Step 2: Immediate Constants

1 files changed, 26 insertions, 1 deletions

diff --git a/test.c b/test.c
index 2d814e0..f41ae64 100644
--- a/test.c
+++ b/test.c
@@ -1,6 +1,31 @@
 #include <stdio.h>
 
+#define fixnum_mask 3
+#define fixnum_tag 0
+#define fixnum_shift 2
+#define char_mask 255
+#define char_shift 8
+#define char_tag 15
+#define boolean_mask 127
+#define boolean_shift 7
+#define boolean_tag 31
+#define empty_list 47
+
 int main(int argc, char** argv) {
-  printf("%d\n", scheme_entry());
+  int val = scheme_entry();
+
+  if((val & fixnum_mask) == fixnum_tag) {
+    printf("%d\n", val >> fixnum_shift);
+  } else if((val & char_mask) == char_tag) {
+    printf("%c\n", val >> char_shift);
+  } else if((val & boolean_mask) == boolean_tag) {
+    if((val >> boolean_shift) == 1) {
+      printf("#t\n");
+    } else {
+      printf("#f\n");
+    }
+  } else if(val == empty_list) {
+    printf("()\n");
+  }
   return 0;
 }