How to check whether a uint256 is null in solidity?
I want to check whether a uint256 variable is null. How can I do so in solidity?
solidity
asked Nov 21 at 8:01
Rohan Dhar
25910
add a comment |
I want to check whether a uint256 variable is null. How can I do so in solidity?
solidity
asked Nov 21 at 8:01
Rohan Dhar
25910
2
You can check it by comparing with 0
– Aniket
Nov 21 at 8:09
add a comment |
I want to check whether a uint256 variable is null. How can I do so in solidity?
solidity
asked Nov 21 at 8:01
Rohan Dhar
25910
I want to check whether a uint256 variable is null. How can I do so in solidity?
solidity
solidity
asked Nov 21 at 8:01
Rohan Dhar
25910
asked Nov 21 at 8:01
Rohan Dhar
25910
asked Nov 21 at 8:01
Rohan Dhar
25910
asked Nov 21 at 8:01
Rohan Dhar
25910
asked Nov 21 at 8:01
Rohan Dhar
25910
25910
2
You can check it by comparing with 0
– Aniket
Nov 21 at 8:09
add a comment |
2
You can check it by comparing with 0
– Aniket
Nov 21 at 8:09
2
2
You can check it by comparing with 0
– Aniket
Nov 21 at 8:09
You can check it by comparing with 0
– Aniket
Nov 21 at 8:09
add a comment |
1 Answer
1
active
oldest
votes
There aren't any things like null in solidity.
All the uninitialized variables are set to a zero like value.
Have a look at this answer for more examples.
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
1
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "642"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f62755%2fhow-to-check-whether-a-uint256-is-null-in-solidity%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
There aren't any things like null in solidity.
All the uninitialized variables are set to a zero like value.
Have a look at this answer for more examples.
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
1
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
add a comment |
There aren't any things like null in solidity.
All the uninitialized variables are set to a zero like value.
Have a look at this answer for more examples.
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
1
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
add a comment |
There aren't any things like null in solidity.
All the uninitialized variables are set to a zero like value.
Have a look at this answer for more examples.
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
There aren't any things like null in solidity.
All the uninitialized variables are set to a zero like value.
Have a look at this answer for more examples.
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
answered Nov 21 at 8:09
Tudor Constantin
1,9731212
1,9731212
1
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
add a comment |
1
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
1
1
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
Nov 21 at 23:10
add a comment |
Thanks for contributing an answer to Ethereum Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fethereum.stackexchange.com%2fquestions%2f62755%2fhow-to-check-whether-a-uint256-is-null-in-solidity%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
You can check it by comparing with 0
– Aniket
Nov 21 at 8:09