From ed81135660700743dc43cc8c649f368639eb41ef Mon Sep 17 00:00:00 2001
From: Anthony Wang <ta180m@gmail.com>
Date: Thu, 29 Apr 2021 20:40:27 +0000
Subject: [PATCH] A very scary for loop

---
 fast-pow/pow.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 fast-pow/pow.cpp

diff --git a/fast-pow/pow.cpp b/fast-pow/pow.cpp
new file mode 100644
index 0000000..76c6702
--- /dev/null
+++ b/fast-pow/pow.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+#include <numbers>
+
+auto pw(auto b,int e){auto r=b;for(--e<<=1;e>>=1;r*=(e&1)*b,b*=b);return r;}
+
+int main() {
+    std::cout << pw(2, 4) << std::endl;
+    std::cout << pw(std::numbers::e, 2) << std::endl;
+}