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The VAL() function is used to convert a string into a real number. By default, it will raise an exception if the input string does not contain a purely numeric representation.
When the index is 0, it also expects the input string to consist entirely of a numeric representation. However, it never raises an exception. Instead the special variable "_integer" is set to 0 and can be tested after the call.
If you use a non-zero index, VAL() will attempt to extract the Nth number from the string. Again, after the function call, the special variable "_integer" will be set to zero if no valid number is found in the string.
print val("123.45") + 1000
1123.45
x$ = '123abc'
print val(x$, 0)
0
print _integer
0
print val(x$, 1)
123
a$ = "There were 11 cats, each had $10,000.56"
cat_count = val(a$, 1) // extracts the 11
pocket_money = val(a$, 2) // extracts 10000.56
a$ = 'We bought 3 tickets. It was -5 degrees outside, We spent 150.34. (858) 829-9506.'
print a$
for i = 1 to 999
num = val(a$, i)
if _integer = 0 then exit for
print i, num
next i
The options help parse strings where the numeric is ambiguous such
as val("123,234.56", 1, 'sep=","') where the number we want is part of a
comma delimited string. This would result in the number 123.
However, val("123,234.56", 1) would result in the number 123234.56Options are:
- sep -- the characters are separators ", "
- ignore -- Ignore the characters "@#"
- neg -- characters indicating a negative number "()"
- euro -- characters part of european currency ",."
print val("123,234.56", 1, 'sep=","')
123
print val("123,234.56", 1)
123234.56
a$ = "The invoice showed (5.612,34) credit"
opt$ = 'neg="()",euro=",."' // handle () for negative and Euros
print val(a$, 1, opt$)
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