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AddTo
x
+=
dx adds dx to x and returns the new value of x.
AddTo has the attribute HoldFirst.
x
+=
dx is equivalent to x
=
x
+
dx.
See the Mathematica book: Section 2.4.4.
See also: Increment, PreIncrement, Set, PrependTo.
Further Examples
This initializes the variable i to the value 7, adds to it, checks its value, and clears it at the end.
In[1]:= 
Out[1]= 
In[2]:= 
Out[2]= 
In[3]:= 
Out[3]= 
In[4]:= 
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