Web Reference: Mar 25, 2026 · This macro uses the same syntax as format!, but writes to the standard output instead. See std::fmt for more information. The println! macro will lock the standard output on each call. If you call println! within a hot loop, this behavior may be the bottleneck of the loop. To avoid this, lock stdout with io::stdout().lock(): Oct 23, 2023 · In this article, we learned how to format output with print! and println! macros in Rust. It’s essential to remember that print! and println! are macros, not functions, hence the ! at the end of their names. May 12, 2021 · Overloading is cool, but macros are a better solution, because you're doing all that work at compile time. You get all the benefits of dynamic arguments, while not having to deal with it at runtime.
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