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Results tagged with solidity
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user 52
Solidity is a contract-oriented, high-level language whose syntax is similar to that of JavaScript and it is designed for writing smart contracts in Ethereum to run on the EVM. Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.
60
votes
Accepted
Is the block.timestamp value in Solidity seconds or milliseconds?
From the Solidity documentation (here and here):
... timestamp of the current block in seconds since the epoch
For your other question:
Also, is it safe to use block.timestamp to check if 30 …
- 38k
47
votes
Accepted
What is the difference between `now` and `block.timestamp`?
From the documentation:
now (uint): current block timestamp (alias for block.timestamp)
Update: (Thanks @ShaneFontaine)
Solidity 0.7.0 deprecated the now keyword. …
- 38k
43
votes
Accepted
Visibility for constructor is ignored. If you want the contract to be non-deployable, making...
This is saying that adding public - a visibility specifier - to a constructor has no effect.
Constructors are run only once, when the contract is initially deployed. They can't be called at a later ti …
- 38k
33
votes
Accepted
What is uint256?
With regard to Solidity...
This is really more a general computer science question that would best be answered on Stack Overflow.
At the risk of repeating what @Ismael has linked to... …
- 38k
32
votes
Accepted
Error while compiling: Stack too deep
The Solidity code doesn't appear to be consistent in the number of variables it sees as a problem, but you've got a limit of around 16 or 17. … Edit 2019:
A very detailed explanation of this error, and how it can be avoided, is discussed in the article “Stack Too Deep”- Error in Solidity. …
- 38k
30
votes
Accepted
Can I square root in Solidity?
An implementation of a square root function was added to the dapp-bin as part of a maths library a while back.
Have a look at PR#50 (which is actually still open). I think the discussions boil down t …
- 38k
21
votes
Accepted
What uint type should be declared for unix timestamps?
Not really an answer to what you're asking, but...
Decreasing the size of a uint to less that 256 bits will increase the associated gas costs, not decrease it like you might be expecting. It'll be be …
- 38k
19
votes
Meaning of 'using SafeMath for uint256;'
using ... for ... is explained in Solidity's documentation, here, and is a way to attach library functions to a given type.
So in your case:
using SafeMath for uint256;
...means that the functions …
- 38k
16
votes
3
answers
5k
views
What is formal verification, and why is it important for smart contracts?
"Formal verification" has appeared in various previous questions and answers, and I believe was the topic for one of the talks at DevCon2.
Main question: It's perhaps quite broad, but what is formal …
- 38k
13
votes
Accepted
Control Structures- why is switch and goto not in Solidity?
Solidity isn't Javascript. Neither of them are there.
switch offers nothing more than a convenient if...else shortcut. I don't know why it wan't implemented in Solidity. …
- 38k
12
votes
Accepted
ProviderError: max code size exceeded
How can I adjust the code size or any other method to resolve this error.
The contract code size limit is 24kB (24,576 bytes).
You'll need to reduce the size of the contract before deploying, or spl …
- 38k
11
votes
Accepted
Why did Serpent die?
The
creator recommends Solidity as a default choice, LLL if you want
close-to-the-metal optimizations, or Viper if you like its features
though it is still experimental. …
- 38k
11
votes
Accepted
Where solidity files are stored in Remix IDE
The key is the name of the file, the value is the contents (i.e. the Solidity code). …
- 38k
11
votes
Convert wei to ether in contract
The base unit for currency in Solidity is Wei. That means if you're dealing with balances, and you don't specify a unit, then it defaults to Wei. …
- 38k
11
votes
Accepted
How to pass struct params in remix ide?
Your function takes an array of structures as an argument:
- 38k