In computing, direct or immediate mode
in an interactive programming system is the immediate execution of
commands
Command may refer to:
Computing
* Command (computing), a statement in a computer language
* COMMAND.COM, the default operating system shell and command-line interpreter for DOS
* Command key, a modifier key on Apple Macintosh computer keyboards
* ...
,
statements
Statement or statements may refer to: Common uses
* Statement (computer science), the smallest standalone element of an imperative programming language
*Statement (logic), declarative sentence that is either true or false
*Statement, a declarativ ...
, or
expressions. In many interactive systems, most of these can both be included in programs or executed directly in a
read–eval–print loop
A read–eval–print loop (REPL), also termed an interactive toplevel or language shell, is a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user; a program written ...
(REPL).
Most interactive systems also offer the possibility of defining programs in the REPL, either with explicit declarations, such as
Python's
def, or by labelling them with
line numbers
In computing, a line number is a method used to specify a particular sequence of characters in a text file. The most common method of assigning numbers to lines is to assign every line a unique number, starting at 1 for the first line, and incre ...
. Programs can then be run by calling a named or numbered procedure or by running a main program.
Many programming systems, from
Lisp
A lisp is a speech impairment in which a person misarticulates sibilants (, , , , , , , ). These misarticulations often result in unclear speech.
Types
* A frontal lisp occurs when the tongue is placed anterior to the target. Interdental lispi ...
and
JOSS Joss may refer to:
* Joss (name), including a list of people with the name
* JOSS, a time-sharing programming language
* Joss (Chinese statue), a religious object
* Joss JP1, an Australian-built supercar
* Joss paper, a type of burnt offering ...
to
Python and
Perl
Perl is a family of two High-level programming language, high-level, General-purpose programming language, general-purpose, Interpreter (computing), interpreted, dynamic programming languages. "Perl" refers to Perl 5, but from 2000 to 2019 it ...
have interactive
REPLs which also allow defining programs. Most
integrated development environment
An integrated development environment (IDE) is a software application that provides comprehensive facilities to computer programmers for software development. An IDE normally consists of at least a source code editor, build automation tools a ...
s offer a direct mode where, during
debugging
In computer programming and software development, debugging is the process of finding and resolving ''bugs'' (defects or problems that prevent correct operation) within computer programs, software, or systems.
Debugging tactics can involve in ...
and while the program execution is suspended, commands can be executed directly in the current scope and the result is displayed.
Example
;Non-direct mode in Basic
;Direct mode in Basic
References
{{reflist
User interfaces
Computing terminology