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 TYPEMINMAXLength
i8-1281278-bit
i16-327683276716-bit
i32-2147483648214748364732-bit
i64-92233720368547...92233720368547...64-bit
i128-17014118346046923173168...17014118346046923173168...128-bit
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