DouKaku?

#include <stdio.h>

int main()
{
  int xs[] = {3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9};
  int array_size;
  int i, j, k;
  int save;

  array_size = (sizeof(xs) / sizeof(xs[0]));
  for (i = 0; i < array_size; i++) {
    save = xs[i];
    for (j = i+1; j < array_size; j++) {
      if (save == xs[j]) {
        /* 配列を詰める作業 */
        for (k = j; k < array_size-1; k++) {
          xs[k] = xs[k+1];
        }
        array_size--;
      }
    }
  }

  for (i = 0; i < array_size; i++) {
    printf("%d ", xs[i]);
  }
  printf("\n");

  return 0;
}