Write a program to find the 2nd Largest and 2nd smallest value

#include <stdio.h>
#include <conio.h>
void main ()
{
 int number[30];
 int i,j,a,n,counter,ave;
 clrscr();

 printf ("Enter the value of N\n");
 scanf ("%d", &n);

 printf ("Enter the numbers \n");
 for (i=0; i<n; ++i)
 scanf ("%d",&number[i]);

 for (i=0; i<n; ++i)
 {
 for (j=i+1; j<n; ++j)
 {
 if (number[i] < number[j])
 {
 a = number[i];
 number[i] = number[j];
 number[j] = a;
 }
 }
 }

 printf ("The numbers arranged in descending order are given below\n");
 for (i=0; i<n; ++i)
 {
 printf ("%d\n",number[i]);
 }

 printf ("The 2nd largest number is = %d\n", number[1]);
 printf ("The 2nd smallest number is = %d\n", number[n-2]);

 ave = (number[1] +number[n-2])/2;
 counter = 0;

 for (i=0; i<n; ++i)
 {
 if (ave == number[i])
 {
 ++counter;
 }
 }
 if (counter == 0 )
 printf ("The average of %d and %d is = %d is not in the array\n", number[1], number[n-2], ave);
 else
 printf ("The average of %d and %d in array is %d in numbers\n",number[1], number[n-2], counter);

 getch();
} /* End of main() */
/*-------------------------------------------------------
 Output
 Enter the value of N
 6
 Enter the numbers
 30
 80
 10
 40
 70
 90
 The numbers arranged in descending order are given below
 90
 80
 70
 40
 30
 10
 The 2nd largest number is = 80
 The 2nd smallest number is = 30
 The average of 80 and 30 is = 55 is not in the array
 -------------------------------------------------------*/