#include <stdio.h>

// finding the index of the biggest number;
int index_of_max(float a[ ], int n)
{
   int i, i_max = 0;

   for (i = 1; i < n; i++)
   {
       if (a[i] > a[i_max])
       {
          i_max = i;
       }
   }

   return i_max;
}

// swapping position of the current biggest number, by pointers;
void swap(float *p1, float *p2)
{
     float p3 = *p1;
     *p1 = *p2;
     *p2 = p3;
}

// calculates the final and future location of the current biggest number;
void max_sort(float a[], int n)
{
   int length;

   for (length = n ; length > 1; length--)
   {
       int i_max = index_of_max(a, length);
       swap(&a[length-1], &a[i_max]);
   }

}

// main function;
int main()
{
    FILE *fin;
    int num, i;
    float fnum[num-1];
    fin = fopen("read_it.txt", "rt");

    fflush(stdin);
    fscanf(fin, "%d", &num);

    // reading the numbers from a file;
    for (i = 0; i < num; i++)
    {
        fflush(stdin);
        fscanf(fin, "%f", &fnum[i]);
        printf("%d. %.2lf\n", i+1, fnum[i]);
    }

    // calling for the function, which will sort the received numbers;
    max_sort(fnum, num);
    putchar('\n');

    // reading the numbers on the screen, after they have been sorted;
    for (i = 0; i < num; i++)
    {
        printf("%d. %.2lf\n", i+1, fnum[i]);
    }

    fclose(fin);
    fflush(stdin);
    getchar();

    return 0;
}