4

Apply a function to the elements of a table

  1. #include <stdio.h>
  2.  
  3. int inc( int *n ) {
  4.     return ++*n;
  5. }
  6.  
  7. int dec( int *n ) {
  8.     return --*n;
  9. }
  10.  
  11. void apply( int (*f)( int * ), int tab[], int siz ) {
  12.     int *p;
  13.  
  14.     for( p = tab; p < tab+siz; p++ )
  15.         f( p );
  16. }
  17.  
  18. main() {
  19.     int i;
  20.  
  21.     int tab[ 10 ];
  22.  
  23.     for ( i = 0; i < 10; i++ )
  24.         tab[ i ] = i;
  25.  
  26.     for ( i = 0; i < 10; i++ )
  27.         printf("%d\n", tab[ i ]);
  28.  
  29.     apply( inc, tab, 10 );
  30.  
  31.     printf("\n");
  32.     for ( i = 0; i < 10; i++ )
  33.         printf("%d\n", tab[ i ]);
  34.  
  35.     apply( dec, tab, 10 );
  36.     printf("\n");
  37.     for ( i = 0; i < 10; i++ )
  38.         printf("%d\n", tab[ i ]);
  39. }
$ gcc -o apply apply.c
$ ./apply
0
1
2
...

1
2
3
...

0
1
2
...

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