오버라이딩

 

contract Father{
	constructor(string memory _givenName){
    	givenName = _givenName;
    }
	string public familyName = "Lee";
    string public givenName = "Dae";
    uint256 public money = 100;
    
    function getFamilyName() view public returns(string memory){
    	return familyName;
    }
    
    function getGivenName() view public returns(string memory){
    	return givenName;
    }
    
    function getMoney() view virtual public returns(uint256){
    	return money;
    }
}


contract Son is Father { //생성자를 이용하여 아들이름 변경

	constructor() Father("Yong"){
    
    }

	uint256 public earning = 0;
    function work() public {
    	earning += 100;
    }
	function getMoney() view override public returns(uint256){
    	return money + earning ;
    }
}