From d8e8de918d537e3bf762246c4eb9d32cf00d3c66 Mon Sep 17 00:00:00 2001
From: Ulriche Nguefack <ulriche.nguefack@informatik.hs-fulda.de>
Date: Wed, 7 Feb 2024 14:44:24 +0100
Subject: [PATCH] refactoring: ending-permutation|combination

---
 src/main/c/Calculator/calculator.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/main/c/Calculator/calculator.c b/src/main/c/Calculator/calculator.c
index 8d4cdc8..5110e69 100644
--- a/src/main/c/Calculator/calculator.c
+++ b/src/main/c/Calculator/calculator.c
@@ -128,6 +128,17 @@ double factorial(double num) {
         return num * factorial(num - 1);
     }
 }
+double permutation(int n, int r) {
+    double result = 1;
+    for (int i = 0; i < r; i++) {
+        result *= (n - i);
+    }
+    return result;
+}
+
+double combination(int n, int r) {
+    return permutation(n, r) / factorial(r);
+}
 
 int getIntInput(const char *message) {
     int input;