Write a C program for Binary Search ?

C Program for Binary Search

#include<conio.h>
#include<stdio.h>

 main()
{
   int c, first, last, middle, n, search, array[100];
   printf("Enter number of elements\n");
   scanf("%d",&n);
   printf("Enter %d integers\n", n);
   for ( c = 0 ; c < n ; c++ )
      scanf("%d",&array[c]);
   printf("Enter value to find\n");
   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;  
}