From 354ed22c9a3569832e50d6d294dd514c7615e8a8 Mon Sep 17 00:00:00 2001
From: Dan Ballard <dan@mindstab.net>
Date: Mon, 29 Jun 2026 12:03:37 -0700
Subject: [PATCH] kotlin prime finder; gitignore

---
 .gitignore  |  3 +++
 Makefile    |  6 +++++-
 autoTest.pl |  9 ++++++++-
 primes.kt   | 19 +++++++++++++++++++
 4 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 primes.kt

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..46394f7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.iml
+.idea
+*.swp
diff --git a/Makefile b/Makefile
index 3240ee8..9bdea9f 100644
--- a/Makefile
+++ b/Makefile
@@ -3,4 +3,8 @@ default:
 	./autoTest.pl
 
 clean: 
-	rm -f *.txt primesgcc primesclang primescpp primesaltc primes.class primespas primes*.exe primes.o primesobjc primes.ali primesada primesfor primese primes.h primes1.c primes1.o primes.id primes.make primescbl link.res ppas.sh primes.beam primesocaml primesasm primes.cmi primes.cmx luac.out primeshs primes_clisp.fas primes.lib Main.hi primes_clisp.lib primes_clisp.o primes.hi primescsieve gst.im primesalt2c primesalt3c primesgo primesrs
+	rm -f *.txt primesgcc primesclang primescpp primesaltc primes.class primespas primes*.exe primes.o primesobjc \
+	primes.ali primesada primesfor primese primes.h primes1.c primes1.o primes.id primes.make primescbl link.res \
+	ppas.sh primes.beam primesocaml primesasm primes.cmi primes.cmx luac.out primeshs primes_clisp.fas primes.lib \
+	Main.hi primes_clisp.lib primes_clisp.o primes.hi primescsieve gst.im primesalt2c primesalt3c primesgo primesrs \
+	primes.jar
diff --git a/autoTest.pl b/autoTest.pl
index 58698f0..2bce589 100755
--- a/autoTest.pl
+++ b/autoTest.pl
@@ -20,7 +20,7 @@ if ($ARGV[0] eq "--debug") {
 #	"c2", "ca", "ca2", "ca3",
 #   Applied some Tiobe 2026 language ordering
     "cpp", "objc", "py", "java", "cs", "js", "vb", "r", "pas", "rs", "go", "php", "ada", "for", "pl",
-    "cbl", "dart", "pro", "lua", "rb", "cl", "oml", "erl", "scala", "hs",
+    "kt", "cbl", "dart", "pro", "lua", "rb", "cl", "oml", "erl", "scala", "hs",
     "scm", "e", "awk", "tcl", "st", "sml", "4th",  "m3", "pike", "rexx",  "fe", "5c", "m4", "sh");
 
 $llen = $#langs+1;
@@ -346,6 +346,13 @@ $data{'scala'}{'compiler0'} = "scalac";
 $data{'scala'}{'interp0'} = "scala";
 $data{'scala'}{'prog'} = "Primes";
 
+$data{'kt'}{'name'} = "Kotlin";
+$data{'kt'}{'src'} = "primes.kt";
+$data{'kt'}{'compiler0'} = "kotlinc";
+$data{'kt'}{'cflags0'} = "-include-runtime -d primes.jar";
+$data{'kt'}{'interp0'} = "java";
+$data{'kt'}{'iflags0'} = "-jar primes.jar $max";
+
 $data{'cs'}{'name'} = "C# (Mono)";
 $data{'cs'}{'src'} = "primes.cs";
 $data{'cs'}{'compiler0'} = "mcs";
diff --git a/primes.kt b/primes.kt
new file mode 100644
index 0000000..87f4be9
--- /dev/null
+++ b/primes.kt
@@ -0,0 +1,19 @@
+import kotlin.math.sqrt
+
+// Kotlin prime number finder
+
+fun main(args: Array<String>) {
+    val max = args[0].toInt()
+    for (n in 3..max step 2) {
+        var isPrime = true
+        for (i in 3..sqrt(n.toDouble()).toInt() step 2) {
+            if (n % i == 0) {
+                isPrime = false
+                break
+            }
+        }
+        if (isPrime) {
+            println(n)
+        }
+    }
+}
\ No newline at end of file