html/lab5/task5/script.js - main - aska/web-static-labs

html/lab5/task5/script.js
89 строк3 KB
unknown
лабы 1 4 5
14 ноя 2025, 09:16
14 ноя 2025, 09:16b757c12
'use strict';

document.addEventListener('DOMContentLoaded', () => {
    const display = document.getElementById('display');
    const buttons = document.querySelectorAll('#buttons button');
    const equals = document.getElementById('equals');
    const clear = document.getElementById('clear');

    let currentInput = '';
    let operator = null;
    let firstOperand = null;

    const updateDisplay = () => {
        display.value = currentInput;
    };

    buttons.forEach(button => {
        button.addEventListener('click', () => {
            const value = button.dataset.value;

            if (value === undefined && button.id !== 'equals' && button.id !== 'clear') {
                return; // Игнорируем кнопки без значения, кроме equals и clear
            }

            if (!isNaN(value) || value === '.') {
                currentInput += value;
                updateDisplay();
            } else if (['+', '-', '*', '/'].includes(value)) {
                if (firstOperand === null) {
                    firstOperand = parseFloat(currentInput);
                    operator = value;
                    currentInput = '';
                    updateDisplay();
                } else {
                    const result = calculate(firstOperand, parseFloat(currentInput), operator);
                    firstOperand = result;
                    operator = value;
                    currentInput = '';
                    updateDisplay();
                }
            } else if (button.id === 'equals') {
                if (firstOperand !== null && operator !== null && currentInput !== '') {
                    const result = calculate(firstOperand, parseFloat(currentInput), operator);
                    currentInput = String(result);
                    updateDisplay();
                    firstOperand = null;
                    operator = null;
                }
            } else if (button.id === 'clear') {
                currentInput = '';
                operator = null;
                firstOperand = null;
                updateDisplay();
            } else if (value === 'sqrt') {
                if (currentInput !== '') {
                    const num = parseFloat(currentInput);
                    if (num >= 0) {
                        currentInput = String(Math.sqrt(num));
                        updateDisplay();
                    } else {
                        currentInput = 'Error';
                        updateDisplay();
                    }
                }
            } else if (value === 'log') {
                if (currentInput !== '') {
                    const num = parseFloat(currentInput);
                    if (num > 0) {
                        currentInput = String(Math.log10(num));
                        updateDisplay();
                    } else {
                        currentInput = 'Error';
                        updateDisplay();
                    }
                }
            }
        });
    });

    const calculate = (a, b, op) => {
        switch (op) {
            case '+': return a + b;
            case '-': return a - b;
            case '*': return a * b;
            case '/': return b === 0 ? 'Error' : a / b;
            default: return NaN;
        }
    };
});