Download - True BASIC

428 True BASIC Language System
Example:
One Million
and passing a value of 1000000000 results in a return value of:
One Billion
Note that the results of the ENGLISHNUM$ function can be wrong for very large numbers
(usually those greater than 9,000,000,000) because of the inaccuracy introduced by floating
point round off errors.
The following program:
LIBRARY “STRLIB.TRC”
DECLARE DEF EnglishNum$
Exceptions:
See also:
EVAL Function
Library:
Syntax:
Usage:
Summary:
Details:
FOR i = 1 to 10
FOR j = 1 to 10
PRINT EnglishNum$(i); “ times “; EnglishNum$(j);
PRINT “ is “; EnglishNum$(i*j)
NEXT j
NEXT i
GET KEY k
END
produces a multiplication table in English (that is, without using digits).
None
ROMAN$
STRLIB.TRC
EVAL (strex)
LET result = EVAL (expression$)
Returns the value of the constant-based expression represented by the contents of its string
argument.
The EVAL function evaluates the numeric expression represented by the value of
expression$ and returns the resulting value.
The value of expression$ must represent a numeric expression which is valid under the
rules of True BASIC. This expression may contain numeric constants, but not variables.
(For the evaluation of expressions containing variables, see the SUPERVAL subroutine.)
The value of expression$ may incorporate any of the following operators:
Operators Available to EVAL
+ - * / ^ ( )
In addition, the value of expression$ may incorporate any of the following numeric
functions:
Functions Available to EVAL
SIN COS TAN ATN SQR
SINH COSH TANH ASIN ACOS
SEC CSC COT MAXNUM EPS
PI SGN ABS RAD DEG
LOG LOG2 LOG10 EXP RND
INT ROUND IP FP CEIL
DATE
TIME
Note that numeric functions requiring two arguments, including the two-argument form of
the ROUND function, are not available for use in the value of expression$.
Also note that the EVAL function is not as fast as the VAL function, but it is a great deal
more flexible.