diff --git a/lookup3.c b/lookup3.c
index 959d7a6..b802b97 100644
--- a/lookup3.c
+++ b/lookup3.c
@@ -1,5 +1,7 @@
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
 
@@ -61,3 +63,12 @@ uint32_t lookup3(const void *key, size_t length, uint32_t initval) {
     final(a, b, c);
     return c;
 }
+
+int main(void) {
+    char *a = "Hello!\0";
+    int   len = strlen(a);
+
+    uint32_t hash = lookup3(a, len, 0);
+
+  printf("%.8X\n", hash);
+}