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why ! after println in rust

Himanshu Jangid answered on December 29, 2022 Popularity 5/10 Helpfulness 2/10

answer why ! after println in rust

why ! after println in rust

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In Rust, the ! symbol is used to indicate a "macro" rather than a function. Macros are a way to define code that generates code, and they can be used to define custom control flow, code generation, and other advanced features.

The println! macro is used to print a line of output to the console. It takes a series of arguments, which can be any type that implements the std::fmt::Display trait, and prints them to the console with a newline at the end.

The ! at the end of the name indicates that this is a macro rather than a function. In Rust, macros are invoked using the ! syntax, which is why you'll see println! rather than println.

Here's an example of using the println! macro to print a message to the console:

println!("Hello, world!");

This will print the message "Hello, world!" to the console, followed by a newline.

Popularity 5/10 Helpfulness 2/10 Language rust

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Tags: println rust

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Contributed on Dec 29 2022

Himanshu Jangid

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why ! after println in rust

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