Can any one please explain me the meaning of 4th and 5th line. That- Question mark and colon ?

Question

public class Program
{ public static void main(String [ ] args)
{
boolean b = 20%10 == 1;
int i = b? 5: 2; System.out.print(i);
}
}

Answer 1

NIKHIL JOSHI Sure here is the explanation :

'%' is used to find the remainder after division. So, when you divide 20 by 10 you get 2 as the result and 0 as the remainder. Like :

10)20(2
20
-------
0

And then we are saying 20%10 == 1. It is false, because 20%10 is 0. And 0 is not equal to 1. Therefore,

boolean b = false;

Now,

int i = b ? 5 : 2;

It is a fancy way to write if-else statement. For example, the equivalent code is :

if (b == true) {
i = 5;
} else {
i = 2;
}

As our b is false, the value of 'i' will be 2.

Therefore the answer is 2!

Answer 2

Boolean stores True or False value and 20%10 results in 0 and 0==1 is False so b is False now
and That's ternary operator ? If the condition is true 5 will be the answer otherwise 2
Since b is False the answer will be 2

Answer 3

NIKHIL JOSHI

? with : is called as Ternary operator which is a short form of if else. For example

10 > 5 ? true : false

here 10 > 5 is true so it will print the value before : else will print the value after :

we can write this using if else also:

if(10 > 5) {
//true;
} else {
//false;
}

Answer 4

Thanks to all (Arb Rahim Badsa , 𝐊𝐢𝐢𝐛𝐨 𝐆𝐡𝐚𝐲𝐚𝐥, Abhay, Shivan ~"Rkg" , AJ #Infinity Love )for explaining in such a nice and easy way.