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Diffstat (limited to 'Exceptions/README.md')
| -rw-r--r-- | Exceptions/README.md | 31 |
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diff --git a/Exceptions/README.md b/Exceptions/README.md index df654d3..9350a28 100644 --- a/Exceptions/README.md +++ b/Exceptions/README.md @@ -6,14 +6,39 @@ The example in this section is a derivative of the function reference summary in ## Source -### +### exceptions.b:17,26 +This section calculates numbers within the fibonacci sequence to a given interval. In this case, the first 5 numbers are calculated within the sequence. +Note the call to the `raise` keyword after the fibonacci calculations have completed, but before the program exits. -## Demo +### exceptions.b:31,47 + +The `fibonacci()` function attempts to perform a `fib()` call and, if an exception `e` is thrown, attempts to handle the exception in a manner depending on the exception type. + +Note that the attempted operation is wrapped in a `{ ... }` block. + +### exceptions.b:49,63 +The `raises` clause allows for warnings to be generated for un-caught exception potential within a program. Note that these exception types can be user-defined. + +The `FIB` exception type is defined at: exceptions.b:12 + +## Demo + ; limbo exceptions.b + ; exceptions + F(0) = 1 + F(1) = 1 + F(2) = 2 + F(3) = 3 + F(4) = 5 + sh: 798 "Exceptions":going down! + ; ## Exercises -- +- Try removing the raise for "going down!". +- Remove the `i < 5` portion of the for loop, how many values are printed and why? +- Try removing the exception-catching block from around calls to `fib()`, do you get warnings? +- Try changing the raise type within `fib()`, does `fibonacci()` handle the exception `e` differently? |