How to check whether a uint256 is null in solidity?











up vote
2
down vote

favorite












I want to check whether a uint256 variable is null. How can I do so in solidity?






solidity







share|improve this question


















  • 2




    You can check it by comparing with 0
    – A.K.
    22 hours ago















up vote
2
down vote

favorite












I want to check whether a uint256 variable is null. How can I do so in solidity?






solidity







share|improve this question


















  • 2




    You can check it by comparing with 0
    – A.K.
    22 hours ago













up vote
2
down vote

favorite









up vote
2
down vote

favorite











I want to check whether a uint256 variable is null. How can I do so in solidity?






solidity







share|improve this question













I want to check whether a uint256 variable is null. How can I do so in solidity?






solidity




solidity






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 22 hours ago









Rohan Dhar

1217




1217








  • 2




    You can check it by comparing with 0
    – A.K.
    22 hours ago














  • 2




    You can check it by comparing with 0
    – A.K.
    22 hours ago








2




2




You can check it by comparing with 0
– A.K.
22 hours ago




You can check it by comparing with 0
– A.K.
22 hours ago










1 Answer
1






active

oldest

votes

















up vote
4
down vote



accepted










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.






share|improve this answer





















  • Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
    – Paul Berg
    7 hours ago











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',
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
});


}
});














 

draft saved


draft discarded


















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








up vote
4
down vote



accepted










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.






share|improve this answer





















  • Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
    – Paul Berg
    7 hours ago















up vote
4
down vote



accepted










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.






share|improve this answer





















  • Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
    – Paul Berg
    7 hours ago













up vote
4
down vote



accepted







up vote
4
down vote



accepted






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.






share|improve this answer












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.







share|improve this answer












share|improve this answer



share|improve this answer










answered 22 hours ago









Tudor Constantin

1,770212




1,770212












  • Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
    – Paul Berg
    7 hours ago


















  • Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
    – Paul Berg
    7 hours ago
















Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
7 hours ago




Indeed, but I'd add that integers do not normally have nulls in any programming language. They are primitives.
– Paul Berg
7 hours ago


















 

draft saved


draft discarded



















































 


draft saved


draft discarded














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





















































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







-

Popular posts from this blog

Costa Masnaga

Image
.mw-parser-output .avviso .mbox-text-div>div,.mw-parser-output .avviso .mbox-text-full-div>div{font-size:90%}.mw-parser-output .avviso .mbox-image div{width:52px}.mw-parser-output .avviso .mbox-text-full-div .hide-when-compact{display:block} Questa voce o sezione sull'argomento Lombardia non cita le fonti necessarie o quelle presenti sono insufficienti . Puoi migliorare questa voce aggiungendo citazioni da fonti attendibili secondo le linee guida sull'uso delle fonti. Segui i suggerimenti del progetto di riferimento. Costa Masnaga comune Localizzazione Stato   Italia Regione Lombardia Provincia Lecco Amministrazione Sindaco Sabina Panzeri (Al centro il cittadino) dall'08/06/2009 Territorio Coordinate 45°46′N 9°17′E  /  45.766667°N 9.283333°E 45.766667; 9.283333  ( Costa Masnaga ) Coordinate: 45°46′N 9°17′E  /  45.766667°N 9.283333°E 45.766667; 9.283333  ( Costa Masnaga ) Altitudine 318 m s.l.m...
Read more

Fotorealismo

Image
Guerrino Boatto, Venice's St. Barnaba Church and canal Il fotorealismo è un genere di pittura basato sull'uso di una o più fotografie dalle quali l'artista prende le informazioni necessarie da utilizzare poi nel processo della creazione dell'opera, in genere ad olio o ad acrilico, al fine di avere un aspetto finale il più simile possibile alla fotografia. Indice 1 Storia 2 Lista dei fotorealisti 3 Note 4 Voci correlate 5 Altri progetti Storia | Il fotorealismo è un movimento che nasce negli Stati Uniti d'America alla fine degli anni sessanta [1] sulla scia della Pop Art [2] [3] [4] , e insieme condividono il carattere reazionario verso la travolgente ascesa dei media, che alla metà del ventesimo secolo si trasforma in un fenomeno di massa talmente imponente da minacciare il valore dell'immagine nell'arte. [5] [6] Ne consegue così che, colto il gesto d'inizio che fu della Pop Art, i fotorealisti aprono ad un ...
Read more

Sidney Franklin

Image
Questa voce sull'argomento registi statunitensi è solo un abbozzo . Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Sidney Franklin, foto di Carl Van Vechten Oscar alla memoria Irving G. Thalberg 1943 Sidney Franklin , all'anagrafe Sidney Arnold Franklin , (San Francisco, 21 marzo 1893 – Santa Monica, 18 maggio 1972), è stato un regista, produttore cinematografico e attore statunitense. Il 20 giugno 1963, si sposò con l'attrice australiana Enid Bennett. Il matrimonio durò fino alla morte dell'attrice, il 14 maggio 1969 [1] Indice 1 Filmografia 1.1 Regista 1.2 Aiuto regia (parziale) 1.3 Produttore 1.4 Attore (parziale) 2 Note 3 Altri progetti 4 Collegamenti esterni Filmografia | Regista | The Baby , co-regia Chester M. Franklin (1915) The Rivals , co-regia Chester M. Franklin (1915) Little Dick's First Case , co-regia Chester M. Franklin (1915) Her Filmland Hero , co-...
Read more