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# SDL symbols help

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Hi guys, might be a bit of a newbie question, but what is the += and -= sign in SDL
I've seen it in many tut but what does it mean.

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It has nothing to do with SDL as such. It's a language feature that acts as a shorcut for adding to / subtracting from an existing variable:

 int foo = 0; foo = foo + 2; // add 2 to foo -> foo is now 2 foo += 2; // same as line above, add 2 to foo -> foo is now 4 foo = foo - 2; // subtract 2 from foo -> foo is now 2 foo -= 2; // same as line above, subtract 2 from foo -> foo is now 0 

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Oh, okay thanks
Keep that in mind when shortening my code

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