sortiranje na fajl

#include <stdio.h>
#include<conio.h>
#define MAX_SIZE 20

  void bubble(int a[],int n)
  {
        int i,j,t;
         for(i=n-1;i>=0;i--)
         {
            for(j=0;j<=i;j++)

                  {
                    if(a[j]>a[j+1])
                                    {
                                      t=a[j];
                                     a[j]=a[j+1];
                                     a[j+1]=t;
                                    }
                   }


           }//end for 1.

  }//end function.

int main ()
{
    int a[MAX_SIZE];
    int i, n;

    FILE *pf;
    pf = fopen("ulaz.txt", "r");

    printf("unesite broj elemenata niza\n");
    scanf("%d", &n);

    for(i=0; i <= n; i++)
    {
        fscanf(pf, "%d", &a[i]);
    }

    fclose(pf);

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

    // poziv funkcije za sortiranje
    bubble(a,n);

    pf = fopen("izlaz.txt", "w");
    for (i=0; i<n; i++)
    {
        fprintf(pf, "a[%d] = %d\n", i, a[i]);

    }
    fclose(pf);

    return 0;
}