Ethereum Cookbook

How to do it...

1. Inherit contracts using the is keyword. The parent contract has to be imported or copied to the same file before inheriting:

contract A {    ...}contract B is A {    ...}

2. When a contract inherits from multiple contracts, only a single contract is created in the blockchain. The other code from all the base contracts is copied into the created contract.
3. In inheritance, the final function will be invoked while calling it by name. Call the functions in the parent contract by explicitly specifying their names:

pragma solidity ^0.4.23;contract A {    uint public value;    function changeValue() public {         value = 1;     }}contract B is A {    function changeValue() public {         value = 2;     }}

4. Access the functions from the base contract using the ...