Add helpful hint on io function for beginners
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@ -144,6 +144,16 @@
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//! # Ok(())
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//! # }
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//! ```
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//! Note that you cannot use the `?` operator in functions that do not return a `Result` (e.g. `main()`).
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//! Instead, you can `match` on the return value to catch any possible errors:
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//!
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//! ```
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//! let mut input = String::new();
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//! match io::stdin().read_line(&mut input) {
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//! Err(why) => panic!("Failed to read input: {}", why.description()),
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//! Ok(_) => println!("You typed: {}", input.trim()),
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//! }
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//! ```
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//!
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//! And a very common source of output is standard output:
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//!
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