Untitled

import java.util.*;
import java.lang.*;
import java.io.*;

class Codechef
{
    public static void update(int marks[]){
        
        for(int i=0;i<marks.length;i++){
            marks[i]+=1;
        }
        
    }
    
    public static int linearSearch(int numbers[],int key){
        
        for(int i=0;i<numbers.length;i++){
            if(numbers[i]==key){
                return i;
            }
        }
        
        return -1;
        
    }
	public static void main (String[] args) throws java.lang.Exception
	{
// 	  int marks[]={56,60,67};
	  
// 	  update(marks);
	  
// 	  for(int i=0;i<marks.length;i++){
// 	      System.out.println(marks[i]+" ");
// 	  }
	  
	  int numbers[]={0,7,1,2,3,4,5,6,7,8,9,10,11};
	  
	  int key=100;
	  
	  int value=linearSearch(numbers,key);
	  if(value<0){
	      System.out.println("key doesn't exist");
	  }else{
	      System.out.println("Key is "+value);
	  }
	  
	  

	}
}