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Be more precise about printing in compound-types.md (#1421)

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Fixes #1412.
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Martin Geisler 2023-10-24 11:32:34 +02:00 committed by GitHub
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commit e6e4d50eef
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1 changed files with 5 additions and 5 deletions
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10
src/basic-syntax/compound-types.md
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@ -12,7 +12,7 @@ Array assignment and access:
fn main() {
let mut a: [i8; 10] = [42; 10];
a[5] = 0;
println!("a: {:?}", a);
println!("a: {a:?}");
}
```
@ -39,10 +39,10 @@ Arrays:
* We can use literals to assign values to arrays.
* In the main function, the print statement asks for the debug implementation with the `?` format
parameter: `{}` gives the default output, `{:?}` gives the debug output. We
could also have used `{a}` and `{a:?}` without specifying the value after the
format string.
* The `println!` macro asks for the debug implementation with the `?` format
parameter: `{}` gives the default output, `{:?}` gives the debug output. Types such as
integers and strings implement the default output, but arrays only implement the debug output.
This means that we must use debug output here.
* Adding `#`, eg `{a:#?}`, invokes a "pretty printing" format, which can be easier to read.