tcbasic

tcbasic is a small BASIC Interpreter written in C.

Current Status

The "basics" are done and working. The interpreter implements the Tiny BASIC dialect of BASIC with added support for floating point numbers and many of the built-in mathematical functions in Dartmouth BASIC. Development will continue with the goal of implementing successively more complete dialects of BASIC.

Requirements

• C compiler and standard build tools (make, sh, ...).
• cmake

Building

Standard cmake build (make test runs the test suite):

$ cd bin
$ cmake ..
$ make
$ make test
# make install

Using

Start the interpreter in interactive mode:

$ tcbasic

Execute a program from a file in batch mode:

$ tcbasic sample.bas

Example Program

10 REM Square Root Calculator using Newton's Method

100 LET X = 1337
400 GOSUB 1000
500 PRINT "The square root of ",X," is approximately ",Y
600 END

1000 REM Calculate the square root of a given Number
1001 REM Expects input to be in X. Output will be in Y.
1002 REM Uses Z as a temporary variable.
1050 LET Y = 0.5 * X
1100 LET Z = Y
1200 LET Y = Y-(((Y^2)-X)/(2*Y))
1300 IF Z <> Y THEN GOTO 1100
1400 RETURN

Language Reference

See LANG.md

License

See COPYING for the full license. Here's a summary:

tcbasic - a small BASIC Interpreter written in C.
Copyright (C) 2015, 2016, 2017, 2018, 2020  Thomas Cort <linuxgeek@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.