src/examples/bubsort.c

   1 /* sort.c
   2
   3    Test program to sort a large number of integers.
   4
   5    Intention is to stress virtual memory system.
   6
   7    Ideally, we could read the unsorted array off of the file
   8    system, and store the result back to the file system! */
   9 #include <stdio.h>
  10
  11 /* Size of array to sort. */
  12 #define SORT_SIZE 128
  13
  14 int
  15 main (void)
  16 {
  17   /* Array to sort.  Static to reduce stack usage. */
  18   static int array[SORT_SIZE];
  19
  20   int i, j, tmp;
  21
  22   /* First initialize the array in descending order. */
  23   for (i = 0; i < SORT_SIZE; i++)
  24     array[i] = SORT_SIZE - i - 1;
  25
  26   /* Then sort in ascending order. */
  27   for (i = 0; i < SORT_SIZE - 1; i++)
  28     for (j = 0; j < SORT_SIZE - 1 - i; j++)
  29       if (array[j] > array[j + 1])
  30         {
  31           tmp = array[j];
  32           array[j] = array[j + 1];
  33           array[j + 1] = tmp;
  34         }
  35
  36   printf ("sort exiting with code %d\n", array[0]);
  37   return array[0];
  38 }