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You can swap two variables, by storing one of them temporarily in a third variable, like this:

temp = a;

a = b;

b = temp;

Inside a function, this won't work, because the function parameters are COPIES of the original variables, not the variables themselves. Any change won't affect the original variables. If you work with OBJECTS, and swap the CONTENTS of the objects (not the object pointers), it can work, though.

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