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| Other Library Functions | ||||||||||
| function | is-nan |
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Library: omfloat - floating point number support
Include: omfloat.xin |
Return type: Boolean Returns: A value of true when x is NaN; otherwise, a value of false. |
define external switch function FP_isnan value float x
Use is-nan to test a floating point number to determine if it is not a number (NaN). This function returns a switch value of true ("x" is NaN) or false. is-nan provides the only reliable means of determining whether a variable contains a NaN value.
The following "contrived" sample uses isnan to check for a value that is not a number (NaN). When such a value is found, the message "Error, result is not a number." is displayed.
include "omfloat.xin"
process
local float x initial {3}
local stream y initial {"A"}
local float result
set result to (x / y)
do when is-nan result
output "Error, result is not a number. %n"
halt
done
; Output: "Error, result is not a number."
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Other Library Functions constants in floating point FP_IsVersionCompatible FP_LibraryVersion is-nan |
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