Write the field out in binary
A diagnostics screen prints a flags field as ones and zeros so an engineer can see at a glance which switches are on.
- Return the binary digits, most significant first.
- No leading zeros — except zero itself, which is written "0".
- The value is never negative.
ToBinary(flags: int) → string
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
public string ToBinary(int flags) {
}Worked examples
| Call | Result |
|---|---|
ToBinary(5) | "101" |
ToBinary(0) | "0" |
ToBinary(1) | "1" |
ToBinary(8) | "1000" |
Hint
Peel off the lowest bit with a mask, shift down, and repeat. The digits come out backwards, so reverse them at the end.
Reference solution in C#
public string ToBinary(int flags) {
if (flags == 0) return "0";
var digits = new List<char>();
int field = flags;
while (field > 0) {
digits.Insert(0, (char)('0' + (field & 1)));
field >>= 1;
}
return new string(digits.ToArray());
}