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docs: mention round-to-even in precision formatting #120967

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merged 3 commits into from
Feb 13, 2024
Merged

docs: mention round-to-even in precision formatting #120967

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docs: mention round-to-even in precision formatting
LeoDog896 Feb 12, 2024
30f6665
style: fmt
LeoDog896 Feb 12, 2024
0f53e72
docs: use correct link, use secondary example
LeoDog896 Feb 13, 2024
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16 changes: 16 additions & 0 deletions library/alloc/src/fmt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -278,6 +278,22 @@
//! Hello, ` 123` has 3 right-aligned characters
//! ```
//!
//! When truncating these values, Rust uses [round half-to-even](https://en.wikipedia.org/wiki/Rounding#Rounding_half_to_even),
//! which is the default rounding mode in IEEE 754.
//! For example,
//!
//! ```
//! print!("{0:.1$e}", 12345, 3);
//! print!("{0:.1$e}", 12355, 3);
//! ```
//!
//! Would return:
//!
//! ```text
//! 1.234e4
//! 1.236e4
//! ```
//!
//! ## Localization
//!
//! In some programming languages, the behavior of string formatting functions
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