Add C reference

printu16.c

@@ -0,0 +1,25 @@
+#include <stdio.h>  // putchar()
+#include <stdlib.h> // strtoul()
+
+void printu16( unsigned x )
+{
+    char digits[6];
+    int  len = 0;
+
+    do
+    {
+        digits[ len++ ] = (x % 10);
+        x /= 10;
+    }
+    while( x );
+
+    while( len --> 0 )
+        putchar( '0' | digits[ len ] );
+}
+
+int main( const int nArg, const char *aArg[] )
+{
+    printu16( nArg > 1 ? strtoul(aArg[1],NULL,16) : 0x1234 );
+    return putchar( '\n' );
+}
+