Difference between revisions of "NaN"
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{{NaN}} | {{NaN}} | ||
| − | NaN (not a number) is a numeric data type value representing an undefined or unrepresentable value. | + | <code>NaN</code> (not a number) is a numeric data type value representing an undefined or unrepresentable value. |
These values result from operations which have undefined numerical results. | These values result from operations which have undefined numerical results. | ||
| − | NaN is not the same as infinity. | + | <code>NaN</code> is not the same as infinity. |
| − | |||
| − | |||
| − | |||
| + | <syntaxhighlight> | ||
| + | program NotANumber(input, output, stderr); | ||
begin | begin | ||
| − | + | // writes 'Nan' (with spacing) on its own line | |
| − | + | writeLn(0/0); | |
end. | end. | ||
| − | </ | + | </syntaxhighlight> |
| + | |||
| + | Note, <code>NaN</code> exists only in the context of floating point number calculations: | ||
| + | <code>0 div 0</code> (integer division) is not allowed, though. | ||
== See also == | == See also == | ||
| − | * | + | * {{Doc|package=RTL|unit=math|identifier=nan|text=Value “is not a number”}} |
| − | * | + | * {{Doc|package=RTL|unit=math|identifier=isnan|text=<code>IsNan</code>}} checks whether value is “not a number”. |
| − | * [[ | + | * [[TAChart documentation#Skipping source items|<code>TAChart</code> documentation, § “skipping source items”]] |
Revision as of 02:41, 29 January 2018
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NaN (not a number) is a numeric data type value representing an undefined or unrepresentable value.
These values result from operations which have undefined numerical results.
NaN is not the same as infinity.
program NotANumber(input, output, stderr);
begin
// writes 'Nan' (with spacing) on its own line
writeLn(0/0);
end.Note, NaN exists only in the context of floating point number calculations:
0 div 0 (integer division) is not allowed, though.
See also
- Value “is not a number”
IsNanchecks whether value is “not a number”.TAChartdocumentation, § “skipping source items”
