Modern Calculator Project

Project Overview

This project is a Modern Calculator built using HTML, CSS, and JavaScript. It features a sleek and responsive design with a digital display, support for basic arithmetic operations, and animations for a modern user experience. The calculator is designed to work seamlessly on both desktop and mobile devices.

Requirements

  • Programming Language: HTML, CSS, JavaScript
  • Frameworks/Libraries: None
  • Tools: VS Code, Git
  • APIs: None
  • Other Dependencies: Google Fonts (Digital-7)

Process/Steps

  1. Step 1: Create Project Files
    • Create a folder named calculator-project.
    • Inside the folder, create three files:
      • index.html - For the HTML structure.
      • styles.css - For styling the calculator.
      • script.js - For handling calculator logic.
  2. Step 2: Write HTML Code
    • In index.html, create the basic structure of the calculator using HTML.
    • Add buttons for digits (0-9), operators (+, -, *, /), and special functions (AC, ⌫, =).
  3. Step 3: Style the Calculator
    • In styles.css, style the calculator to make it visually appealing.
    • Use gradients, shadows, and animations for a modern look.
  4. Step 4: Add JavaScript Logic
    • In script.js, write functions to handle button clicks, perform calculations, and update the display.
  5. Step 5: Test and Deploy
    • Test the calculator on different devices to ensure responsiveness.
    • Deploy the project using GitHub Pages or any hosting service.

Code Explanation

HTML Code


<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Modern Calculator</title>
  <link rel="stylesheet" href="styles.css">
  <link href="https://fonts.googleapis.com/css2?family=Digital-7&display=swap" rel="stylesheet">
</head>
<body>
  <div class="calculator">
    <div class="display">
      <input type="text" id="display" value="0" readonly>
    </div>
    <div class="buttons">
      <button class="button" onclick="clearDisplay()">AC</button>
      <button class="button" onclick="backspace()">⌫</button>
      <button class="button" onclick="appendToDisplay('/')">Γ·</button>
      <button class="button" onclick="appendToDisplay('*')">Γ—</button>
      <button class="button" onclick="appendToDisplay('7')">7</button>
      <button class="button" onclick="appendToDisplay('8')">8</button>
      <button class="button" onclick="appendToDisplay('9')">9</button>
      <button class="button" onclick="appendToDisplay('-')">-</button>
      <button class="button" onclick="appendToDisplay('4')">4</button>
      <button class="button" onclick="appendToDisplay('5')">5</button>
      <button class="button" onclick="appendToDisplay('6')">6</button>
      <button class="button" onclick="appendToDisplay('+')">+</button>
      <button class="button" onclick="appendToDisplay('1')">1</button>
      <button class="button" onclick="appendToDisplay('2')">2</button>
      <button class="button" onclick="appendToDisplay('3')">3</button>
      <button class="button" onclick="appendToDisplay('.')">.</button>
      <button class="button equals" onclick="calculateResult()">=</button>
      <button class="button zero" onclick="appendToDisplay('0')">0</button>
    </div>
  </div>
  <script src="script.js"></script>
</body>
</html>

CSS Code


* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #2c3e50, #8e44ad);
  background-size: cover;
  color: white;
  user-select: none;
  overflow: hidden;
}

.calculator {
  background: rgba(13, 71, 161, 0.8);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  width: 90%;
  max-width: 320px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin: 20px;
}

.display {
  background: linear-gradient(145deg, #1e1e1e, #2a2a2a);
  color: #00ff00;
  font-size: 36px;
  font-family: 'Digital-7', monospace;
  padding: 20px;
  text-align: right;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  margin: 20px;
  box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.5), inset 0 -4px 8px rgba(255, 255, 255, 0.1);
  overflow: hidden;
  white-space: nowrap;
  position: relative;
}

.display input {
  background: transparent;
  border: none;
  color: #00ff00;
  font-size: 36px;
  font-family: 'Digital-7', monospace;
  width: 100%;
  text-align: right;
  outline: none;
  caret-color: #00ff00;
  animation: slideIn 0.3s ease-in-out;
}

@keyframes slideIn {
  0% {
      transform: translateX(10px);
      opacity: 0.5;
  }
  100% {
      transform: translateX(0);
      opacity: 1;
  }
}

.animate {
  display: inline-block;
  animation: slideIn 0.3s ease-in-out;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 10px;
  padding: 20px;
}

.button {
  background: linear-gradient(145deg, #4a4a4a, #3a3a3a);
  color: #fff;
  font-size: 24px;
  font-family: 'Arial', sans-serif;
  border: none;
  border-radius: 10px;
  padding: 15px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3), inset 0 -2px 4px rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
}

.button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
  border-radius: 10px;
  z-index: 1;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4), inset 0 -2px 4px rgba(255, 255, 255, 0.1);
}

.button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.button:focus {
  outline: none;
}

.button[onclick="calculateResult()"] {
  background: linear-gradient(145deg, #ff6f61, #ff3b3f);
  grid-column: span 2;
}

.button[onclick="calculateResult()"]:hover {
  background: linear-gradient(145deg, #ff3b3f, #ff6f61);
}

.button[onclick="clearDisplay()"],
.button[onclick="backspace()"] {
  background: linear-gradient(145deg, #6c5ce7, #a29bfe);
}

.button[onclick="clearDisplay()"]:hover,
.button[onclick="backspace()"]:hover {
  background: linear-gradient(145deg, #a29bfe, #6c5ce7);
}

.button.zero {
  grid-column: span 2;
  background: linear-gradient(145deg, #5ce763, #82c714);
}

.button:nth-child(3),
.button:nth-child(4),
.button:nth-child(8),
.button:nth-child(12),
.button:nth-child(16) {
  background: linear-gradient(45deg, yellow, orange);
  color: black;
  font-weight: bold;
  border: none;
  box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}

.button:nth-child(3):hover,
.button:nth-child(4):hover,
.button:nth-child(8):hover,
.button:nth-child(12):hover,
.button:nth-child(16):hover {
  background: linear-gradient(45deg, orange, yellow);
  transform: scale(1.1);
}

@media (max-width: 480px) {
  .calculator {
    width: 100%;
    border-radius: 0;
    margin: 0;
  }

  .display {
    font-size: 28px;
    padding: 15px;
    margin: 10px;
  }

  .buttons {
    grid-gap: 5px;
    padding: 10px;
  }

  .button {
    font-size: 20px;
    padding: 10px;
  }
}

JavaScript Code


function appendToDisplay(value) {
  const display = document.getElementById("display");
  if (display.value === "0" && value !== ".") {
    display.value = value;
  } else {
    display.value += value;
  }
}

function clearDisplay() {
  document.getElementById("display").value = "0";
}

function backspace() {
  const display = document.getElementById("display");
  display.value = display.value.slice(0, -1) || "0";
}

function calculateResult() {
  const display = document.getElementById("display");
  try {
    display.value = eval(display.value);
  } catch (e) {
    display.value = "Error";
  }
}

Screenshots/Output

Calculator Screenshot