Program for binary search in C

#include <stdio.h>

int main()
{
   int c, first, last, middle, n, search, array[100];

   printf("Enter number of elementsn");
   scanf("%d",&n);

   printf("Enter %d integersn", n);

   for ( c = 0 ; c < n ; c++ )
      scanf("%d",&array[c]);

   printf("Enter value to findn");
   scanf("%d",&search);

   first = 0;
   last = n - 1;
   middle = (first+last)/2;

   while( first <= last )
   {
      if ( array[middle] < search )
         first = middle + 1;    
      else if ( array[middle] == search ) 
      {
         printf("%d found at location %d.n", search, middle+1);
         break;
      }
      else
         last = middle - 1;

      middle = (first + last)/2;
   }
   if ( first > last )
      printf("Not found! %d is not present in the list.n", search);

   return 0;   
}

Output

Enter number of elements
9

Enter 9 integers

9
8
5
6
4
7
3
1
11

Enter value to find
9
9 found at location 1.