Null

Null
is a symbol used to indicate the absence of an expression or a result. It is not displayed in ordinary output.

When Null appears as a complete output expression, no output is printed.

MORE INFORMATION

e₁;e₂;...;e_k; returns Null, and prints no output.

Expressions like f[e₁, , e₂] are interpreted to have Null between each pair of adjacent commas.

Null represents the absence of content or elements in such constructs as InputField or Grid.

EXAMPLES

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Basic Examples (2)

When a sequence of commands ends with a semicolon, no output is shown:

In[1]:=

The full form of the output is Null:

In[2]:=

Out[2]//FullForm=

If you forget a semicolon in a program you may see output with Null in it:

In[1]:=

In[2]:=

Out[2]=

This is because the whitespace is interpreted as multiplication. Redefine with a semicolon:

In[3]:=

In[4]:=

Out[4]=