BigNumber | computing arbitrary-length integers | Math library
kandi X-RAY | BigNumber Summary
kandi X-RAY | BigNumber Summary
BigNumber is a C++ class that allows for the creation and computation of arbitrary-length integers. The maximum possible length of a BigNumber is std::string::max_size.
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QUESTION
solidity newbie here. when I try to read the value of the people array. I'm getting an error:
call to SimpleStorage.people errored: Error encoding arguments: Error: invalid BigNumber string (argument="value" value="" code=INVALID_ARGUMENT version=bignumber/5.4.2)
my compiler version is 0.6.6. not sure what's wrong? any suggestions?
...ANSWER
Answered 2021-Nov-18 at 09:40The error happens when you're trying to call the people() function (from Remix IDE) without passing any value.
Since the People[] public people is a public property, it autogenerates a getter function during compilation. But because it's an array, the getter function requires an uint256 param specifying the index of the array that you want to retrieve.
When you pass an empty string, Remix tries to encode it to the BigNumber instance, but this fails. Only when you pass an (existing) index of the array, it works correctly:
If you want to get the whole array in one call, you need to create a separate getter function:
QUESTION
I have searched all day and still no working solution. My problem is I am working with JavaScript to get EVM blockchain data and any library I use does not work exactly.
...ANSWER
Answered 2022-Mar-16 at 10:36Call Number.MAX_SAFE_INTEGER and you will find max safe integer value. If you go out of this range, math becomes tricky and you probably won't be happy with results.
Your math must stay in the range of max safe integer to have good results.
Read more here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER
You may explore BigInt but it has it's own caveats just like float point numbers.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt
Read more here: https://www.smashingmagazine.com/2019/07/essential-guide-javascript-newest-data-type-bigint/#the-problem
If you found it useful, please consider upvoting/accepting
QUESTION
I'm trying to implement clamp for multiple number-ish types simultaneously like so:
...ANSWER
Answered 2022-Mar-14 at 13:57It may be, or it may be not - you can still pass an argument of number | BigNumber to the function:
QUESTION
I have a local testnet node using Hardhat. I can successfully deploy and test against my contract using plain javascript, async await and const { ethers, upgrades } = require("hardhat");.
I am correctly returning, and printing to the console, a BigNumber array with 2 elements from a contract function.
But the useDapp function call returns a different value.
I have tried everything: JSON.stringify(array) returns [[]], array[0] returns undefined, BigNumber.from(array).toNumber throws some crazy BigNumber error, etc. But I know the contract is giving it the correct values.
Why am I getting 2 different values in 2 different javascript files? I'm assuming it's an issue with the way the hardhat test file is retrieving the values vs. useDapp.
My useDapp front end hook looks like this which returns [Array(0)] with length: 1:
ANSWER
Answered 2022-Mar-12 at 01:33For anyone super confused on this, which I'm sure will be common in the future with EVM smart contract developers, the hardhat default network testing vs testing against a mainnet fork will return different number types from the contract.
For example, using regular .js test files with the default network, returning a uint256[] from the contract will be regular integer looking numbers.
But for the mainnet fork, returning a uint256[] will return a BigNumber array, which javascript has trouble breaking down. You will need a BigNumber package to work with it. It seems the mainnet fork .js interactions require getting the first element of the array Array[0], and inside of that element will be each BigNumber object, which further needs decoded with something like BigNumber.from(yourNumber).toNumber().
Note: as for sending numbers in to the contract, you need to make sure you pay attention to the decimals of a token when dealing with any token values. For example, if a token has 6 decimal places programmed in the contract, and you want to send a value into the contract representing 600 coins, you need to send either 600000000 (600 with 6 0's added) or BigNumber.from(600000000). I am not sure if converting it to a BigNumber type before sending it into the contract saves gas or something, because the conversion is off chain, but it seems you can send either number in to the contract. You just have to make sure you add the 0's to the end of the number according to the token you are working with.
QUESTION
I deployed my solidity smart contract in polygon testnet(mumbai network).
I tested my smart contract works well in my react frontend except one payable function.
ANSWER
Answered 2021-Dec-21 at 02:53Your async lotto function inside of the MarioNFT class does not pass on the options object:
QUESTION
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.12;
struct account{
string _name;
uint _acc_id;
uint balance;
}
contract My_acc{
account public person;
constructor(string memory name, uint acc_id, uint _balance){
person._name = name;
person._acc_id = acc_id;
person.balance = _balance;
}
}
ANSWER
Answered 2022-Mar-08 at 06:37I tried running the same code and it worked just fine.
Constructor runs only once and that is at the time of deployment. Since you are passing the values to constructor, you should pass the values at the time of deployment.
My reputation does not seem to allow me to upload the image. Please go through the link below.
QUESTION
While trying to set up a basic self-hosted unit testing environment (and CI) that tests this Chainlink VRF random number contract, I am experiencing slight difficulties in how to simulate any relevant blockchains/testnets locally.
For example, I found this repository that tests Chainlinks VRF. However, for default deployment it suggests/requires a free KOVAN_RPC_URL e.g. from Infura's site and even for "local deployment" it suggests/requires a free MAINNET_RPC_URL from e.g. Alchemy's site.
I adopted a unit test environment from the waffle framework which is described as:
Filestructure ...ANSWER
Answered 2021-Sep-09 at 04:35to test locally you need to make use of mocks which can simulate having an oracle network. Because you're working locally, a Chainlink node doesn't know about your local blockchain, so you can't actually do proper VRF requests. Note you can try deploy a local Chainlink node and a local blockchain and have them talk, but it isn't fully supported yet so you may get mixed results. Anyway, as per the hardhat starter kit that you linked, you can set the defaultNetwork to be 'hardhat' in the hardhat.config.js file, then when you deploy and run the integration tests (yarn test-integration), it will use mocks to mock up the VRF node, and to test the requesting of a random number. See the test here, and the mock contracts and linktoken get deployed here
QUESTION
I use hardhat to test a solidity contract but I get a different result with functions:
- getUserBalance (contract function)
- balanceOf
ANSWER
Answered 2022-Feb-25 at 07:40This function returns the amount of eth of the _owner.
QUESTION
I'm actually trying to do some unit tests with Hardhat/Ether/Chai, I try to test the balance decrease after a buy.
There is my code :
...ANSWER
Answered 2022-Feb-23 at 15:58The Ethereum balance is expressed as wei units. You need to convert them to human readable decimals to make sense out of them. Ethers library should have an utility function for it, or you can just divide the number with 10 exp 18.
QUESTION
I am trying to Base64 encode an RSA key after converting it to a decimal string in OpenSSL. I am able to encode most of the string, except for the last few characters and I really don't know why. I know there is a one-line function which can do this in EVP, but I already tried it outside of a test program, and I get really strange memory errors.
My code:
...ANSWER
Answered 2022-Feb-11 at 03:36The source of the data to be base64-encoded notwithstanding, a very basic operation that exhibits how it is done is as follows.
- Generate a random block of 256 bytes of data.
- Open a Base64 BIO and configure it.
- Open a basic memory bio
- Chain the aforementioned two bios.
- Write data through the bio chain.
- Flush the bio chain.
- Reap the data from the memory bio.
- Close the full BIO chain.
That's pretty much it. Now the code:
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