/* Fig. 6.13: fig06_13.c
   Passing arrays and individual array elements to functions */
#include <stdio.h>
#define SIZE 5

/* function prototypes */
void modifyArray( int b[], int size ); 
void modifyElement( int e );

/* function main begins program execution */
int main()
{
   int a[ SIZE ] = { 0, 1, 2, 3, 4 }; /* initialize a */
   int i; /* counter */

   printf( "Effects of passing entire array by reference:\n\nThe "
          "values of the original array are:\n" );

   /* output original array */
   for ( i = 0; i < SIZE; i++ ) { 
      printf( "%3d", a[ i ] );
   } /* end for */

   printf( "\n" );

   /* pass array a to modifyArray by reference */
   modifyArray( a, SIZE );  

   printf( "The values of the modified array are:\n" );

   /* output modified array */
   for ( i = 0; i < SIZE; i++ ) {
      printf( "%3d", a[ i ] );
   } /* end for */

   /* output value of a[ 3 ] */
   printf( "\n\n\nEffects of passing array element "
           "by value:\n\nThe value of a[3] is %d\n", a[ 3 ] );
   
   modifyElement( a[ 3 ] ); /* pass array element a[ 3 ] by value */

   /* output value of a[ 3 ] */
   printf( "The value of a[ 3 ] is %d\n", a[ 3 ] );
   
   return 0; /* indicates successful termination */

} /* end main */

/* in function modifyArray, "b" points to the original array "a" 
   in memory */ 
void modifyArray( int b[], int size )
{
   int j; /* counter */

   /* multiply each array element by 2 */
   for ( j = 0; j < size; j++ ) {
      b[ j ] *= 2;
   } /* end for */

} /* end function modifyArray */

/* in function modifyElement, "e" is a local copy of array element
   a[ 3 ] passed from main */
void modifyElement( int e )
{
   /* multiply parameter by 2 */
   printf( "Value in modifyElement is %d\n", e *= 2 );
} /* end function modifyElement */



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