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. | + | <syntaxhighlight lang="pascal" inline>NaN</syntaxhighlight> (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. | + | <syntaxhighlight lang="pascal" inline>NaN</syntaxhighlight> is not the same as infinity. |
| − | |||
| − | |||
| − | |||
| + | <syntaxhighlight lang="pascal" line highlight="3-4"> | ||
| + | program NotANumber(input, output, stderr); | ||
begin | begin | ||
| − | + | // writes 'Nan' (with spacing) on its own line | |
| − | + | writeLn(0/0); | |
end. | end. | ||
| − | </source> | + | </syntaxhighlight> |
| + | |||
| + | Note, <syntaxhighlight lang="pascal" inline>NaN</syntaxhighlight> exists only in the context of floating point number calculations: | ||
| + | <syntaxhighlight lang="pascal" inline>0 div 0</syntaxhighlight> ([[Div|integer division]]) is not allowed, though. | ||
| + | |||
| + | == 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”]] | ||
Latest revision as of 17:16, 6 August 2022
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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.
1program NotANumber(input, output, stderr);
2begin
3 // writes 'Nan' (with spacing) on its own line
4 writeLn(0/0);
5end.
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”
