Conditional structures: Difference between revisions
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When there is no '''when others''' clause, the compiler will complain about any uncovered alternative. This defends against a common reason for bugs in other languages. I.e., the following code is syntactically incorrect: |
When there is no '''when others''' clause, the compiler will complain about any uncovered alternative. This defends against a common reason for bugs in other languages. I.e., the following code is syntactically incorrect: |
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<lang ada>case Today |
<lang ada>case Today is |
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when Monday => |
when Monday => |
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Compute_Starting_Balance; |
Compute_Starting_Balance; |
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The syntactically correct version: |
The syntactically correct version: |
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<lang ada>case Today |
<lang ada>case Today is |
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when Saturday | Sunday => |
when Saturday | Sunday => |
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null; -- don't do anything, if Today is Saturday or Sunday |
null; -- don't do anything, if Today is Saturday or Sunday |
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