Examples of solidity ^0.5.1

helloworld.sol

pragma solidity ^0.5.1; // (1) Version pragma

contract Helloworld {
    // 문자열 멤버 변수
    string public greeting;
    
    // memory 키워드가 반드시 있어야 한다.
    // greeting 멤버 변수를 초기화
    function setGreeting(string memory _greeting) public {
        greeting = _greeting;
    }
    
    // greeting 을 반환
    function say() public view returns(string memory) {
        return greeting;
    }
}

yes24coin.sol

pragma solidity ^0.4.8;

contract Yes24Coin {
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public totalSupply;
    
    mapping(address => uint256) public balanceOf; 
    
    // Event
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    // Constructor
    function Yes24Coin(uint256 _supply, string _name, string _symbol, uint8 _decimals) {
        balanceOf[msg.sender] = _supply;
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        totalSupply = _supply;
    }
    
    function transfer(address _to, uint256 _value) {
        // Check 
        if (balanceOf[msg.sender] < _value) throw;
        if (balanceOf[_to] + _value < balanceOf[_to]) throw;
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        Transfer(msg.sender, _to, _value);
    }
}