// p05input7.txt - Test Level()

# Test level as tree grows level by level
c
+  555  Lincoln    Abraham
+  1000 Madison    James
+  1234 Jefferson  Thomas
+  5678 Washington George
p
? 555
? 1000
? 1234
? 5678
d


# Test level as with a more balance tree
c
+  555  Lincoln    Abraham
+  1000 Madison    James
+  1234 Jefferson  Thomas
+  5678 Washington George
+  888  Nixon      Richard
p
? 555
? 1000
? 1234
? 5678
? 888
d


# Test level with single node tree
c
+  888  Nixon      Richard
p
? 888
d


# Test level with empty tree
c
p
? 888
d