assignment operator... i think

Hi
I have come accross this in my programming book...

Code:

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+=

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This is probably very easy but i have no idea what it is.

Thanks in advance.

It takes the value you have and adds something to it.
Its the same as doing:
int a = 10;
a= a+ 4;

Thanks

There's a good chance that the index of your book lists these symbols before "A".

Basically, C++ has quite a few "composite assignment" operators of the form op=, where op is any of [+, -, *, /, &#37;, &, |, ~, <<, >>] and perhaps more that I forgot. They all are defined such that
expr1 op= expr2
is equivalent to
expr1 = expr1 op expr2
except that expr1 is evaluated only once.