support for 64 bit targets

Author: rswier

README.md

@@ -5,7 +5,7 @@ An exercise in minimalism.
 
 Try the following:
 
-    gcc -o c4 c4.c  (you may need the -m32 option on 64bit machines)
+    gcc -o c4 c4.c
     ./c4 hello.c
     ./c4 -s hello.c
 

c4.c

@@ -11,6 +11,7 @@
 #include <memory.h>
 #include <unistd.h>
 #include <fcntl.h>
+#define int long long
 
 char *p, *lp, // current position in source code
      *data;   // data/bss pointer