C Program to find second largest and second smallest element in an array

Arrays in C,
C Program to find second largest and second smallest element in the array.  Program will accept a list of data items and find the second largest and second smallest elements in it. And also compute the average of both. And search for the average value whether it is present in the array or not. Display appropriate message on successful search.  Read more about C Programming Language .

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#include <stdio.h>

void main ()
 int number[30];
 int i,j,a,n,counter,ave;

 printf ("Enter the value of Nn");
 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 belown");
 for (i=0; i<n; ++i)
  printf ("%dn",number[i]);

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

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

 for (i=0; i<n; ++i)
  if (ave == number[i])
 if (counter == 0 )
  printf ("The average of %d  and %d is = %d is not in the arrayn", number[1], number[n-2], ave);
  printf ("The average of %d  and %d in the array is %d in numbersn",number[1], number[n-2], counter);
}           /* End of main() */
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