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SDL symbols help

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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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