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

html/lab5/task5/script.js
131 строка4 KB
Dasha_10
изменения
27 окт 2025, 07:57
27 окт 2025, 07:57f3e9b7b
document.addEventListener('DOMContentLoaded', () => {
    const display = document.getElementById('display');
    let current = '0';
    let prev = null;
    let operator = null;
    let resetDisplay = false;

    function updateDisplay() {
        display.textContent = current;
    }

    function inputDigit(digit) {
        if (resetDisplay || current === '0') {
            current = digit;
            resetDisplay = false;
        } else {
            current += digit;
        }
        updateDisplay();
    }

    function inputDot() {
        if (resetDisplay) {
            current = '0.';
            resetDisplay = false;
        } else if (!current.includes('.')) {
            current += '.';
        }
        updateDisplay();
    }

    function clearAll() {
        current = '0';
        prev = null;
        operator = null;
        resetDisplay = false;
        updateDisplay();
    }

    function handleOperator(nextOperator) {
        if (operator && !resetDisplay) {
            calculate();
        } else {
            prev = parseFloat(current);
        }
        operator = nextOperator;
        resetDisplay = true;
    }

    function sqrt() {
        let num = parseFloat(current);
        if (num < 0) {
            current = 'Ошибка';
        } else {
            current = String(Math.sqrt(num));
        }
        resetDisplay = true;
        updateDisplay();
    }

    function log() {
        let num = parseFloat(current);
        if (num <= 0) {
            current = 'Ошибка';
        } else {
            current = String(Math.log10(num));
        }
        resetDisplay = true;
        updateDisplay();
    }

    function pow() {
        prev = parseFloat(current);
        operator = 'pow';
        resetDisplay = true;
    }

    function calculate() {
        let result;
        const curr = parseFloat(current);
        if (operator === 'pow') {
            result = Math.pow(prev, curr);
        } else {
            switch (operator) {
                case '+': result = prev + curr; break;
                case '−': result = prev - curr; break;
                case '×': result = prev * curr; break;
                case '÷':
                    if (curr === 0) {
                        current = 'Ошибка';
                        updateDisplay();
                        operator = null;
                        prev = null;
                        resetDisplay = true;
                        return;
                    }
                    result = prev / curr;
                    break;
                default: return;
            }
        }
        current = String(result);
        operator = null;
        prev = null;
        resetDisplay = true;
        updateDisplay();
    }

    document.querySelector('.buttons').addEventListener('click', (e) => {
        if (!e.target.matches('button')) return;
        if (e.target.classList.contains('number')) {
            inputDigit(e.target.textContent);
        } else if (e.target.classList.contains('dot')) {
            inputDot();
        } else if (e.target.classList.contains('operator')) {
            handleOperator(e.target.textContent);
        } else if (e.target.classList.contains('equal')) {
            calculate();
        } else if (e.target.classList.contains('clear')) {
            clearAll();
        } else if (e.target.classList.contains('sqrt')) {
            sqrt();
        } else if (e.target.classList.contains('log')) {
            log();
        } else if (e.target.classList.contains('pow')) {
            pow();
        }
    });

    updateDisplay();
});