Address global variables

Every address, externally owned or contract-based, has five global functions and three global properties. These functions and properties will be explored in depth in subsequent chapters on Solidify functions. The global properties related to the address are balance, code, and codehash. The balance property is a getter property and helps in retrieving the current ether balance (in wei denomination) held by an address. Both code and codehash provide the bytecode responsible for contract creation in a different format.

The functions are as follows:

• <address>.transfer(uint256 amount): This function sends the given amount of wei to address and throws an exception in the event of failure.
• <address>.send(uint256 amount) returns (bool): This function sends the given amount of wei to address and returns false in the event of failure.

<address>.call(...) returns (bool): This function issues a low-level call and returns a tuple...