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  <meta charset="utf-8">
  <title>JS Number Pattern 45 - Try It (Parameterized)</title>
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  <h1>X Pattern (Parameterized Grid)</h1>
  <p>Edit <code>rows</code> and <code>cols</code>, then click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 4;
    const cols = 9;
    const mid = Math.floor((cols + 1) / 2);
    let result = "";

    for (let i = 1; i <= rows; i++) {
      let line = "";
      for (let j = 1; j <= cols; j++) {
        if (i === j || j === mid || i === cols + 1 - j) {
          line += "*";
        } else {
          line += "0";
        }
      }
      result += line + "\n";
    }

    document.getElementById("output").textContent = result;
  </script>
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JavaScript Number Pattern 45 (Try It — Parameterized)