#include<stdio.h>
int binsrc(int x[],int low,int high,int key)
{
 	int mid;
	while(low<=high)
	{
		mid=(low+high)/2;
		if(x[mid]==key)
			return mid;
		if(x[mid]<key)
			low=mid+1;
		else
			high=mid-1;
	}
	return -1;
}

int main()
{
	int a[20],key,i,n,succ;
	printf("Enter the n value");
	scanf("%d",&n);
	if(n>0)
	{
        	printf("enter the elements in ascending order\n");
		for(i=0;i<n;i++)
		scanf("%d",&a[i]); 
	
        	printf("enter the key element to be searched\n");
	        scanf("%d",&key);
		succ=binsrc(a,0,n-1,key);
		if(succ>=0)
			printf("Element found in position = %d\n",succ+1);
		else
	 		printf("Element not found \n");
	}
	else
		printf("Number of element should be greater than zero\n");
   	return 0;
}