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Cesar Giulano Gonzalez Maqueda committed
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<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        table, td{
            border: 1px solid black;
        }
        td{
            width: 100px;
            height: 25px;
            text-align: center;
            font-family: "Lucida Console", "Courier New", monospace;
        }
        #screen{
            width: 250px;
            text-align: right;
        }
        #divisor{
            width: 100px;
        }
        body {
            background: #555;
        }

        .content {
            max-width: 500px;
            margin: auto;
            background: white;
            padding: 10px;
        }
    </style>

    <meta charset="UTF-8">
    <title>Calculadora</title>
</head>
<body>
    <div class="content">
        <table>
            <tr>
                <td id="screen"></td>
                <td id="divisor">/</td>
                <td id="cc">CE</td>
            </tr>
        </table>
        <table>
            <tr>
                <td id="siete">7</td>
                <td id="ocho">8</td>
                <td id="nueve">9</td>
                <td id="mas">+</td>
            </tr>
            <tr>
                <td id="cuatro">4</td>
                <td id="cinco">5</td>
                <td id="seis">6</td>
                <td id="menos">-</td>
            </tr>
            <tr>
                <td id="uno">1</td>
                <td id="dos">2</td>
                <td id="tres">3</td>
                <td id="mult">*</td>
            </tr>
            <tr>
                <td id="dcero">00</td>
                <td id="cero">0</td>
                <td id="punto">.</td>
                <td id="result">=</td>
            </tr>
        </table>
    </div>
</body>
<script>
    (function calculadora() {
        //Cargamos todos las teclas de la calculadora y tambien el screen
        const screen = document.querySelector('#screen');
        const divisor = document.querySelector('#divisor');
        const suma = document.querySelector('#mas');
        const resta = document.querySelector('#menos');
        const multiplicacion = document.querySelector('#mult');
        const uno = document.querySelector('#uno');
        const dos = document.querySelector('#dos');
        const tres = document.querySelector('#tres');
        const cuatro = document.querySelector('#cuatro');
        const cinco = document.querySelector('#cinco');
        const seis = document.querySelector('#seis');
        const siete = document.querySelector('#siete');
        const ocho = document.querySelector('#ocho');
        const nueve = document.querySelector('#nueve');
        const cero = document.querySelector('#cero');
        const doble_cero = document.querySelector('#dcero');
        const punto = document.querySelector('#punto');
        const igual = document.querySelector('#result');
        const ce = document.querySelector('#cc');

        //Esta variable nos servira para guardar numero, operador, numero, respectivamente.
        let params = ["", "", ""];

        let current_param = 0;

        //EventListener que escucha por teclas presionadas para ejecutar en la calculadora
        document.addEventListener("keypress", function onPress(event) {
            switch (event.key){
                case "1":
                    params[current_param] += "1";
                    writeScreen(params)
                    break;
                case "2":
                    params[current_param] += "2";
                    writeScreen(params)
                    break;
                case "3":
                    params[current_param] += "3";
                    writeScreen(params)
                    break;
                case "4":
                    params[current_param] += "4";
                    writeScreen(params)
                    break;
                case "5":
                    params[current_param] += "5";
                    writeScreen(params)
                    break;
                case "6":
                    params[current_param] += "6";
                    writeScreen(params)
                    break;
                case "7":
                    params[current_param] += "7";
                    writeScreen(params)
                    break;
                case "8":
                    params[current_param] += "8";
                    writeScreen(params)
                    break;
                case "9":
                    params[current_param] += "9";
                    writeScreen(params)
                    break;
                case "0":
                    if(!(screen.innerHTML.length === 1 && screen.innerHTML.includes("0"))){
                        params[current_param] += "0";
                        writeScreen(params);
                    }
                    break;
                case "+":
                    escribeOperador("+");
                    break;
                case "-":
                    escribeOperador("-");
                    break;
                case "*":
                    escribeOperador("*");
                    break;
                case "/":
                    escribeOperador("/");
                    break;
                case "=":
                    if(current_param===2){
                        darResultado();
                    }
                    break;
                case "Enter":
                    if(current_param===2){
                        darResultado();
                    }
                    break;
                default:
                    console.log(event.key);
            }
        });

        //Limpiar pantalla, y dejar en estado iniciado la calculadora
        ce.addEventListener("click", ()=>{
            params = ["", "", ""];
            current_param = 0;
            writeScreen(params);
        })

        uno.addEventListener("click", ()=>{
            params[current_param] += "1";
            writeScreen(params);
        })
        dos.addEventListener("click", ()=>{
            params[current_param] += "2";
            writeScreen(params);
        })
        tres.addEventListener("click", ()=>{
            params[current_param] += "3";
            writeScreen(params);
        })
        cuatro.addEventListener("click", ()=>{
            params[current_param] += "4";
            writeScreen(params);
        })
        cinco.addEventListener("click", ()=>{
            params[current_param] += "5";
            writeScreen(params);
        })
        seis.addEventListener("click", ()=>{
            params[current_param] += "6";
            writeScreen(params);
        })
        siete.addEventListener("click", ()=>{
            params[current_param] += "7";
            writeScreen(params);
        })
        ocho.addEventListener("click", ()=>{
            params[current_param] += "8";
            writeScreen(params);
        })
        nueve.addEventListener("click", ()=>{
            params[current_param] += "9";
            writeScreen(params);
        })
        doble_cero.addEventListener("click", ()=>{
            if(screen.innerHTML.length !== 0
                && !(screen.innerHTML.length === 1 && screen.innerHTML.includes("0"))){
                params[current_param] += "00";
                writeScreen(params);
            }
        })
        cero.addEventListener("click", ()=>{
            if(!(screen.innerHTML.length === 1 && screen.innerHTML.includes("0"))){
                params[current_param] += "0";
                writeScreen(params);
            }
        })
        punto.addEventListener("click", ()=>{
            if(!screen.innerHTML.includes(".")){
                params[current_param] += ".";
                writeScreen(params);
            }
        })
        suma.addEventListener("click", ()=>{
            escribeOperador("+")
        });
        resta.addEventListener("click", ()=>{
            escribeOperador("-")
        });
        multiplicacion.addEventListener("click", ()=>{
            escribeOperador("*")
        });
        divisor.addEventListener("click", ()=>{
            escribeOperador("/")
        });

        igual.addEventListener("click", ()=>{
            if(current_param===2){
                darResultado();
            }
        })

        //Funcion que administra el funcionamiento de presionar =
        let darResultado = ()=> {
            let param1 = Number(params[0]);
            let param2 = Number(params[2]);
            let resultado;
            switch (params[1]) {
                case "+":
                    resultado = (param1 + param2).toFixed(2);
                    break;
                case "-":
                    resultado = (param1 - param2).toFixed(2);
                    break;
                case "*":
                    resultado = (param1 * param2).toFixed(2);
                    break;
                case "/":
                    resultado = (param1 / param2).toFixed(2);
                    break;
                default:

            }
            params[0] = ""+resultado;
            current_param = 0;
            params[1] = "";
            params[2] = "";
            writeScreen(params);
        }

        //Funcion que administra el funcionamiento de presionar un operador.
        function escribeOperador(operador){
            if(screen.innerHTML.length !== 0){
                if(current_param === 0){
                    current_param = 2;
                    params[1] += operador;
                    writeScreen(params);
                }else if(current_param === 2){
                    let param1 = Number(params[0]);
                    let param2 = Number(params[2]);
                    let resultado;
                        switch (params[1]) {
                            case "+":
                                resultado = (param1 + param2).toPrecision(2);
                                break;
                            case "-":
                                resultado = (param1 - param2).toPrecision(2);
                                break;
                            case "*":
                                resultado = (param1 * param2).toPrecision(2);
                                break;
                            case "/":
                                resultado = (param1 / param2).toPrecision(2);
                                break;
                            default:

                        }
                        params[0] = ""+resultado;
                        current_param = 2;
                        params[1] = operador;
                        params[2] = "";
                        writeScreen(params);
                }
            }
        }

    })()
    function writeScreen(params){
        const screen = document.querySelector('#screen');
        screen.innerHTML = ""+params[0]+params[1]+params[2];
    }
</script>
</html>