Println! macro
The println! macro is an output operation that formats arguments and writes the resulting text followed by a line terminator to standard output.
Learn Rust in a Month of Lunches
The println! macro formats its arguments and writes the resulting text followed by a newline to standard output.
- How it is used
- Uses `println!` to print text and formatted values, followed by a newline.
- How deep it goes
- Works from basic placeholders through Debug, escapes and formatting options, without explaining macro internals.
- Examples
- Shows a greeting with an inserted number, a Display compiler error, and examples of number bases and aligned output.
- What you can do after
- Apply it in Rust to print formatted values and use compiler feedback to choose a supported placeholder.
Read how Learn Rust in a Month of Lunches explains println! macro →
Rust in Action: Systems programming concepts and techniques
println! is Rust's standard macro for printing formatted output followed by a newline.
- How it is used
- Prints fixed or formatted values to the console while introducing Rust’s macro syntax.
- How deep it goes
- Explains macro notation, stdout, placeholders, and type handling, but treats macros as function-like rather than exposing expansion internals.
- Examples
- Demonstrates greetings in three languages, iterated strings, formatted placeholders, and CSV-processing output.
- What you can do after
- Apply it via Rust syntax to print messages and formatted values during small programs and data-processing tasks.
Read how Rust in Action: Systems programming concepts and techniques explains println! macro →
Related concepts
- Displayuses · Display is Rust’s standard formatting trait for producing a user-facing textual representation of a value.
- dbg! macroalternative to · The Rust dbg! macro evaluates an expression, prints debugging information including its source and value, and returns the expression’s value.
- format! macroalternative to · The Rust format! macro constructs and returns a String by interpolating arguments according to a formatting specification.
- Debuguses · Debug is a Rust standard-library trait for formatting values in programmer-oriented diagnostic representations.
- macrokind of · A macro is a named construct that expands or transforms source code, commands, or templates before or during execution.
- formattinguses · Formatting is the arrangement or transformation of content, data, or code according to specified structural, stylistic, or presentation conventions.
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