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<!DOCTYPE html>
<html>
<head>
   <meta charset="utf-8">
   <style>
     button {
	   font-size:120%;
	   margin:10px;
	 }
   </style>
</head>
<body>

    <h1> Αριθμομηχανή με JavaScript </h1>


    Αριθμός 1 : <input type="number" id="num1" value=""> <br><br>
	Αριθμός 2 : <input type="number" id="num2" value=""> <br><br>

    <button onclick="mysum()"> + </button>
	<button onclick="aferesi()"> - </button>
	<button onclick="poll()"> * </button>
	<button onclick="dieresi()"> / </button>

	<h2 id="result"></h2>

<script>
     var myNum1 = document.getElementById("num1");
	 var myNum2 = document.getElementById("num2");
	 var myResult= document.getElementById("result");


	 function mysum()
	 {
	   a1=Number(myNum1.value);
	   a2=Number(myNum2.value);
	   b=a1+a2;
	   myResult.innerHTML="Το άθροισμα είναι "+b;
	 }

	  var myNum1 = document.getElementById("num1");
	 var myNum2 = document.getElementById("num2");
	 var myResult= document.getElementById("result");


	 function aferesi()
	 {
	   a1=Number(myNum1.value);
	   a2=Number(myNum2.value);
	   b=a1-a2;
	   myResult.innerHTML="Το άθροισμα είναι "+b;
	 }

	  var myNum1 = document.getElementById("num1");
	 var myNum2 = document.getElementById("num2");
	 var myResult= document.getElementById("result");


	 function poll()
	 {
	   a1=Number(myNum1.value);
	   a2=Number(myNum2.value);
	   b=a1*a2;
	   myResult.innerHTML="Το άθροισμα είναι "+b;
	 }

	 var myNum1 = document.getElementById("num1");
	 var myNum2 = document.getElementById("num2");
	 var myResult= document.getElementById("result");


	 function dieresi()
	 {
	   a1=Number(myNum1.value);
	   a2=Number(myNum2.value);
	if (a2==0) {
		myResult.innerHTML="H διαιρεση ειναι Αδυνατη"; }
	else
		 { b=a1/a2;
	   myResult.innerHTML="Το άθροισμα είναι "+b; }
	 }

</script>
</body>
</html>