From 722e0ef0ea2624c1cd9bd5ca69833e37dc09f97f Mon Sep 17 00:00:00 2001
From: Mike Buland <mike@xagasoft.com>
Date: Wed, 8 May 2013 15:26:41 -0600
Subject: Added a funny option to generate primes.

...But primes in base 36 and it skips all numbers with digits in the
range 0-9
---
 src/options.cpp | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/options.h   |  1 +
 2 files changed, 52 insertions(+)

diff --git a/src/options.cpp b/src/options.cpp
index 4fcf1e2..7f66028 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -1,13 +1,17 @@
 #include "options.h"
 
 #include "unitnumber.h"
+#include "number.h"
 
+#include <bu/sio.h>
 #include <stdlib.h>
 
 Options::Options( int argc, char *argv[] )
 {
     addOption( Bu::slot(this, &Options::selfTest), "self-test",
         "Run a series of tests to ensure everything is working correctly.");
+    addOption( Bu::slot(this, &Options::textPrimes), "text-primes",
+        "Generate primes in base 36 that only have digits > 9 in them.");
     addHelpOption('h', "help", "This help");
 
     parse( argc, argv );
@@ -22,5 +26,52 @@ int Options::selfTest( Bu::StringArray )
     UnitNumber().run();
 
     exit( 0 );
+    return 0;
+}
+
+bool hasDigits( const Bu::String &s )
+{
+    for( Bu::String::const_iterator i = s.begin(); i; i++ )
+    {
+        if( *i >= '0' && *i <= '9' )
+            return true;
+    }
+    return false;
+}
+
+int Options::textPrimes( Bu::StringArray )
+{
+    Number tst( 0, 36 );
+    Number max( 0, 36 );
+    Number j( 0, 36 );
+    Number one( 0, 36 );
+    Number fact( 0, 36 );
+    one = "1";
+    fact = "2";
+
+    for( tst = "1";; tst = tst + one )
+    {
+        if( hasDigits( tst.toString() ) )
+            continue;
+
+        max = tst / fact;
+        bool bPrime = true;
+        for( j = "2"; j < max; j = j + one )
+        {
+            if( (tst%j).isZero() )
+            {
+                bPrime = false;
+                break;
+            }
+        }
+
+        if( bPrime )
+        {
+            Bu::println("%1").arg( tst );
+        }
+    }
+    
+    exit( 0 );
+    return 0;
 }
 
diff --git a/src/options.h b/src/options.h
index 667e486..11bf896 100644
--- a/src/options.h
+++ b/src/options.h
@@ -11,6 +11,7 @@ public:
 
 private:
     int selfTest( Bu::StringArray aArgs );
+    int textPrimes( Bu::StringArray aArgs );
 };
 
 #endif
-- 
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