张士玉小黑屋

#include<iostream>usingnamespacestd;classPoint{private:   intm_X;   intm_Y;public:   voidsetX(intx)   {      m_X=x;   }   voidsetY(inty)   {      m_Y=y;   }   intgetX()   {      returnm_X;   }   intgetY()   {      returnm_Y;   }};classCircle{pri

 //SPDX-License-Identifier:MIT pragmasolidity^0.8.3;  contractContractBalanceTest{   addresspublicowner;    constructor()publicpayable{     owner=msg.sender;   }    modifieronlyOwner(){    require(msg.sender==owner,"Thiscanonlybecalledbythecontractowner!")