Undefined values: Difference between revisions
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→{{header|Mathematica}}
m (→{{header|Prolog}}: typo) |
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Line 805:
5</pre>
=={{header|Mathematica}}/{{header|Wolfram Language}}==
Mathematica is a symbolic mathematical software. Variables without given values are treated as symbols.
<lang Mathematica>a
-> a
a + a
-> 2 a
ValueQ[a]
-> False
a = 5
-> 5
ValueQ[a]
-> True</lang>
Line 830 ⟶ 826:
<lang Mathematica>a = Undefined
-> Undefined
a
-> Undefined
ValueQ[a]
-> True</lang>
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