Keypad strokes to text
Here is an old phone keypad with alphabetical letters, a backspace key, and a send button. Each button has a number to identify it and pressing a button multiple times will cycle through the letters on it allowing each button to represent more than one letter. For example, pressing 2 once will return ‘A’ but pressing twicein succession will return ‘B’. You must pause for a second in order to type two characters from the same button after each other: “222 2 22” -> “CAB”.
Create a C# library to translate the key strokes of numbers of the keypad into a string.
Examples:
OldPhonePad(“33#”) => output: E
OldPhonePad(“227*#”) => output: B
OldPhonePad(“4433555 555666#”) => output: HELLO
OldPhonePad(“8 88777444666*664#”) => output: TURING
- a recent version of
.NET
Build the library:
dotnet build OldPhonePad
Run the sample application:
dotnet run --project SampleApp
Run unit tests:
dotnet test OldPhonePadTest