Custom Formatting

Overview

The std::fmt module allows custom display formatting by implementing the Display and Debug traits.

Code Example

#![allow(unused)]
fn main() {
use std::fmt;

struct Point {
    x: i32,
    y: i32,
}

impl fmt::Display for Point {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "Point({}, {})", self.x, self.y)
    }
}

let point = Point { x: 10, y: 20 };
println!("Custom formatted point: {}", point);
}

Key Concepts

• Display: For user-facing output ({})
• Debug: For programmer-facing output ({:?})
• Implement traits to control formatting

Learn More

• std::fmt documentation