The default type for variables in Yul is u256
. If there is no type specified, the compiler will default to that integer type. Variables can have a type specified during their declaration using the following syntax:
{
let a : u32, b : s64, d : u128, e : bool := multipleReturns()
}
Yul allows signed and unsigned integer types, in addition to the boolean type. If a conversion from an integer to a boolean is necessary, the compiler does the following operation number != 0
.
The unsigned types are the following: u8
, u32
, u64
, u128
and u256
.
The signed types are the following: s8
, s32
, s64
, s128
, s256
.