index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>calculator with single btn</title>
    <link rel="stylesheet" href="style.css">

</head>
<body>
    <div class="container">
        <h2>CALCULATOR</h2>
        <div class="calc-body">
            <div class="top"> 
                <div><input type="text" id="input1" placeholder="GIVE YOUR FIRST VALUE:"></div>
                <div><input type="text" id="input2" placeholder="GIVE YOUR LAST VALUE:"></div>
                <div >
                    
                    <button class="btn1" onclick="toPlus()">+</button>
                    <button class="btn2" onclick="toMinus()">-</button>
                    <button class="btn3" onclick="toMult()">x</button>
                    <button class="btn4" onclick="toDiv()">/</button>
                    <!-- //<button onclick="toAll()">submit</button> -->
                    

                </div>
            </div>
            <div class="bottom">
                   <h3>result</h3>
                   <p id="result">0</p>
            </div>
        </div>
    </div>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="script.js"></script>
</body>
</html>