Discussions Q&R

What's so bad about null? Why is it called the "billion dollar mistake"?

23rd May 2020, 11:53 AM

Lalis

c java null

3 Votes

What does java return if nothing is entered in scanner?

7th May 2020, 3:04 AM

SapphireBlue

java null scanner

12 Votes

Why does it end with "none"?

26th Mar 2017, 3:48 AM

Siddharth Saraf

help none null

0 Vote

7 Réponses

7th Feb 2020, 10:36 PM

MyNameIsMutable

what is the effect of passing of NULL pointer(0) to delete pointer ? pls ans me

c++

1 Vote

I created spy life program but it has wrong output, null should not be in output, how to avoid it

8th Aug 2016, 6:06 PM

Santhosha S R

beginner coadcoach help java spylife

3 Votes

What is string literal? Null character '\0'. What about slash zero. (\0)? How its work ? Tell me info. About that.

22nd Jul 2020, 6:17 AM

Pratik Shinde

c string

1 Vote

7 Réponses

13th Nov 2020, 3:32 PM

SARVESH ASHOK DEVRUKHAKAR

When a string ends '\0' (null) gets added at its end but does it also gets added at the end of an array if not then what ?

array null strings

3 Votes

why is this throwing an error in js? var output =document.querySelector("#output"); output.innerHTML="Hello world"; reference error of output.innerHTML null line 2

5th Apr 2018, 6:30 AM

Rishu Kumar

javascript

5 Votes

Why is it good practice to assign NULL to a pointer when declaring it?

29th Sep 2016, 2:27 PM

Abdoulaye Seck

c++pointers

0 Vote

31st Jul 2016, 7:13 PM

Awni

Why this error?

error javascript null

0 Vote

How'd do you call elements in JavaScript here in sololearn??Everytime I use query selector it returns null

13th Feb 2021, 1:13 PM

Technical Code

<button

0 Vote

Why is my code not going through? it's indicating >>> uncaught TypeError! cannot read property 'getContext' of null line: 5

16th Jul 2023, 12:46 PM

Indiphile Menziwa

development game javascript with

0 Vote

5 Réponses

30th Dec 2021, 5:28 PM

Abraham Zimba

How it works? Can we say that \n is short for null and \t is short for tab?

0 Vote

How to add arithmetic symbols like +,-,×,÷,% in the output(print) of the python program like as in c++ '/÷' A null character ???

14th May 2022, 7:35 AM

‎أندريه‎

c c++python

8 Votes

5 Réponses

21st May 2018, 5:12 PM

Arvind Raj

How can I access user in the constructor of parent controller laravel 6? The Auth::user() == null

laravel php

1 Vote

Please what can be the problems my code it keeps giving me can't set property of 'className' null

10th Aug 2020, 10:04 AM

Abdessamad Ait Si Bella

javascript

1 Vote

Why ZERO in integer array in C++ is considered as NULL?

20th Dec 2018, 5:47 AM

Reward

c++null nullptr

1 Vote

update a data in mysql, adding data to a null column of an existing row. is it possible?

29th Jan 2021, 2:05 PM

Ayush Dubey

c#mysql sql

0 Vote

Uncaught Type Error : cannot read property of 'addEventListener' of Null line : 5 . In my code check the code

6th Oct 2019, 2:58 AM

zekrom

javascript node.js

1 Vote

What exactly does this mean --> Time(NULL)

16th Feb 2020, 6:07 AM

Hari kanani

c++null

0 Vote

4th Nov 2016, 7:40 AM

Jenilyn Salonga

Tricky null?

javascript null

0 Vote

Why, using same String name variable in every class gives the name null except the last child class ( cinematographer)?

16th Sep 2017, 2:47 PM

Siroj Samadov

childclass derivedclass inheritance java parentclass string superclass variables

0 Vote

I am trying to select HTML elements using document.getElementById method but it keep showing null reference. how to fix it?

12th Mar 2020, 2:50 PM

Rohan c

web

0 Vote

What is the NULL and RESOURCE data type used for and how do I declare it?

11th Apr 2019, 12:56 PM

Vivek

php

0 Vote

How to add multiple values in an existing new coloumn where there were already null values present in SQL …

9th Dec 2016, 10:59 AM

Tukele Osareme C

help sql

1 Vote

Why don't i run a to-do app. When i want to run that program, it says "addEventListener" has null property. Please help.

16th Apr 2020, 5:32 PM

Naveen

bootstrap css3 html5 javascript node.js

1 Vote

[SOLVED] Why 'null >= 0' is TRUE?

13th Dec 2020, 10:01 PM

meherDev

0 comparison javascript null

3 Votes

Why did not earth end on december 12?

30th Apr 2024, 6:21 AM

`ᴴᵗᵗየ

dest earth null void

0 Vote

12 Réponses

19th May 2017, 6:54 AM

Code Master

in case the input was null for a column NOT NULL..an error will appear or what ?

sql tables

1 Vote

If i make multiple null statements in c++, with no reason, does this affects in the execution time for the compiler?

17th Jun 2017, 12:29 AM

De Vinci

c++

2 Votes

When declaring a pointer to a variable, do we need to initialize to NULL all the time? Why?

9th Aug 2017, 2:14 PM

Çůřîöş ßąšäñț 🇮🇳

c null pointer

1 Vote

30th Dec 2018, 8:46 AM

Konybud

JS error to fix ...

error javascript null var

5 Votes

How can i make a paragraph or text clear in javascript?

25th Apr 2019, 1:29 PM

Jess

dom innerhtml null type-error

8 Votes

In creat table statment how one can define a variable as unique and not null as well in sql

7th Apr 2017, 7:29 PM

Yazdan Hamidi

mysql sql

0 Vote

5th Jul 2019, 9:40 AM

priya

None and null?

none null python

0 Vote

Hey guys , how to check if an element in an array of integer is empty? Is it equal to null or 0?

11th May 2018, 9:56 AM

Yugabdh

java

1 Vote

What's the difference between an empty string and a null string? And both of them will have an address in the memory?

3rd Apr 2020, 4:37 PM

David Bukedi Diela

empty java memory null strings

1 Vote

JavaScript Daily Challenge How? ANYONE?

23rd Jan 2020, 4:02 PM

Hichem GOUIA

how javascript null output undefined

8 Votes

12 Réponses

19th Aug 2017, 12:15 AM

¤ rookie ¤

why I'm getting this error in js console... in where other editor can play this without error.. but solorlearn is giving me erro

addeventlistener null of property

1 Vote

6 Réponses

20th Jun 2020, 5:55 AM

Moshiur Rahman Rony

I want tolowercase() to convert values and also ignore null values in a list. What to do ?

javascript

0 Vote

what is Unable to get property 'style' of undefined or null reference error and why am i getting it often

19th Sep 2019, 9:23 AM

Yasik Raam

html javascript problem

0 Vote

guys i've got a problem in android studio evrytime when i try to create a avd it says null pointer exception null and even the stand alone sdk manager doesnt open due to this exception any solution would be greatly appreciated thanks..

27th May 2017, 3:51 PM

_Retr0/-

java

1 Vote

How to stop getting an error for not having a value?

22nd Jul 2016, 7:02 AM

Suhail Pappu

error javascript null type-error

0 Vote

6 Réponses

20th Nov 2018, 10:34 PM

Yosharu

select name,year from books where year >1990 union all select name, null as year from new; please give me the answer

union

0 Vote

Is there any way to set CORS policy to null when loading images in sololearn? can javascript do it?

24th Sep 2023, 12:31 PM

selva kumar

cors policy programming server sided web

0 Vote

16th May 2017, 7:46 PM

Miłosz Szatkowski

Exactly what is Null?

c#c++java null

5 Votes

What's the problem in this code?

28th Nov 2017, 9:03 AM

Yaseen Akbari

class code java null

1 Vote