Update math/iterative_factorial.cpp

Renjian-buchai · realstealthninja · web-flow · commit c8eec4a8ce6c · 2023-04-29T22:48:16.000+08:00
Co-authored-by: realstealthninja &lt;68815218+realstealthninja@users.noreply.github.com&gt;
diff --git a/math/iterative_factorial.cpp b/math/iterative_factorial.cpp
@@ -7,8 +7,10 @@
  * @description Calculates factorial iteratively.
  * https://en.wikipedia.org/wiki/Factorial
  *
- * Factorial formula:
- * n! = n * (n - 1) * (n - 2) * ... * 2 * 1
+ * \f[n! = n\times(n-1)\times(n-2)\times(n-3)\times\ldots\times3\times2\times1
+ *       = n\times(n-1)!\f]
+ * for example:
+ * \f$4! = 4\times3! = 4\times3\times2\times1 = 24\f$
  *
  * @example
  *

Original file line number	Diff line number	Diff line change
`@@ -7,8 +7,10 @@`
`7`	`7`	`* @description Calculates factorial iteratively.`
`8`	`8`	`* https://en.wikipedia.org/wiki/Factorial`
`9`	`9`	`*`
`10`		`- * Factorial formula:`
`11`		`- * n! = n * (n - 1) * (n - 2) * ... * 2 * 1`
	`10`	`+ * \f[n! = n\times(n-1)\times(n-2)\times(n-3)\times\ldots\times3\times2\times1`
	`11`	`+ * = n\times(n-1)!\f]`
	`12`	`+ * for example:`
	`13`	`+ * \f$4! = 4\times3! = 4\times3\times2\times1 = 24\f$`
`12`	`14`	`*`
`13`	`15`	`* @example`
`14`	`16`	`*`