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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{ 
            background-color: rgb(232, 247, 247);
            box-shadow: bisque;
            height: 280px;
            width : 300px;
            text-align: center;
            border-radius: 30px;
         
            margin: auto;
            margin-top: 100px;
            box-shadow: inset;
        }
        button{
            background-color: rgb(83, 5, 185);
            color: aliceblue;      
        }
    </style>
</head>
<body >


    <script>
        function sum(oper)
        {
         var  a= document.getElementById('id1').value;
         var b= document.getElementById('id2').value;
         switch(oper)
         {
case '+': document.getElementById('result').innerHTML=parseInt(a)+parseInt(b); break;
case '-': document.getElementById('result').innerHTML=parseInt(a)-parseInt(b); break;
case '*': document.getElementById('result').innerHTML=parseInt(a)*parseInt(b);break;
case '/': document.getElementById('result').innerHTML=parseInt(a)/parseInt(b);
         }
        
        }
    </script>
    <div >
    <h1 style="color: lightgreen;">this is form</h1>
    <h3>first name -

   <input id="id1" type="text"> </h3>
    <h3>last name -
    <input id="id2" type="text"> </h3>

    <br>
    <button onclick="sum('+')">add</button>
    <button onclick="sum('-')">sub</button>
    <button onclick="sum('*')">mul</button>
     <button onclick="sum('/')">div</button> 


    <h1 id="result"> result:     </h1>
    </div>
</body>
</html>
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