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51 lines
2.3 KiB
Markdown
51 lines
2.3 KiB
Markdown
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# Hints
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## General
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- `while` loops are used for _indefinite_ (uncounted) iteration
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- `for` loops are used for _definite_, (counted) iteration.
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- The keywords `break` and `continue` help customize loop behavior.
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- `std::to_string()` from `string` library can be used to convert a integer to string
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Also being familiar with the following can help with completing the tasks:
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- [`vectors`][vectors]: indexing, size, [`<vector>.emplace_back`][emplace], [`<vector>.pop_back()`][pop].
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- [`string`][string]: using the `+` to concatenate strings, integer to string conversion, [`to_string`][to\_string].
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## 1. Rounding Scores
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- `While` loops will continue to execute until their test condition evaluates to `False`.
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- `<vector>.back()` will return the last item in a `vector`.
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- `<vector>.pop_back()` will remove the last item in a `vector`.
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## 2. Non-Passing Students
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- A results counter does need to be set up and _incremented_ -- you'll want to `return` the count of non-passing students when the loop terminates.
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## 3. The "Best"
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- - Having an empty `vector` to add the "best" marks to is helpful here.
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- `<vector>.emplace_back()` can help add things to the results `vector`.
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## 4. Calculating Letter Grades
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- These are _lower thresholds_. The _lower threshold_ for a "D" is a score of **41**, since an "F" is **<= 40**.
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- `static_cast<int>` without parameters should round off increments nicely.
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- You are expected to return an array, not a vector.
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## 5. Matching Names to Scores
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- If both containers are the same length and sorted the same way, could you use the `index` from one to retrieve a `value` from the other?
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- `std::to_string(int)` can be used to convert a number to string.
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- Don't forget the follow the format of the example's output.
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## 6. A "Perfect" Score
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- There may be or may not be a student with a score of 100, and you can't return an empty string without checking **all** scores.
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- The `control flow` statements `continue` and `break` may be useful here to move past unwanted values.
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[vectors]: https://en.cppreference.com/w/cpp/container/vector
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[string]: https://en.cppreference.com/w/cpp/string/basic_string
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[to\_string]: https://en.cppreference.com/w/cpp/string/basic_string/to_string
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[emplace]: https://en.cppreference.com/w/cpp/container/vector/emplace_back
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[pop]: https://en.cppreference.com/w/cpp/container/vector/pop_back
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