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The square root example has to do with specifying the properties of the results of a computation of a function. We might also consider situations where the effect of a particular operation is to change the attribute values for some class. How might we do that? Well, lets consider the example of a bank account. And has an attribute which is the current balance and has operations for deposits and withdraws. We might wish to guarantee that the balance, the current balance reflects any deposits that are made and any withdrawals that are taken out. How might we express such a constraint? Well heres an example, if we have a deposit operation in the account class, that takes a real argument. Which is the amount being deposited and as the sanity check we make sure that the amount is greater than 0, thats the precondition. We might try to express the post-condition with something like saying the balance equals balance plus the amount. However, remember that the OCL is a declarative language.