javascript-exercises/Exercise20.html at master · DanyST/javascript-exercises · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Exercise 20</title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>
    <body>
        <script type="text/javascript">
            // Crear un programa que escriba la suma de los números del 1 a N, donde N será dado por el usuario.

            let finalNumber = parseInt(prompt('sumar de 1 al :'));
            let sum = 0;
            let message = new Array()

            for(let i = 1; i <= finalNumber; i++) {
                message.push(i);
                sum += i;
            }
            message = message.join(' + ')
            alert(`${message} = ${sum}`);
        </script>
    </body>
</html>