Rust 정수 타입 — i32 가 기본이고, 담을 수 있는 범위가 정해져 있다

fn main() {
    println!("i8:  {} ~ {}", i8::MIN, i8::MAX);
    println!("u8:  {} ~ {}", u8::MIN, u8::MAX);
    println!("i32: {} ~ {}", i32::MIN, i32::MAX);
    println!("u32: {} ~ {}", u32::MIN, u32::MAX);
}

   Compiling ints v0.1.0 (~/projects/ints)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
     Running `target/debug/ints`
i8:  -128 ~ 127
u8:  0 ~ 255
i32: -2147483648 ~ 2147483647
u32: 0 ~ 4294967295

fn main() {
    let age: u8 = 300;
    println!("{age}");
}

error: literal out of range for `u8`
 --> src/main.rs:2:19
  |
2 |     let age: u8 = 300;
  |                   ^^^
  |
  = note: the literal `300` does not fit into the type `u8` whose range is `0..=255`
  = note: `#[deny(overflowing_literals)]` on by default

fn main() {
    let level: u8 = 255;
    let next = level + 1;
    println!("{next}");
}

error: this arithmetic operation will overflow
 --> src/main.rs:3:16
  |
3 |     let next = level + 1;
  |                ^^^^^^^^^ attempt to compute `u8::MAX + 1_u8`, which would overflow
  |
  = note: `#[deny(arithmetic_overflow)]` on by default

fn main() {
    let total = 7;
    let people = 2;
    println!("{}", total / people);
    println!("{}", total % people);
}

   Compiling ints v0.1.0 (~/projects/ints)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
     Running `target/debug/ints`
3
1