Unsigned Integer Primitives

u8, u16, u32, u64, u128, usize

Basic Usage

fn main() {
    // Different sizes
    let u8_val: u8 = 255;
    let u16_val: u16 = 65535;
    let u32_val: u32 = 4_294_967_295;
    let u64_val: u64 = 18_446_744_073_709_551_615;
    let u128_val: u128 = 340_282_366_920_938_463_463_374_607_431_768_211_455;

    println!("u8: {}", u8_val);
    println!("u16: {}", u16_val);
    println!("u32: {}", u32_val);
    println!("u64: {}", u64_val);
    println!("u128: {}", u128_val);

    // usize depends on architecture
    let usize_val: usize = 42;
    println!("usize: {} ({}bit)", usize_val, std::mem::size_of::<usize>() * 8);

    // Literal suffixes
    let a = 42u8;
    let b = 1000u32;
    let c = 1_000_000usize;

    // Different bases
    let decimal = 255;
    let hex = 0xFF;
    let octal = 0o377;
    let binary = 0b11111111;

    println!("All 255: {}, {}, {}, {}", decimal, hex, octal, binary);

    // Byte literal
    let byte = b'A';  // u8
    println!("Byte: {} = '{}'", byte, byte as char);
}