diff --git a/Homework/bintreeCalk/app b/Homework/bintreeCalk/app
new file mode 100755
index 0000000..0ae1255
Binary files /dev/null and b/Homework/bintreeCalk/app differ
diff --git a/Homework/bintreeCalk/head.h b/Homework/bintreeCalk/head.h
index 19448bb..c8892ae 100644
--- a/Homework/bintreeCalk/head.h
+++ b/Homework/bintreeCalk/head.h
@@ -8,3 +8,18 @@ typedef struct tree
     struct tree *left;
     struct tree *right;
 } Tree;
+
+Tree *tnew(void);
+Tree *leaf(char c);
+Tree *maketree(char expr[], int first, int last);
+unsigned char priority(char c);
+int lastop(char expr[], int first, int last);
+int calculate(Tree *root);
+void showtree(Tree *root, int level);
+Tree *create(unsigned char key);
+Tree *add(Tree *root, unsigned char key);
+Tree *search(Tree *root, unsigned char key);
+Tree *min(Tree *root);
+Tree *max(Tree *root);
+Tree *nextdel(Tree *root);
+void delete(Tree *del);