ICSE − Q & A

PLEAse help!!
Explain differnce between local,instance and class variable?

public class sales          
 { int invoice=1234; 
   static pro_code;
 
     public static void main()
         { sales s= new sales();
           int price=1000;
           s.show(price); 
              } 
     void show(int pr) 
       { System.out.println(invoice); 
         System.out.println(pro_code);
         System.out.println(pr); 
        }
 }       

Name the following from the above code: 
 (i) class variable  // pro_code??
 (ii) local variable  // price??
 (iii) instance variable  //invoice??
 (iv) method variable   // pr??

Are these answers correct? Please help!!

any eco students ??in our papaer 4 marks were out of scope right`???

whats the difference between a method and a function

int z=148;
 while (10>9)
 {
 if(z<139) 
break;
 System.out.println("computer" +z);
 z=z-3;
 }System.out.println(z);
 How many times the loop will execute ?
What is the output?

Can anyone pls... Explain me selection and and bubble sort program with the help of dry run

If you want to practice output prediction question, here's the link --->
https://drive.google.com/folderview?id=1-2xrFu4I-iZaHlK_g288VuNvI8ZM9zqQ


I hope this will help :D
All the best!

Is it necessary to use public for function prototype questions
ex:can we write float sum(int x) instead of public float sum(int x)

Hope rises like a phoenix from the ashes of shattered dreams.

Is this the correct format of writing a number program using method? , if not send me the format Thank you... 

import java.util.*;
class Niv
{
    public static void main(String args [])
    {
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a number");
        int n=in.nextInt();
        int num=n;
        int sum=sumOfDigits(n);
        
        if(num%sum==0)
        System.out.println(num+" is a Niven number");
        else
         System.out.println(num+" is not a given number");
          
         
        }
        
        
        public static int sumOfDigits(int g)
        {
            int sum=0;
            while(g>0)
            {
            int rem;
            rem=g%10;
            sum=sum+rem;
            g=g/10;
        }
        return sum;
        
        
        
    }
}