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.