public class binarysearch {

public static void main(String[] args) {

// TODO Auto-generated method stub

int[] arr= {10,20,30,40,50};

int data=30;

System.out.println(binary(arr,data));

}

public static int binary(int[] arr,int data) {

int start=0;

int end=arr.length-1;

while(start<=end)

{

int mid=(start+end)/2;

if(arr[mid]==data)

{

return mid;

}

else if(arr[mid]<data){

start=mid+1;

}

else if(arr[mid]>data){

end=mid-1;

}

}

return -1;

}

}