From 55a15dc14b6093abbb11cd2a37aae69898692513 Mon Sep 17 00:00:00 2001
From: WerWolv <werwolv98@gmail.com>
Date: Tue, 5 Oct 2021 21:57:05 +0200
Subject: [PATCH] includes/std: Added sign, copy_sign, factorial, comb and perm
 math functions

---
 includes/libstd/math.pat | 42 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/includes/libstd/math.pat b/includes/libstd/math.pat
index 51cd8e4..95626b7 100644
--- a/includes/libstd/math.pat
+++ b/includes/libstd/math.pat
@@ -17,4 +17,46 @@ namespace std::math {
 		else return x;
 	};
 
+	fn sign(auto x) {
+	if (x > 0)
+		return 1;
+	else if (x < 0)
+		return -1;
+	else
+		return 0;
+};
+
+	fn copy_sign(auto x, auto y) {
+		if (y >= 0)
+			return std::math::abs(x);
+		else
+			return -std::math::abs(x);
+	};
+
+	fn factorial(u128 x) {
+		u128 result;
+		
+		result = x;
+		while (x > 1) {
+			x = x - 1;
+			result = result * x;
+		}
+		
+		return result;
+	};
+
+	fn comb(u128 n, u128 k) {
+		if (k > n)
+			return 0;
+		else
+			return std::math::factorial(n) / (std::math::factorial(k) * std::math::factorial(n - k));
+	};
+
+	fn perm(u128 n, u128 k) {
+		if (k > n)
+			return 0;
+		else
+			return std::math::factorial(n) / std::math::factorial(n - k);
+	};
+
 }
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