Functions can only be defined using the single line DEF FNf(x)= statement (e.g., DEF FNLOG(base,number)=LOG(number)/LOG(base)). All IF/THEN/ELSE conditional statements must be written on one line, although WHILE/WEND statements may group multiple lines. There is little support for structured programming in GW-BASIC. The GW-BASIC command-line environment has commands to RUN, LOAD, SAVE, LIST the current program, these commands can also be used as program statements.
Program source files are normally saved in binary compressed format with tokens replacing commands, with an option to save in ASCII text form. All program lines must be numbered all non-numbered lines are considered to be commands in direct mode to be executed immediately. Like other early microcomputer versions of BASIC, GW-BASIC lacked many of the structures needed for structured programming such as local variables, and GW-BASIC programs executed relatively slowly, because it was an interpreted programming language. It also includes function key shortcuts at the bottom of the screen. Using the cursor movement keys, any line displayed on screen can be edited. GW-BASIC has a command line-based integrated development environment (IDE) based on Dartmouth BASIC. it is also a low-cost way for many aspiring programmers to learn the fundamentals of computer programming.
The language is suitable for simple games, business programs and the like. GW-BASIC is a dialect of the BASIC programming language developed by Microsoft from BASICA, originally for Compaq.
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