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// SPDX-License-Identifier: GPL-3.0 | ||
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pragma solidity >=0.7.0 <0.9.0; | ||
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/** | ||
* @title Storage | ||
* @dev Store & retrieve value in a variable | ||
*/ | ||
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contract Storage { | ||
uint256 number; | ||
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event storedNumber( | ||
address indexed _from, | ||
uint256 indexed _oldNumber, | ||
uint256 indexed _number | ||
); | ||
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/** | ||
* @dev Store value in variable | ||
* @param num value to store | ||
*/ | ||
function store(uint256 num) public { | ||
uint256 old = number; | ||
number = num; | ||
emit storedNumber(msg.sender, old, num); | ||
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} | ||
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/** | ||
* @dev Return value | ||
* @return value of 'number' | ||
*/ | ||
function retrieve() public view returns (uint256) { | ||
return number; | ||
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} | ||
} |
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