Operators: coding problems

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• Digit Sumeasy

  A cashier wants a quick check digit. For a receipt number, add up all of its decimal digits. The number can be as large as a long, so an int is not enough.

  **Constraints:** 0 <= n <= 10^18.

  Use % to read the last digit and / to drop it.

  Input. One integer n.

  Output. One integer: the sum of the decimal digits of n.

  Example 1 input

  4825
  

  Output

  19
  

  Example 2 input

  1000000000000000000
  

  Output

  1
  

  LanguageC#

  ResetRun against tests

  string[] tokens = Console.In.ReadToEnd().Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries); // your code here
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