Rust for Python Developers - Unsigned, Signed Integers and Casting

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Unsigned Integer Types

Unsigned integer types in Rust start with u and it has 8, 16, 32, 64, and 128-bit. The minimum and maximum values are from 0 to 2ⁿ-1.

For example u8 has 0 to 2⁸-1, which is 255. The following table shows all the details for unsigned integers.

DATA TYPE	MAX	Length
u8	255	8-bit
u16	65535	16-bit
u32	4294967295	32-bit
u64	18446744073709551615	64-bit
u128	340282366920938463463374607431768211455	128-bit

If you try to assign a negative number to an unsigned type, it will fail.

fn main() {
    let u:u32 = -1;
    println!("{} in binary is {:b}", u, u);
}
// error[E0600]: cannot apply unary operator `-` to type `u32`
//  --> main.rs" data-line="2" data-column="17">main.rs:2:17
//   |
// 2 |     let u:u32 = -1;
//   |                 ^^ cannot apply unary operator `-`
//   |
//   = note: unsigned values cannot be negated

- is one of Rust's unary operators and it is the negation operator for signed integer types and floating-point types.

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Unsigned Integer Types

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