--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fact-e.c	Sat Mar 21 09:15:18 2020 +0900
@@ -0,0 +1,48 @@
+#define __environment _CbC_environment
+#define __return _CbC_return
+
+#include "stdio.h"
+#include "stdlib.h"
+
+struct F { int n; int r; int o; void *env; 
+       __code (*next)( struct F );
+       __code (*exit)( struct F );
+   };
+
+__code factorial(struct F arg)
+{
+    if (arg.n<0) {
+	printf("#0008:err %d!\n",arg.n);
+        exit(1);
+	// goto (*exit1)(0,exit1env);
+    }
+    if (arg.n==0)
+	goto arg.next(arg);
+    else {
+	arg.r *= arg.n;
+	arg.n--;
+	goto factorial(arg);
+    }
+}
+
+__code print(struct F arg);
+
+int main( int ac, char *av[])
+{
+    struct F arg;
+    arg.n = atoi(av[1]);
+    // arg.n = 10;
+    arg.r = 1;
+    arg.o = 1;
+    arg.next = print;
+    arg.exit = 0;
+    arg.env = 0;
+    goto factorial(arg);
+}
+
+__code print(struct F arg)
+{
+    printf("#0032:%d! = %d\n",arg.o, arg.r);
+    exit(0);
+}
+