HTML_CSS_JS/calculator.html at main · SM991-web/HTML_CSS_JS · GitHub

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<!-- Calculator using  HTML CSS -->

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Calculator</title>
    <style>
        .calculator {
            width: 200px;
            margin: 100px auto;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
            }
        button {
            padding: 20px;
            font-size: 18px;
            cursor: pointer;
            }
        input {
            grid-column: span 4;
            padding: 10px;
            font-size: 20px;
            text-align: right;
            }

    </style>
</head>
<body>
    <h2>Simple Calculator</h2>
    <form name="calc">
        <input type="text" name="display" disabled><br><br>
        <button type="button" onclick="calc.display.value += '1'">1</button>
        <button type="button" onclick="calc.display.value += '2'">2</button>
        <button type="button" onclick="calc.display.value += '3'">3</button>
        <button type="button" onclick="calc.display.value += '4'">4</button><br>

        <button type="button" onclick="calc.display.value += '5'">5</button>
        <button type="button" onclick="calc.display.value += '6'">6</button>
        <button type="button" onclick="calc.display.value += '7'">7</button>
        <button type="button" onclick="calc.display.value += '8'">8</button><br>

        <button type="button" onclick="calc.display.value += '9'">9</button>
        <button type="button" onclick="calc.display.value += '0'">0</button>
        <button type="button" onclick="calc.display.value += '+'">+</button>
        <button type="button" onclick="calc.display.value += '-'">-</button><br>

    </form>
</body>
</html>

<!-- Calculator using  HTML CSS JS-->

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Calculator</title>
</head>
<body>
    <h2>Simple Calculator</h2>
    <form name="calc">
        <input type="text" name="display" disabled><br><br>
        <button type="button" onclick="calc.display.value += '1'">1</button>
        <button type="button" onclick="calc.display.value += '2'">2</button>
        <button type="button" onclick="calc.display.value += '3'">3</button>
        <button type="button" onclick="calc.display.value += '4'">4</button><br>

        <button type="button" onclick="calc.display.value += '5'">5</button>
        <button type="button" onclick="calc.display.value += '6'">6</button>
        <button type="button" onclick="calc.display.value += '7'">7</button>
        <button type="button" onclick="calc.display.value += '8'">8</button><br>

        <button type="button" onclick="calc.display.value += '9'">9</button>
        <button type="button" onclick="calc.display.value += '0'">0</button>
        <button type="button" onclick="calc.display.value += '+'">+</button>
        <button type="button" onclick="calc.display.value += '-'">-</button><br>

        <button type="button" onclick="calc.display.value += ''"></button>
        <button type="button" onclick="calc.display.value += '/'">/</button>
        <button type="button" onclick="calc.display.value = ''">C</button>
        <button type="button" onclick="calc.display.value = eval(calc.display.value)">=</button>
    </form>
    <script>
        let display = document.getElementById("display");
        let currentInput = "";

        function appendNumber(number) {
        currentInput += number;
        display.value = currentInput;
        }

        function appendOperator(operator) {
        currentInput += " " + operator + " ";
        display.value = currentInput;
        }

        function clearDisplay() {
        currentInput = "";
        display.value = currentInput;
        }

        function calculate() {
        try {
            currentInput = eval(currentInput).toString();
            display.value = currentInput;
        } catch (error) {
            display.value = "Error";
        }
        }
    </script>
</body>
</html>