Keep a value inside its range
A slider hands back whatever the user dragged it to, and the settings layer pins it into the range the setting allows.
- Below the bottom becomes the bottom; above the top becomes the top.
- If the two bounds arrive the wrong way round, swap them rather than refusing.
clampToRange(amount: int, low: int, high: int) → int
C++ needs a compiler and Drill does not host one yet, so this page is the reference rather than an exercise: the problem, worked examples, and the solution in full. To type it out, the same problem runs in Python.
Where you start
int clampToRange(int amount, int low, int high) {
}Worked examples
| Call | Result |
|---|---|
clampToRange(5, 1, 10) | 5 |
clampToRange(0, 1, 10) | 1 |
clampToRange(99, 1, 10) | 10 |
clampToRange(5, 10, 1) | 5 |
Hint
Sort the bounds first and the rest is two comparisons.
Reference solution in C++
int clampToRange(int amount, int low, int high) {
int lo = std::min(low, high), hi = std::max(low, high);
return std::min(hi, std::max(lo, amount));
}