Rust Arithmetic & Type Casting

Different datatypes cannot be added together

let x: i8 = 12;
let y: u8 = 10;
let z = x + y; // this will give an error

We cannot add same class different precision values for example i32 + i64 would give an error.
The result is same type as that of the operands. If the operands are i8 then the result will also be i8 unless explicitly type casted.

Multiple ways of defining the type of operand

let a: i8 = 12;
let x = 12_i8;
let y = 12 as i8;
let z = 12i8;

as is how we do explicit type conversion

let x: i8 = 45;
let y: i32 = 566;
let z = (x as i32) + y;

In the above example we are going from a smaller to a larger type, if you go to a smaller type from a larger type then an overflow will occur.

Last updated: 2022-05-20