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Calculation of fees for various decimal in Ethereum
While moving around the world of decentralized finances (DEFs) and transactions between the chain, management of fees is becoming more and more important. One of the key aspects is the calculation of the right fee for various decimal tokens used in your applications.
In this article, we will examine how to create a general solution for calculating fees for various decimal tokens at Ethereum.
Understanding decimals
Before immersing in the code, let's briefly discuss what decimals mean. The decimal token represents a unit of a specific resource or currency with a fractional part (e.g. 6 decreases: 1,000000) instead of integers (as USDC has 10 decimal decimals: 1,000000).
Ethereum token standard
Ethereum, as a blockchain -based platform, uses its own standard to tokens to tokens. According to the Ethereum Foundation, the token may have any number of decimal places he wants, but there are some restrictions.
* Maximum decimal places : each type of token (e.g. USDC, DAI) has a maximum of 20 decimal seats.
* The size of the token : The total value of each token is limited to the maximum decimal places of the maximum size of the token (in WeI).
* Minimum and maximum sizes of tokens : Most tokens have a minimum size of the 18.75 WEI token (or 1 ether) and the maximum size of the token 10^20 wei.
Calculation of fees
To calculate the fees for various decimal tokens, you must consider the following factors:
- Type of token : Each token has its own set of rules for decimal places.
- Maximum decimal places : The highest number of decimal places allowed for a given token.
- Minimum and maximum dimensions of tokens : the smallest and largest values that can be represented by each token.
- fractional value : For tokens with fractional parts (like USDC), you must calculate the correct fractional value.
Here is an example fragment of the code in reliability, programming language used for Ethereum contracts:
`` Solidity
Pragma solidity ^0.8.0;
contract Decimaltokencalculator {
// Define mapping of types of tokens and their appropriate decimal places
mapping (address => mapping (address => uint256)) public tokendecimalplaces;
// function to set the number of decimal places for a given token type
function Setdecimalplacecount (address _tken, uint256 _decimalplaces) public {
requires (_decimalplaces <= 20, "incorrect number of decimal places");
Requires (tokeDecimalplaces [_token] == 0 || tokedecimalplaces [_token] .length <_decimalplaces, "the token has already been counted in mapping");
// Set a new number of decimal places for a given token type
if (tojndecimalplaces [_token] .length> 0) {
Remove the tokendecimalPlaces [_token];
}
toocimalplaces [_token] = table (_decimalplaces);
}
// The function of calculating the correct fractional value of a given token
function GetfracTIONALVALUE (address _TOKEN, UINT256 _AMOUNT) Public View Returns (Uint256) {
requires (tokenecimalplaces [_token] [0] == 0 || tokendecimalplaces [_token] .length> = 20, "token there are no decimal places");
Return (_amount / Uint256 (1 << TondecimalPlaces [_token] [0]));
}
// Function to calculate the fee for a given transaction
The function is calculated (address _ from, address _to, uint256 _amount) Public Returns (Uint256) {
// Suppose we have a number of types of tokens with the number of decimal places and maximum sizes
Token [] public token = new token [] (5);
tokens [0]. Tokentype = "USDC";
tokens [1]. Tokentype = "dai";
tokens [2]. Tokentype = "ETH";
tokens [3]. Tokentype = "wbnb";
// Calculate the fee for each token type
Uint256 [] Public fees = new Uint256 [Tokens.length];
for (uint256 i = 0; and <tokens.
