BASIC-DOS

BASIC-DOS BASIC Commands

DEF

The DEF statement defines single-line functions:

DEF name[(argument[,argument]…)]=expression

The DEF statement can also define multi-line functions, but only from within a BASIC program:

DEF name[(argument[,argument]…)]
statement(s)
RETURN expression

Example:

10 LET PI = 3.141593  
20 DEF AREA(R) = PI * R^2  
30 INPUT "Radius? ", RADIUS  
40 PRINT "Area is "; AREA(RADIUS)  
RUN  
Radius? 2  
Area is 12.56637  

Like variables, functions defined within a BASIC program remain defined after the program terminates and can be used in immediate (“Direct Mode”) expressions:

PRINT "Area is "; AREA(2)  
Area is 12.56637  

Differences from Microsoft BASIC

BASIC-DOS does not require function names to begin with the letters FN, it allows single-line functions to be defined immediately (in “Direct Mode”), and it allows multi-line functions.

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