From c53e9fe25866376d1b3086579c01725444a04702 Mon Sep 17 00:00:00 2001
From: Fabian <@>
Date: Tue, 26 Jul 2022 21:27:23 +0200
Subject: 0f1, Code ueberarbeitet

---
 buch/papers/0f1/listings/potenzreihe.c | 56 ++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

(limited to 'buch/papers/0f1/listings/potenzreihe.c')

diff --git a/buch/papers/0f1/listings/potenzreihe.c b/buch/papers/0f1/listings/potenzreihe.c
index bfaa0e3..3eb9b86 100644
--- a/buch/papers/0f1/listings/potenzreihe.c
+++ b/buch/papers/0f1/listings/potenzreihe.c
@@ -1,5 +1,61 @@
 #include <math.h>
 
+/**
+  * @brief Calculates pochhammer
+  * @param (a+n-1)!
+  * @return Result
+  */
+static double pochhammer(const double x, double n)
+{
+    double temp = x;
+
+    if (n > 0)
+    {
+        while (n > 1)
+        {
+            temp *= (x + n - 1);
+            --n;
+        }
+
+        return temp;
+    }
+    else
+    {
+        return 1;
+    }
+}
+
+/**
+  * @brief Calculates the Factorial
+  * @param n!
+  * @return Result
+  */
+static double fac(int n)
+{
+    double temp = n;
+
+    if (n > 0)
+    {
+        while (n > 1)
+        {
+            --n;
+            temp *= n;
+        }
+        return temp;
+    }
+    else
+    {
+        return 1;
+    }
+}
+
+/**
+  * @brief Calculates the Hypergeometric Function 0F1(;b;z)
+  * @param b0 in 0F1(;b0;z)
+  * @param z in 0F1(;b0;z)
+  * @param n number of itertions (precision)
+  * @return Result
+  */
 static double powerseries(const double b, const double z, unsigned int n)
 {
     double temp = 0.0;
-- 
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