function Okclick(clicked) {
  var num = document.getElementById("textFieldNum").value
  var num2 = document.getElementById("textFieldNum2").value
  var id = clicked;
  var argument = "";
  if(id == "1"){
    argument = ("calculateSquare?num=" + num +"&step=" + num2);
  }
  else if (id == "2"){
    argument = ("calculateFactorial?num=" + num);
  }
  else if( id == "3"){
    argument = ("calculateFibbN?num=" + num);
  }
  else if (id == "4"){
    argument = ("calculateLastSimple?num=" + num);
  }

  fetch ("http://127.0.0.1:8080/" + argument)
  .then(response => response.text())
   .then((response) => {
       console.log(response)
       document.getElementById("res").innerHTML = response
   })
  
}