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Exercise 16: Simple Calculator with if/else

Build a basic calculator using if/else conditional structures. Ideal for practicing operations and programming logic.

The primary objective is to practice using if/else statements.if/elseto perform basic mathematical operations according to the user's choice.

Activity​

  1. Ask the user to enter two numbers and an operation (+,-,*,/).

  2. Useif/elseTo perform the correct operation:

Add if you choose+Subtract if you choose-Multiplication if you choose*Division if you choose/

  1. Display the result in the console.

Solution​

Step 1: Create the index.html file​

HTML
<!DOCTYPE html>
<html lang="es">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Calculadora Sencilla con if/else</title>
  </head>
  <body>
    <h1>Ejercicio 16: Calculadora Sencilla con if/else</h1>
    <p>Los cambios se muestran en consola.</p>
    <script src="script.js"></script>
  </body>
</html>

Step 2: Write the code in script.js​

JavaScript
let numero1 = parseFloat(prompt("Ingresa el primer número:"));
let numero2 = parseFloat(prompt("Ingresa el segundo número:"));
let operacion = prompt("Ingresa la operación (+, -, *, /):");

if (operacion === "+") {
  console.log("Resultado:", numero1 + numero2);
} else if (operacion === "-") {
  console.log("Resultado:", numero1 - numero2);
} else if (operacion === "*") {
  console.log("Resultado:", numero1 * numero2);
} else if (operacion === "/") {
  console.log("Resultado:", numero1 / numero2);
} else {
  console.log("Operación no válida.");
}
info

🔎Check the sectionControl instructions in JavaScriptwhere you will find more information on this topic.