calculator.php - main - kosalexs/test

calculator.php
185 строк6 KB
Konstantin Alekseev
feat: первая версия проекта
10 фев 2026, 08:48
10 фев 2026, 08:48163197e
<!DOCTYPE html>
<html lang="ru">
<head>
    <meta charset="UTF-8">
    <title>Простейший калькулятор</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #f4f4f4;
        }
        .calculator {
            border: 1px solid #ccc;
            padding: 20px;
            border-radius: 10px;
            background-color: #fff;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            width: 300px;
        }
        .display {
            width: 100%;
            height: 40px;
            margin-bottom: 10px;
            text-align: right;
            font-size: 1.5em;
            padding: 5px;
            box-sizing: border-box;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
        .buttons {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
        }
        button {
            padding: 10px;
            font-size: 1em;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            background-color: #f0f0f0;
        }
        button:hover {
            background-color: #e0e0e0;
        }
        .operator {
            background-color: #ffcccb;
        }
        .equals {
            background-color: #98fb98;
        }
        .round {
            background-color: #87ceeb;
        }
    </style>
</head>
<body>
    <div class="calculator">
        <input type="text" class="display" id="display" disabled>
        <div class="buttons">
            <button onclick="appendToDisplay('7')">7</button>
            <button onclick="appendToDisplay('8')">8</button>
            <button onclick="appendToDisplay('9')">9</button>
            <button onclick="setOperation('/')" class="operator">/</button>

            <button onclick="appendToDisplay('4')">4</button>
            <button onclick="appendToDisplay('5')">5</button>
            <button onclick="appendToDisplay('6')">6</button>
            <button onclick="setOperation('*')" class="operator">*</button>

            <button onclick="appendToDisplay('1')">1</button>
            <button onclick="appendToDisplay('2')">2</button>
            <button onclick="appendToDisplay('3')">3</button>
            <button onclick="setOperation('-')" class="operator">-</button>

            <button onclick="appendToDisplay('0')">0</button>
            <button onclick="appendToDisplay('.')">.</button>
            <button onclick="calculateResult()" class="equals">=</button>
            <button onclick="setOperation('+')" class="operator">+</button>

            <button onclick="roundToInteger()" class="round">Целое</button>
            <button onclick="roundToTwoDecimals()" class="round">2 знака</button>
            <button onclick="clearDisplay()">C</button>
            <button onclick="deleteLastChar()">←</button>
        </div>
    </div>

    <script>
        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;
        }
    </script>
</body>
</html>