🔖 Background Information
In English, a suffix is added to a number when we want to denote an item in an ordered set. For example, I might teach my 1st class of the day after eating my 2nd doughnut and drinking my 3rd coffee.
The pattern for suffixes is:
1st 2nd 3rd 4th 5th ... 10th
11th 12th 13th 14th 15th ... 20th
21st 22nd 23rd 24th 25th ... 30th
31st 32nd 33rd 34th 35th ... 40th
...
101st 102nd 103rd 104th 105th ... 110th
111th 112th 113th 114th 115th ... 120th
121st 122nd 123rd 124th 125th ... 130th
...
201st 202nd 203rd 204th 205th ... 210th
211th 212th 213th 214th 215th ... 220th
221st 222nd 223rd 224th 225th ... 230th
...Note how most numbers have a suffix of “th”, but those that end in 1, 2, and 3 differ slightly. Also note that “1st” and “11th” differ as well.
This problem is available courtesy of Professor Jason James (James, 2017).
🎯 Problem Statement
Write a function called string number_suffix(int n) which returns the suffix of a given integer.
✅ Acceptance Criteria
- Create a function named
number_suffixthat takes a single integer argument. It should return a string which contains the two letter suffix of the number. - The function should return an empty string if the inputted number is less than or equal to zero.
📋 Dev Notes
N/A
🖥️ Example Output
Your unit tests for your function might look something like this:
#include <cassert>
int main() {
assert(number_suffix(0) == "");
assert(number_suffix(1) == "st");
assert(number_suffix(2) == "nd");
assert(number_suffix(4) == "th");
assert(number_suffix(120) == "th");
}📝 Thought Provoking Questions
- How many tests do you need to write to thoroughly test the
number_suffixfunction? - How many digits of the inputted integer do you need to check to determine the suffix?
💼 Add-Ons For the Portfolio
(Two Credits) Number and Suffix Together
Update your function to pass in another argument called include_number. If the argument is set to true, the output will be the number prepended to the suffix. If the argument is set to false, the output will be just the suffix, as it was before. For example:
number_suffix(1, true) // This will return the string "1st"
number_suffix(1, false) // This will return the string "st"We don’t want to change any existing behavior or break any existing tests. Thus, default the include_number argument to false.
number_suffix(1) // This should still return "st"🔗 Useful Links
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