Float Primitives

f32 และ f64 types

Basic Usage

fn main() {
    // Default is f64
    let x = 3.14;  // f64
    let y: f32 = 2.71;  // f32

    println!("f64: {}", x);
    println!("f32: {}", y);

    // With suffix
    let a = 1.0f32;
    let b = 1.0f64;

    // Scientific notation
    let big = 1.5e10;
    let small = 1.5e-10;
    println!("Big: {}, Small: {}", big, small);

    // Size
    println!("\n=== Size ===");
    println!("f32: {} bytes", std::mem::size_of::<f32>());
    println!("f64: {} bytes", std::mem::size_of::<f64>());

    // Precision
    println!("\n=== Precision ===");
    let pi_32: f32 = 3.14159265358979323846;
    let pi_64: f64 = 3.14159265358979323846;
    println!("f32 pi: {:.20}", pi_32);
    println!("f64 pi: {:.20}", pi_64);
}