Rust for Python Developers - Unsigned, Signed Integers and Casting

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Signed Integer Types

The default integer type in Rust is i32. Signed integer types in Rust start with i and it has 8, 16, 32, 64, and 128-bit.

The minimum and maximum values are from -(2ⁿ⁻¹) to 2ⁿ⁻¹-1. The -1 in the n-1 is the sign bit (positive or negative), which we cover in the next section.

For example i8 has -(2⁷) to 2⁷-1, which is -128 to 127. The following table shows all the details for signed integers.

DATA TYPE	MIN	MAX	Length
i8	-128	127	8-bit
i16	-32768	32767	16-bit
i32	-2147483648	2147483647	32-bit
i64	-92233720368547...	92233720368547...	64-bit
i128	-17014118346046923173168...	17014118346046923173168...	128-bit

fn main() {
    println!(" i8 has the min value of {}.", i8::min_value());
    println!(" i8 has the max value of {}.", i8::max_value());
    println!(" i16 has the min value of {}.", i16::min_value());
    println!(" i16 has the max value of {}.", i16::max_value());
    println!(" i32 has the min value of {}.", i32::min_value());
    println!(" i32 has the max value of {}.", i32::max_value());
    println!(" i64 has the min value of {}.", i64::min_value());
    println!(" i64 has the max value of {}.", i64::max_value());
    println!(" i128 has the min value of {}.", i128::min_value());
    println!(" i128 has the max value of {}.", i128::max_value());
}

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