Shuffle Array

#include <stdio.h>
#include <stdlib.h>
void shuffle(int *a, int size) {
  int i, j, b;
  for (i = size - 1; i > 1; i--) {
    j = rand() % (i - 1);
    b = a[i];
    a[i] = a[j];
    a[j] = b;
  }
}

int main(void) {
  int i, j, size;
  int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  size = sizeof(a) / sizeof(int);
  for (i = 0; i < 20; i++) {
    shuffle(a, size);
    for (j = 0; j < size; j++) {
      printf("%d", a[j]);
      if (j < size - 1) printf(" ");
    }
    printf("\n");
  }
  return EXIT_SUCCESS;
}