Course of Raku / Objects, I/O, and exceptions / Input and output / Standard streams / Exercises

Note a warning

Problem

A program processes a value that turns out to be negative. Use note to send a warning to standard error when the value is below zero, and say to send the real result — its absolute value — to standard output. Use the value -3.

Example

Both lines appear on the screen:

Warning: the value is negative
3

If standard error is discarded, only the result remains:

$ raku note-a-warning.raku 2>/dev/null
3

Solution

✅ See the solution

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