bwBASIC 2.50

Version of implementation Bywater BASIC of programming language Basic

The last version of Bywater BASIC, released in 1997.

Examples:

Hello, World! - Basic (31):

PRINT "Hello, World!"

Factorial - Basic (464):

Factorials are calculated iteratively. Note the type inference: data type for storing factorial values is not declared explicitly, and yet the larger values are calculated without an overflow error. 

f = 1
FOR i = 0 TO 16
    PRINT i; "! ="; f
    f = f * (i + 1)
NEXT i

Fibonacci numbers - Basic (465):

This example shows iterative calculation of Fibonacci numbers and storing them in an array. Note the explicit array declaration and the string variable S$ — string variables names must end with a $. 

DIM F(16)
F(1) = 1
F(2) = 1
FOR i = 3 TO 16
    F(i) = F(i - 1) + F(i - 2)
NEXT i
S$ = ""
FOR i = 1 TO 16
    S$ = S$ + STR$(F(i)) + ","
NEXT i
S$ = S$ + " ..."
PRINT S$