        if (elements[i].innerHTML === "รท") {
                        screen.innerHTML  +=  "/ " ;
                }else if(elements[i].innerHTML === "x"){
                            screen.innerHTML += "*";
                    } else{
                        screen.innerHTML  += elements[i].innerHTML;
                    }
                };
            }
            


            clear.onclick = function () {
                screen.innerHTML = '';
            }; 

            functio