how can i check if a string is numeric

Production I.
Mannheim,

Nov 17, 2016
2 Posts

0 ✔  |  ✗ 0  

Re: how can i check if a string is numeric

hi,
i want to check if string ist numeric
i have try with procedure val with base 10, but  i have the problem with this call val("123abc", 10).
i want that convert "123abc" to numeric causes  a error.
how can i check if all chars of string are numeric ? i think convert sring to char array and check every char if it in the interval 0-9

thanks in advance
youssef

DrATEasy (Ron Y.)
Mission Viejo, CA

Nov 17, 2016
371 Posts

0 ✔  |  ✗ 0  

Re: how can i check if a string is numeric

procedure IsValidInteger(s: Val String) : Long
iLast : Long
c:Char
{
iLast=Len(s)-1
for i=0 to iLast
    c=s[i]
    if c<'0' and c>'9' then  return False
next

return  True
}

You can change the procedure also to return the last numeric character or enhance to support floating point.

Ronnie

Solution Available
Production I.
Mannheim,

Nov 17, 2016
2 Posts

1 ✔  |  ✗ 0  

Re: how can i check if a string is numeric

Hi Ronnie,
thank you for the quiqly response.
in the if statement should "or" instead of "and" used and i have a check added if the string is empty.
that works now

iLast = Len(s) - 1
if iLast = -1
    ! empty string
    return False
endif
for lCounter=0 to iLast
    c=s[lCounter]
    if c<'0' or c>'9' then  return False
next

return  True

DrATEasy (Ron Y.)
Mission Viejo, CA

Nov 18, 2016
371 Posts

0 ✔  |  ✗ 0  

Re: how can i check if a string is numeric

Great!



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