1 files changed, 35 insertions, 0 deletions
diff --git a/gcd.d b/gcd.d
new file mode 100644
index 0000000..b9599e4
--- /dev/null
+++ b/gcd.d
@@ -0,0 +1,35 @@
+// D: https://dlang.org
+//
+// Synopsis:
+//
+// GNU D Compiler (tested GCC 12):
+// $ gdc gcd.d -o gcd-d
+// $ ./gcd-d 11 22 33 121
+//
+// LLVM D Compiler (tested LDC2 1.24.0):
+// $ ldc2 --run gcd 11 22 33 121
+// or
+// $ ldc2 --of=gcd-d gcd.d
+// $ ./gcd-d 11 22 33 121
+//
+
+import std.algorithm: map, reduce;
+import std.conv: to;
+import std.stdio: writeln;
+
+ulong gcd2(ulong a, ulong b) {
+  ulong c;
+  while (b > 0) {
+    c = b;
+    b = a % b;
+    a = c;
+  }
+  return c;
+}
+
+void main(string[] args) {
+  if (args.length > 1) {
+    auto gcd = args[1..$].map!(to!ulong).reduce!gcd2();
+    writeln(gcd);
+  }
+}