There is something wrong with the function; a postcondition is violated.
函数本身可能有错，后置条件没有满足。
An example postcondition: the new balance is the old balance, less the amount withdrawn.
后置条件示例：新的余额就是老的余额扣除取款金额。
An example postcondition: the new balance is the old balance, less the amount withdrawn.
后置条件示例：新的余额就是老的余额扣除取款金额。
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