//Matthias Bartolo BC1B GroupA

import java.util.Scanner;

public class Question3

{

public static void main(String args[]){

Scanner sc = new Scanner(System.in);

int array[]= new int[20];

boolean found ;

int input=0;

System.out.println("Input 20 numbers");

for(int i = 0; i<20;i++){

System.out.println("Input num "+(i+1));

try{

array[i]= sc.nextInt();

}

catch(Exception e){

System.out.println(e);

i--;

}

sc.nextLine();

}

do{

System.out.println("choose from the following Options:\n1.Search\n2.Non Negative Numbers\n3.Quit");

try{

input = sc.nextInt();

}

catch(Exception e){

System.out.println(e);

}

sc.nextLine();

switch (input){

case 1: found=false;

System.out.println("Input num you want to find");

input= sc.nextInt();

for(int i = 0; i<20;i++){

if(input==array[i]){

System.out.println("Element was found at position "+i);

found=true;

}

}

if(found==false)

System.out.println("Element was not found ");

break;

case 2:

for(int i = 0; i<20;i++){

if(array[i]>0){

System.out.print(array[i]+" ");

}

}

break;

case 3:System.out.println("Goodbye");

break;

default: System.out.println("Invalid");

}

}while(input!=3);

}

}