1. Electronic computing apparatus comprising: keyboard input means having a plurality of alphanumeric keys for entering alphanumeric information, including BASIC languge statements, into the computing apparatus, and having an execution control key for initiating immediate execution of a valid, individual, self-contained BASIC language statement entered into the computing appartaus; first storage means, coupled to the keyboard input means, for storing said BASIC language statement as it is being entered into the computing apparatus from the keyboard input means; second storage means, coupled to the first storage means, for storing alphanumeric information, including BASIC language statements, that has been entered into the computing apparatus from the keyboard input means; third storage means for storing routines and subroutines of instructions to be executed in executing BASIC language statements; processing means, coupled to the keyboard input means and to the first, second, and third storage means, for executing the routines and subroutines stored in the third storage means to execute BASIC language statements; said processing means including recognition and selection means for syntactically recognizing a string of alphanumeric characters stored in the first storage means as being a valid, self-contained BASIC language statement and for selecting the routines and subroutines stored in the third storage means to be executed for immediately executing the recognized valid, self-contained BASIC language statement; said processing means including means responsive to actuation of the execution control key following entry from the keyboard input means of said string of alphanumeric characters representing a valid, self-contained BASIC language statement for executing the routines and subroutines stored in the third storage means that have been selected by the recognition and selection means to execute the valid, self-contained BASIC language statement represented by said entered string of alphanumeric characters; and output means, coupled to the processing means, for providing an output of results obtained from executing BASIC language statements.