Javascript-examples/Quadratic-equation.html at main · darskp/Javascript-examples · GitHub

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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>Quadratic-equation</title>
    <style>
        body{
            padding: 0px;
            margin: 0px;
        }
        .container{
            /* padding: 1px 2px;
            margin: 1px 2px; */
            text-align: center;
        }
        nav{
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: red;
            width: 100%;
            height: 10vh;
        }
        nav h3{
            font-size: 3rem;
            color: white;
            text-shadow: 1px 2px black;
        }
    </style>
</head>
<body>
    <div class="container">
        <nav>
            <h3>Quadratic-equation</h3>
        </nav>

<section>
    <p id="demo"></p>
</section>
    </div>
    <script>
            let root1,root2;
            let a=prompt("enter the coefficients of a");
            let b=prompt("enter the coefficients of b");
            let c=prompt("enter the coefficients of c");
            let d=((b*b)-(4*a*c));
            if (d>0){
                root1=(-b+Math.sqrt(d))/(2*a);
                root2=(-b-Math.sqrt(d))/(2*a);
                // console.log(`root1= ${root1} and root2= ${root2}`);
                document.getElementById("demo").innerHTML=`root1= ${root1} and root2= ${root2}`;
            }
            else if (d==0){
             root1=root2=(-b/(2*a));
            //  console.log(`root1= ${root1} and root2= ${root2}`);
             document.getElementById("demo").innerHTML=`root1= ${root1} and root2= ${root2}`;
            }
            else if (d<0){
                let real=(-b/(2*a)).toFixed(2);
                let img=Math.sqrt(-d)/(2*a);
                let img1=img.toFixed(2);
                //  console.log(`The root1= ${real}+${img1}i and root2= ${real}-${img1}i`);
                document.getElementById("demo").innerHTML=`The root1= ${real}+${img1}i and root2= ${real}-${img1}i`;
            }

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