声明错误：未找到标识符或标识符不唯一。 mapping(address=> mapping(address=>uint265)) 公共津贴；答案

【问题标题】：DeclarationError: Identifier not found or not unique. mapping(address=> mapping(address=>uint265)) public allowance;声明错误：未找到标识符或标识符不唯一。 mapping(address=> mapping(address=>uint265)) 公共津贴；
【发布时间】：2021-10-14 17:15:43
【问题描述】：

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pragma solidity ^0.5.0;

contract Tether {
string public name = 'Tether';
string public symbol = 'USDT';
uint256 public totalSupply = 1000000000000000000000000;
uint8 public decimals = 18;

event Transfer(
    address indexed _from,
    address indexed _to,
    uint256 _value
);

event Approval(
    address indexed _owner,
    address indexed _spender,
    uint _value
);
mapping(address=>uint256) public balanceOf;
mapping(address=> mapping(address=>uint265)) public allowance;

constructor() public {
    balanceOf[msg.sender] = totalSupply;
}

function transfer(address _to,uint256 _value) public returns (bool success){
    require(balanceOf[msg.sender]>= _value);
    balanceOf[msg.sender] -= _value;
    balanceOf[_to]+=_value;
    emit Transfer(msg.sender, _to, _value);
    return true;
}
function approve(address _spender,uint256 _value) public returns(bool success) {
    allowance[msg.sender][_spender] =_value;
    emit Approval(msg.sender,_spender, _value);
    return true;
}

function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
    require(_value <= balanceOf[_from]);
    require(_value <= allowance[_from][msg.sender]);
    balanceOf[_to]+=_value;
    balanceOf[_from] -= _value;
    allowance[_from][msg.sender] -= _value;
    emit Transfer(_from, _to, _value);
    return true;    
}

}

我发现了错误

DeclarationError: Identifier not found or not unique.

mapping(address=> mapping(address=>uint265)) 公共津贴；

请帮我解决错误。

【问题讨论】：

标签： solidity contract

【解决方案1】：

这很可能是由拼写错误引起的 - 没有 265 bit unsigned integer 这样的东西（但有 256 位）。

将uint265 替换为uint256。

【讨论】：