25 lines
632 B
Solidity
25 lines
632 B
Solidity
pragma solidity >=0.4.24;
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contract SimpleStorage {
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event ValueChanged(address indexed author, address indexed oldAuthor, string oldValue, string newValue);
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address public lastSender;
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string _value;
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constructor(string memory value) public {
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emit ValueChanged(msg.sender, address(0), _value, value);
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_value = value;
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}
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function getValue() view public returns (string memory) {
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return _value;
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}
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function setValue(string memory value) public {
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emit ValueChanged(msg.sender, lastSender, _value, value);
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_value = value;
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lastSender = msg.sender;
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}
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}
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