Plz explain the code | I couldn't understand

Question

#include <iostream>
using namespace std;

int main()
{
int num = 1 ;
while (num<=20) {
if (num % 3 == 0) {
cout << num << endl ;
}
num+=1;
}

return 0;
}

Answer 1

int num = 1 ; // assign num to 1

// loop runs until num<=20 is true
while (num<=20) {

// inside if num is divisable by 3 then output num value , add line end.

if (num % 3 == 0) {
cout << num << endl ;
}
// increment num value by 1
num+=1;

// repeat this until condition false
}

So that code outputs :
3,6,9,12,15,18 in between of 1 to 20 .

Hope it helps..

Answer 2

First the num variable is assigned to 1
Then using a while loop untill the number is <=20 the will work
If the number is divide by 3 and the remainder is 0 display the number then increase the value of num by one

Answer 3

Why num is assign to 1 and not 0

Yes. You can assign. then it output 0 also
Since 0%3 == 0

If 3 is divisible by 3 then why it is == 0 ?

3 is divisible by 3 then ,reminder is 0 so 3%3 must equal to 0
Look 1%3 == 0 false
2%3 == 0 false
3%3 == 0 is true
6%3 == 0 is true
== is equality comparision operator.
Returns true is equal. Otherwise returns false.

Increment num value meaning ? :

num+= 1 increment by 1 means , 1 is added to num so it gives you next number like 2,3,4,5,....

Answer 4

If you assign the num = 0 then the your while loop run like this:-
while(0<=20)//because num value=0
// And the while loop will run until 20
If(num%3==0)
// % :- means modulas operator means it gives remainder value
// ==:- means compared the value like 2==2 , means 2 is equal to 2
//Now, (num%3==0) means when num any value divide by 3 like 3%3==0, means if you divide 3 by 3 then the remainder is 0 now 0==0 yes, then if condition is true

I hope it's clear to you

Answer 5

Why num is assign to 1 and not 0
If 3 is divisible by 3 then why it is == 0
Increment num value meaning ?

Answer 6

int num means num is the variable and it store int data type
And
num increment means it's increament the value like you write num+=1 it's meaning is num = num +1
You directly write like this:-
num = num + 1
and your statement is also correct

Answer 7

Thank you so much sir 💗 You are now my permanent mentor

Answer 8

Thanks you Shakshi Mam

Answer 9

Sakshi not Shakshi 😅, btw welcome.

Answer 10

Thanks Tesfaye Sir

Answer 11

You added 3 to every number. Yay best explain

Answer 12

THANKS YOU HRITIK BHAIYA

Answer 13

But I know this