{"id":7751,"date":"2024-09-27T11:20:43","date_gmt":"2024-09-27T09:20:43","guid":{"rendered":"https:\/\/oopm.org\/?page_id=7751"},"modified":"2025-01-14T14:04:52","modified_gmt":"2025-01-14T13:04:52","slug":"8-1-1-common-superclass","status":"publish","type":"page","link":"https:\/\/oopm.org\/?page_id=7751","title":{"rendered":"8.1.1 Common superclass"},"content":{"rendered":"
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As mentioned, both types of accounts have a withdraw<\/code> method, but the statement part of of these two methods are different.<\/p>\n\n\n\n

We may define the common attributes in a general class Account<\/code> like the one we have defined in the previous chapters:<\/p>\n\n\n\n

class<\/strong> Account(owner: ref<\/strong> Customer):\n   balance: var<\/strong> float\n   interest: var<\/strong> float\n   addInterest:\n      balance := balance + (balance * interestRate) \/ 100\n   deposit(amount: var<\/strong> float):\n      balance := balance + amount\n   withdraw(amount: var<\/strong> float) -> newB: var<\/strong> float:\n      -\"-\n      newB := balance<\/code><\/pre>\n\n\n\n
We have included a partial description of a withdraw<\/code> method to indicate that accounts in general have a withdraw<\/code> method that returns the value of balance<\/code>. In section