linear search

hey so this is my code for linear search. is there a problem with this?. coz its not comparing and returning if i enter an element which does not exist in the array

#include<stdio.h>
#include<conio.h>
int main()
{
     int A[10]={2,3,4,5,6,7,8,9,1,20};
     int n,item,counter=1,i;
     printf("\nEnter the size of the array");
     scanf("%d",&n);
     printf("\nThe array size is A[%d]",n);
     printf("\nEnter the number you would like to search in the array");
     scanf("%d",&item);
     A[n+1]=item;
     for(i=0;i<n;i++)
     {
        if(A[counter]==item)
        {
          printf("\nItem found in the array!!");

        }
        counter++;
     }
       while(A[counter]!=item)            
         {       
                 printf("\nItem not found in the list");
            counter++;
         };

getch();
return 0;


}