Integer Primitives

i8, i16, i32, i64, i128, isize types

Basic Usage

fn main() {
    // Different sizes
    let i8_val: i8 = 127;
    let i16_val: i16 = 32_767;
    let i32_val: i32 = 2_147_483_647;
    let i64_val: i64 = 9_223_372_036_854_775_807;
    let i128_val: i128 = 170_141_183_460_469_231_731_687_303_715_884_105_727;

    println!("i8: {}", i8_val);
    println!("i16: {}", i16_val);
    println!("i32: {}", i32_val);
    println!("i64: {}", i64_val);
    println!("i128: {}", i128_val);

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

    // Negative values
    let neg: i32 = -42;
    println!("Negative: {}", neg);

    // Literal suffixes
    let a = 42i8;
    let b = -100i32;
    let c = 1_000_000isize;

    println!("Suffixed: {} {} {}", a, b, c);

    // Default is i32
    let default = 42;  // i32
    println!("Default type: {}", std::any::type_name_of_val(&default));
}