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  <title>GCD — iterative</title>
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  <h1>Greatest common divisor</h1>
  <p>Edit <code>number1</code> and <code>number2</code>, then <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function findGcd(num1, num2) {
        num1 = Math.abs(num1);
        num2 = Math.abs(num2);
        while (num2 !== 0) {
          var temp = num2;
          num2 = num1 % num2;
          num1 = temp;
        }
        return num1;
      }
      var number1 = 48;
      var number2 = 18;
      var g = findGcd(number1, number2);
      document.getElementById("out").textContent =
        "GCD of " + number1 + " and " + number2 + " is: " + g;
    })();
  </script>
</body>
</html>

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JavaScript GCD — Iterative Euclidean (Try It)