solidityPseudo random number generation
uint8 number = uint8(uint256(keccak256(abi.encodePacked(block.timestamp, block.difficulty)))%251);ctrl + cuint8(converts everything to uint8 | uint256(needs to be converted for bytes32 and int_const to interact |
keccak256(abi.encodePacked(block.timestamp, block.difficulty)))takes the block hash and difficulty, ABI encodes it, and hashes it with keccak256 | %251);defines the max number. In this case its 250 |
Usage example
pragma solidity >=0.7.0 <0.9.0;
contract randomNumber {
uint8 public number;
function store() public {
number = uint8(uint256(keccak256(abi.encodePacked(block.timestamp, block.difficulty)))%251);
}
}