#include<stdio.h>
#include<math.h>
#include<stdbool.h>
void main()
{
    int a[20];
    int j, i, k, h, save;

    i = -1;

    do
    {
        i++;
        printf("enter value a  %d = ", i + 1);
        scanf("%d", &a[i]);
    }while(a[i] >= 0);

    for (k = 0; k < i - 1; k++)
    {
        for (h =k + 1; h < i; h++)
        {
             if(a[k]>a[h])
             {
                save = a[k];
                a[k] = a[h];
                a[h] = save;
             }
        }
    }

   printf("a = ");
   for ( j = 0; j < i; j++ )
      printf("%d\t", a[j]);

  getch();
}