From 096dd0ce03a705e400f9dfbd3d121dd45e08d84a Mon Sep 17 00:00:00 2001
From: "George G. Vega Yon" <g.vegayon@gmail.com>
Date: Thu, 19 Sep 2024 12:41:40 -0600
Subject: [PATCH] lab5, q2 done

---
 lab5/binom.cpp | 10 +++++++++-
 lab5/binom.hpp | 18 +++++++++++++++++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/lab5/binom.cpp b/lab5/binom.cpp
index 73d9f51..7aa4ce4 100644
--- a/lab5/binom.cpp
+++ b/lab5/binom.cpp
@@ -1,11 +1,19 @@
 #include "binom.hpp"
 
+
 int main() {
 
   Binom b(10, 0.5);
 
+  std::cout << "Q1: Factorials" << std::endl;
   for (int i = 0; i < 10; i++) {
-    std::cout << b.factorial(i) << std::endl;
+    std::cout << b.factorial(i + 1) << std::endl;
+  }
+
+  std::cout << "Q2 choose" << std::endl;
+  for (int i = 0; i < 10; i++) {
+    std::cout << b.choose(10, i + 1) << std::endl;
+
   }
 
   return 0;
diff --git a/lab5/binom.hpp b/lab5/binom.hpp
index cf8970a..af682e4 100644
--- a/lab5/binom.hpp
+++ b/lab5/binom.hpp
@@ -19,7 +19,23 @@ class Binom {
 
 
 inline int Binom::factorial(int n) const {
-  return n;
+
+  if (n <= 1)
+    return 1;
+
+  return this->factorial(n - 1) * n;
+
+}
+
+inline double Binom::choose(int a, int b) const {
+
+  // double a_dbl = (double) a;
+  // double b_dbl = static_cast<double>(b);
+
+  return this->factorial(a)/(
+      factorial(a - b) * factorial(b)
+  );
+
 }
 
 #endif