LANGUAGE » RUST

Macro

Last updated:
Reference:doc.rust-lang.org

Print ​

Available default macros for printing and formatting string:

MacroDescription
print!Prints to STDOUT without newline.
println!Prints to STDOUT with newline.
eprint!Prints to STDERR without newline.
eprintln!Prints to STDERR with newline.
format!Returns a formatted string.

Usage:

rust
println!("My name is {}, I'm {} years old.", "Kai", 15);
println!("My name is {0}, I'm {1} years old.", "Kai", 15);
println!("My name is {name}, I'm {age} years old.", name="Kai", age=15);

Text formatting:

rust
println!("'{:<15}'", "left");
println!("'{:^15}'", "center");
println!("'{:>15}'", "right");
println!("'{:_<width$}'", "left", width=15);
println!("'{:_^width$}'", "center", width=15);
println!("'{:_>width$}'", "right", width=15);

Integer formatting:

rust
println!("Base {:>2} : {:b}", 2, 20);
println!("Base {:>2} : {:o}", 8, 20);
println!("Base {:>2} : {}", 10, 20);
println!("Base {:>2} : {:x}", 16, 20);

Float formatting:

rust
let pi = 3.141592;
println!("Pi is roughly {pi:.3}");