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Program 6

<!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>
      body {
        font-family: Arial, sans-serif;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
        margin: 0;
        background-color: #f0f0f0;
      }
      .calculator {
        background-color: #fff;
        border-radius: 8px;
        box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        padding: 20px;
        width: 300px;
      }
      #display {
        width: 100%;
        height: 40px;
        font-size: 1.5em;
        text-align: right;
        margin-bottom: 10px;
        padding: 5px;
        box-sizing: border-box;
      }
      .buttons {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
      }
      button {
        padding: 10px;
        font-size: 1.2em;
        border: none;
        background-color: #e0e0e0;
        cursor: pointer;
        border-radius: 4px;
      }
      button:hover {
        background-color: #d0d0d0;
      }
      .operator {
        background-color: #f0a030;
        color: white;
      }
      .operator:hover {
        background-color: #e09020;
      }
    </style>
  </head>
  <body>
    <div class="calculator">
      <input type="text" id="display" readonly />
      <div class="buttons">

        <button onclick="appendToDisplay('7')">7</button>
        <button onclick="appendToDisplay('8')">8</button>
        <button onclick="appendToDisplay('9')">9</button>

        <button class="operator" onclick="setOperation('+')">+</button>

        <button onclick="appendToDisplay('4')">4</button>
        <button onclick="appendToDisplay('5')">5</button>
        <button onclick="appendToDisplay('6')">6</button>

        <button class="operator" onclick="setOperation('-')">−</button>

        <button onclick="appendToDisplay('1')">1</button>
        <button onclick="appendToDisplay('2')">2</button>
        <button onclick="appendToDisplay('3')">3</button>

        <button class="operator" onclick="setOperation('*')">×</button>

        <button onclick="appendToDisplay('0')">0</button>
        <button onclick="appendToDisplay('.')">.</button>

        <button class="operator" onclick="calculate()">=</button>

        <button class="operator" onclick="setOperation('/')">÷</button>
        <button class="operator" onclick="setOperation('%')">%</button>

        <button class="operator" onclick="setOperation('^')">x<sup>y</sup></button>

        <button class="operator" onclick="squareRoot()">√</button>
        <button class="operator" onclick="square()">x<sup>2</sup></button>
        <button onclick="clearDisplay()">C</button>
        
      </div>
    </div>
    <script>
      let display = document.getElementById("display");
      let currentValue = "";
      let operation = "";
      let previousValue = "";
      function appendToDisplay(value) {
        currentValue += value;
        display.value = currentValue;
      }
      function clearDisplay() {
        currentValue = "";
        operation = "";
        previousValue = "";
        display.value = "";
      }
      function setOperation(op) {
        if (currentValue !== "") {
          if (previousValue !== "") {
            calculate();
          }
          operation = op;
          previousValue = currentValue;
          currentValue = "";
        }
      }
      function calculate() {
        if (previousValue !== "" && currentValue !== "") {
          let result;
          const prev = parseFloat(previousValue);
          const current = parseFloat(currentValue);
          switch (operation) {
            case "+":
              result = prev + current;
              break;
            case "-":
              result = prev - current;
              break;
            case "*":
              result = prev * current;
              break;
            case "/":
              result = prev / current;
              break;
            case "%":
              result = prev % current;
              break;
            case "^":
              result = Math.pow(prev, current);
              break;
          }
          display.value = result;
          previousValue = result.toString();
          currentValue = "";
          operation = "";
        }
      }
      function squareRoot() {
        if (currentValue !== "") {
          const result = Math.sqrt(parseFloat(currentValue));
          display.value = result;
          currentValue = result.toString();
        }
      }
      function square() {
        if (currentValue !== "") {
          const result = Math.pow(parseFloat(currentValue), 2);
          display.value = result;
          currentValue = result.toString();
        }
      }
    </script>
  </body>
</html>