60. Modern Calculator/index.html

<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Calculator</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <form class="calculator" name="calc">
      <input type="text" class="value" name="txt" readonly="" />
      <span class="num clear" onclick="document.calc.txt.value = ''">c</span>
      <span class="num" onclick="document.calc.txt.value += '/'">/</span>
      <span class="num" onclick="document.calc.txt.value += '*'">*</span>
      <span class="num" onclick="document.calc.txt.value += '7'">7</span>
      <span class="num" onclick="document.calc.txt.value += '8'">8</span>
      <span class="num" onclick="document.calc.txt.value += '9'">9</span>
      <span class="num" onclick="document.calc.txt.value += '-'">-</span>
      <span class="num" onclick="document.calc.txt.value += '4'">4</span>
      <span class="num" onclick="document.calc.txt.value += '5'">5</span>
      <span class="num" onclick="document.calc.txt.value += '6'">6</span>
      <span class="num plus" onclick="document.calc.txt.value += '+'">+</span>
      <span class="num" onclick="document.calc.txt.value += '1'">1</span>
      <span class="num" onclick="document.calc.txt.value += '2'">2</span>
      <span class="num" onclick="document.calc.txt.value += '3'">3</span>
      <span class="num" onclick="document.calc.txt.value += '0'">0</span>
      <span class="num" onclick="document.calc.txt.value += '00'">00</span>
      <span class="num" onclick="document.calc.txt.value += '.'">.</span>
      <span
        class="num equal"
        onclick="document.calc.txt.value = eval(calc.txt.value)"
      >
        =
      </span>
    </form>
  </body>
</html>