Solidity – Hashes and Typecasting
11 Dec 2017Hashes
In Solidity, it is possible to use the keccak256 function to get a hash. Ethereum’s KECCAK-256 algorithm produces a 256-bit hexadecimal number.
keccak256(…) returns (bytes32): compute the Ethereum-SHA-3 (Keccak-256) hash of the (tightly packed) arguments
Usage Examples
keccak256(6382179)
keccak256(97, 98, 99)
Typecasting
Solidity is a statically typed language, which means that the type of each variable (state and local) needs to be specified at compile-time. Solidity is able to perform operations between two variables that have the same type. Therefore you can convert one of the variables to the type of the others.
uint256 z = y * uint256(x);
uint8 x = 8;
uint256 y = 10 ** 18;