The lab states the following:

In the real world one finds that the following differences between savings and checking accounts at banking institutions:
| Characteristic/Behavior | Savings | Checking |
| Accepts deposits (Positive values) | Yes | Yes |
| Accepts withdrawals (Negative values) | Yes | Yes |
| Accrues interest on positive balances | Yes | No |
| Only positive balances permitted (zero or greater) | Yes | No |
| Overdraft facilities (negative balances allowed) | No | Yes |
| Interest charges on negative balances | No | Yes |
Is it OK to go a little further than my interpretation of the Lab requirements?
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