Difference between revisions of "NaN"
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<syntaxhighlight lang="pascal" enclose="none">NaN</syntaxhighlight> is not the same as infinity. | <syntaxhighlight lang="pascal" enclose="none">NaN</syntaxhighlight> is not the same as infinity. | ||
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program NotANumber(input, output, stderr); | program NotANumber(input, output, stderr); | ||
begin | begin | ||
Revision as of 16:23, 30 April 2018
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English (en) │
suomi (fi) │
русский (ru) │
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”
