VS:Str2Num: Difference between revisions
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([[User:Orso.b.schmid|Orso]], 18 Nov. 17): Please be careful with overriding standard routines. I change the name of this routine into MyStr2Num. Thus it won't override the standard Str2Num. | |||
Author unknown, changed so that it doesn't override the standard routine: | |||
<code lang="pas"> | <code lang="pas"> | ||
FUNCTION | FUNCTION MyStr2Num(str :STRING) :REAL; | ||
{This | {This is more robust than Str2Num because it handles unit marks in the string, | ||
robust because it handles unit marks in the string, | |||
while the built-in FUNCTION does not. Returns zero | while the built-in FUNCTION does not. Returns zero | ||
if it fails, which of course does not unambiguously | if it fails, which of course does not unambiguously | ||
| Line 48: | Line 48: | ||
num :REAL; | num :REAL; | ||
BEGIN | BEGIN | ||
MyStr2Num := 0; | |||
IF ValidNumStr(str, num) THEN | IF ValidNumStr(str, num) THEN MyStr2Num := num; | ||
END; | END; | ||
</code></remark> | </code></remark> | ||
Revision as of 06:52, 18 November 2018
.VectorScript|VectorScript ..VS:Function Reference|Function Reference ..VS:Function_Reference_Appendix|Appendix
Description
Function Str2Num returns the specified string as a numeric value.
FUNCTION Str2Num(
s :STRING) : REAL;
def vs.Str2Num(s):
return REAL
Parameters
s STRING Source string.
Remarks
(Orso, 18 Nov. 17): Please be careful with overriding standard routines. I change the name of this routine into MyStr2Num. Thus it won't override the standard Str2Num.
Author unknown, changed so that it doesn't override the standard routine:
FUNCTION MyStr2Num(str :STRING) :REAL;
{This is more robust than Str2Num because it handles unit marks in the string,
while the built-in FUNCTION does not. Returns zero
if it fails, which of course does not unambiguously
indicate failure, but it's the same thing that Str2Num
returns on failure (without the warning). If you need
to know whether or not the FUNCTION succeeded, you
shouldn't be using Str2Num, but ValidNumStr instead.}
VAR
num :REAL;
BEGIN
MyStr2Num := 0;
IF ValidNumStr(str, num) THEN MyStr2Num := num;
END;
Example
VectorScript
numValue:=Str2Num('235.44');
Python
Version
Availability: from All Versions
See Also
VS Functions:
VS Functions:
[[VS:ValidNumStr]]