Prva vrednost: <input type="text" name="vrednost1" id="a1"><br>
Druga vrednost: <input type="text" name="vrednost2" id="b1"><br>
<input type="button" id="but1" value="+" onclick="sestej();"><br>


<div id="rezultat"></div>

<br><b>Kalkulator1</b><br><br>

<script type="text/javascript" >
	function sestej() {
	let a = document.getElementById('a1').value;
	let b = document.getElementById('b1').value;
		
	document.getElementById('rezultat').innerHTML = 'Vsota e: ' + (parseInt(a) + parseInt(b));
	
		
	}

</script>


Prva vrednost: <input type="text" name="vrednost1" id="a2"><br>
Druga vrednost: <input type="text" name="vrednost2" id="b2"><br>
<input type="button" id="but1" value="-" onclick="odstej();"><br>



<div id="razlika"></div>

<br><b>Kalkulator2</b><br><br>

<script type="text/javascript" >
	function odstej() {
	let a = document.getElementById('a2').value;
	let b = document.getElementById('b2').value;
		
	let razlika = parseFloat(a)-parseFloat(b);
	
	document.getElementById('razlika').innerHTML = razlika;
	
		
	}

</script>




Prva vrednost: <input type="text" name="vrednost1" id="a3"><br>
Druga vrednost: <input type="text" name="vrednost2" id="b3"><br>
<input type="button" id="but1" value="*" onclick="pomnozi();"><br>



<div id="zmnozek"></div>

<br><b>Kalkulator3</b><br><br>

<script type="text/javascript" >
	function pomnozi () {
	let a = document.getElementById('a3').value;
	let b = document.getElementById('b3').value;
		
	let zmnozek = parseFloat(a)*parseFloat(b);
	
	document.getElementById('zmnozek').innerHTML = zmnozek;
	
		
	}

</script>



Prva vrednost: <input type="text" name="vrednost1" id="a4"><br>
Druga vrednost: <input type="text" name="vrednost2" id="b4"><br>
<input type="button" id="but1" value="/" onclick="deli();"><br>



<div id="kolicnik"></div>

<br><b>Kalkulator4</b><br><br>

<script type="text/javascript" >
	function deli () {
	let a = document.getElementById('a4').value;
	let b = document.getElementById('b4').value;
	
	
	 if (parseFloat(b) === 0) {
            document.getElementById('kolicnik').innerHTML = "Ne morete delit z nulo!!";
        } else {
            let kolicnik = parseFloat(a) / parseFloat(b); 
            document.getElementById('kolicnik').innerHTML = kolicnik;
        }
    }
</script>