script.js - main - kosalexs/test

script.js
97 строк2 KB
Konstantin Alekseev
Add square function to calculator
10 фев 2026, 15:09
10 фев 2026, 15:09f1e262c
let currentInput = '';
let operator = null;
let previousInput = '';
let resetScreen = false;

function appendToDisplay(value) {
    const display = document.getElementById('display');
    if (resetScreen) {
        display.value = '';
        resetScreen = false;
    }
    display.value += value;
    currentInput = display.value;
}

function setOperation(op) {
    if (currentInput === '') return;
    if (previousInput !== '') {
        calculateResult();
    }
    operator = op;
    previousInput = currentInput;
    currentInput = '';
    resetScreen = true;
}

function calculateResult() {
    if (operator === null || currentInput === '') return;
    const display = document.getElementById('display');
    const prev = parseFloat(previousInput);
    const current = parseFloat(currentInput);
    let result = 0;

    switch (operator) {
        case '+':
            result = prev + current;
            break;
        case '-':
            result = prev - current;
            break;
        case '*':
            result = prev * current;
            break;
        case '/':
            if (current === 0) {
                alert('Деление на ноль!');
                clearDisplay();
                return;
            }
            result = prev / current;
            break;
    }

    display.value = result;
    currentInput = result;
    operator = null;
    previousInput = '';
    resetScreen = true;
}

function roundToInteger() {
    const display = document.getElementById('display');
    if (display.value === '') return;
    const value = parseFloat(display.value);
    display.value = Math.round(value);
    currentInput = display.value;
}

function roundToTwoDecimals() {
    const display = document.getElementById('display');
    if (display.value === '') return;
    const value = parseFloat(display.value);
    display.value = Math.round(value * 100) / 100;
    currentInput = display.value;
}

function clearDisplay() {
    document.getElementById('display').value = '';
    currentInput = '';
    previousInput = '';
    operator = null;
    resetScreen = false;
}

function deleteLastChar() {
    const display = document.getElementById('display');
    display.value = display.value.slice(0, -1);
    currentInput = display.value;
}

function squareNumber() {
    const display = document.getElementById('display');
    if (display.value === '') return;
    const value = parseFloat(display.value);
    display.value = value * value;
    currentInput = display.value;
}