foo.cpp: In function 'int main()':
foo.cpp:36:43: error: 'printf' was not declared in this scope
   if(bo1&&bo2) printf("Case #%d: Both\n",i);
                                           ^
foo.cpp:37:44: error: 'printf' was not declared in this scope
   if(bo1&&!bo2) printf("Case #%d: Heap\n",i);
                                            ^
foo.cpp:38:43: error: 'printf' was not declared in this scope
   if(!bo1&&bo2) printf("Case #%d: BST\n",i);
                                           ^
foo.cpp:39:48: error: 'printf' was not declared in this scope
   if(!bo1&&!bo2) printf("Case #%d: Neither\n",i);
                                                ^