ICSE − Q & A

what is the difference between writing a program with and without return type?? give examples as well.

code for happy no. is below
import java.io.*;
public class happyormagical
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter a no.");
int n=Integer.parseInt(br.readLine());
int sum=n;
while(sum>9)
{
    n=sum;
    sum=0;
    while(n>0)
    {
    int rem=n%10;
    sum=sum+rem*rem;
    n=n/10;
}
}
if(sum==1)
System.out.println("Happy no.");
else
System.out.println("Not a Happy no.");
}
}

Guys, when they say use comment lines should we write comments wherever possible while writing the program or...is it something else?

(also do you know what are the most predicted prog. questions? :/ )

Thanks!

Instance variables are class variables right? If not whats the difference?

+ 2 more questions by agrek  

Syntax of final keyword with example?
asked by Abhishek Agrawal (agrek) 8 years ago
2

What does an exclamation mark mean next to numbers in series programs?
asked by Abhishek Agrawal (agrek) 8 years ago
1

Is it compulsory to write comments ?

+ 3 more questions by prateek25  

Write a Program to Compare two Strings using Scanner Class.
asked by Prateek Rawat (prateek25) 8 years ago
1

Write a Program to find the Roots of Quadratic Equation.
asked by Prateek Rawat (prateek25) 8 years ago
0

Write a Program to find the Substring of Strings.For example substrings of “fun” are :- “f”, “fu”, “fun”, “u”, “un” and “n”
asked by Prateek Rawat (prateek25) 8 years ago
1

Guys one doubt : can the actual and the formal variables be the same ??
Like boolean b(int a,int b)
And then in main ()
on.b(a,b)
Plz I'm having this confusion for a month;!!

Guys can u sort this array for me?
String array = {"q" , "s", "a", "y", "b"};

Thanks

can someone tell me which paper to go through like which one is important except the boards(all) and specimen paper2015

+ 2 more questions by pj2000  

example of library classes plz
asked by Pj Pj (pj2000) 8 years ago
1

can someone plz tell me a full definition of a package...is it just a group of related classes?
asked by Pj Pj (pj2000) 8 years ago
1

GUYS GREAT  NEWS ...........
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Only 19 hours to freedom .

Name the two real literals of java. Mention the size of each, in bytes.