41 lines
1.0 KiB
Solidity
41 lines
1.0 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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contract MyContract {
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address public owner;
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uint256 public price;
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event Purchase(address buyer, uint256 amount);
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constructor() {
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owner = msg.sender;
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price = 0.01 ether; // Начальная цена 0.01 ETH
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}
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modifier onlyOwner() {
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require(msg.sender == owner, "Only owner can call this function");
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_;
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}
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function setOwner(address newOwner) public onlyOwner {
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require(newOwner != address(0), "New owner cannot be zero address");
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owner = newOwner;
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}
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function setPrice(uint256 newPrice) public onlyOwner {
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price = newPrice;
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}
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function getPrice() public view returns (uint256) {
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return price;
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}
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function purchase(uint256 amount) public payable {
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require(msg.value == price * amount, "Incorrect payment amount");
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emit Purchase(msg.sender, amount);
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}
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function withdraw() public onlyOwner {
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payable(owner).transfer(address(this).balance);
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}
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} |