Calculator

Tuhin's Calculator

Following are the HTML codes to create Calculator:

<html>
<head>
    <script>
        //function that display value
        function dis(val)
        {
            document.getElementById("result").value+=val
        }
       
        //function that evaluates the digit and return result
        function solve()
        {
            let x = document.getElementById("result").value
            let y = eval(x)
            document.getElementById("result").value = y
        }
       
        //function that clear the display
        function clr()
        {
            document.getElementById("result").value = ""
        }
    </script>
    <!-- for styling -->
    <style>
        .title{
        margin-bottom: 10px;
        text-align:center;
        width: 210px;
        color:green;
        border: solid black 2px;
        }

        input[type="button"]
        {
        background-color:skyblue;
        color: black;
        border: solid black 2px;
        width:100%
        }

        input[type="text"]
        {
        background-color:white;
        border: solid black 2px;
        width:100%
        }
    </style>
</head>
<!-- create table -->
<body>
    <div class = title >Tuhin's Calculator</div>
    <table border="1">
        <tr>
            <td colspan="3"><input type="text" id="result"/></td>
            <!-- clr() function will call clr to clear all value -->
            <td><input type="button" value="c" onclick="clr()"/> </td>
        </tr>
        <tr>
            <!-- create button and assign value to each button -->
            <!-- dis("1") will call function dis to display value -->
            <td><input type="button" value="1" onclick="dis('1')"/> </td>
            <td><input type="button" value="2" onclick="dis('2')"/> </td>
            <td><input type="button" value="3" onclick="dis('3')"/> </td>
            <td><input type="button" value="/" onclick="dis('/')"/> </td>
        </tr>
        <tr>
            <td><input type="button" value="4" onclick="dis('4')"/> </td>
            <td><input type="button" value="5" onclick="dis('5')"/> </td>
            <td><input type="button" value="6" onclick="dis('6')"/> </td>
            <td><input type="button" value="-" onclick="dis('-')"/> </td>
        </tr>
        <tr>
            <td><input type="button" value="7" onclick="dis('7')"/> </td>
            <td><input type="button" value="8" onclick="dis('8')"/> </td>
            <td><input type="button" value="9" onclick="dis('9')"/> </td>
            <td><input type="button" value="+" onclick="dis('+')"/> </td>
        </tr>
        <tr>
            <td><input type="button" value="." onclick="dis('.')"/> </td>
            <td><input type="button" value="0" onclick="dis('0')"/> </td>
            <!-- solve function call function solve to evaluate value -->
            <td><input type="button" value="=" onclick="solve()"/> </td>
            <td><input type="button" value="*" onclick="dis('*')"/> </td>
        </tr>
    </table>
</body>
</html>

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