void inputVector( vector< int > &array )
{
   for ( size_t i = 0; i < array.size(); i++ )
      cin >> array[ i ];
} // end function inputVector

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