fig04_14.cpp

来自「经典vc教程的例子程序」· C++ 代码 · 共 53 行

// Fig. 4.14: fig04_14.cpp
// Passing arrays and individual array elements to functions
#include <iostream.h>
#include <iomanip.h>

void modifyArray( int [], int );  // appears strange
void modifyElement( int );

int main()
{
   const int arraySize = 5;
   int i, a[ arraySize ] = { 0, 1, 2, 3, 4 };

   cout << "Effects of passing entire array call-by-reference:" 
        << "\n\nThe values of the original array are:\n";

   for ( i = 0; i < arraySize; i++ )
      cout << setw( 3 ) << a[ i ];

   cout << endl;

   // array a passed call-by-reference
   modifyArray( a, arraySize );  

   cout << "The values of the modified array are:\n";

   for ( i = 0; i < arraySize; i++ )
      cout << setw( 3 ) << a[ i ];

   cout << "\n\n\n"
        << "Effects of passing array element call-by-value:"
        << "\n\nThe value of a[3] is " << a[ 3 ] << '\n';

   modifyElement( a[ 3 ] );

   cout << "The value of a[3] is " << a[ 3 ] << endl;

   return 0;
}

void modifyArray( int b[], int sizeOfArray )
{
   for ( int j = 0; j < sizeOfArray; j++ )
      b[ j ] *= 2;
}

void modifyElement( int e )
{
   cout << "Value in modifyElement is " 
        << ( e *= 2 ) << endl;
}