问题描述
我想在我的代码中加入转移税,但不知道如何去做。我会对买卖征收 2.5% 的税。任何帮助/建议将不胜感激。这是我目前所拥有的:
pragma solidity ^0.8.4;
contract Token {
mapping(address => uint) public balances;
mapping(address => mapping(address => uint)) public allowance;
uint public totalSupply = 100000000000 * 10 ** 18;
string public name = "*****";
string public symbol = "****";
uint public decimals = 18;
event Transfer(address indexed from,address indexed to,uint value);
event Approval(address indexed owner,address indexed spender,uint value);
constructor(){
balances[msg.sender] = totalSupply;
}
function balanceOf(address owner) public view returns(uint){
return balances[owner];
}
function transfer(address to,uint value) public return(bool){
require(balanceOf(msg.sender) >= value,'balance too low');
balances[to] += value;
balances[msg.sender] -= value;
emit Transfer(msg.sender,to,value);
return true;
}
function transferFrom(address from,address to,uint value) public returns(true){
require(balanceOf(from) >= value,'balance too low');
require(allowance[from][msg.sender] >= value,'allowance too low');
balances[to] +=value;
balances[from] -= value;
emit Transfer (from,value);
return true
}
function approve (address spender,uint value) public reutrns(bool) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender,spender,value);
return true;
}
}
解决方法
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