Define QBASIC. List two elements of QBASIC

QBASIC is a high level computer language published by Microsoft. QBASIC environment includes a full screen syntax checking, multi-file and multi-facilities, full-pull-down menus, syntax checking editor and a simple yet a power full menu structure that can be drive through either by the keyboard the mouse.
list of two elements are as follows.
A) Characters Set
B) Constant