The structure of a smart contract

A is akin to a class. It can functions, modifiers, state variables, events, structures, and enums. Contracts also support inheritance. You can implement inheritance by copying code during compiling. Smart contracts can also be polymorphic.

The following an example of a smart contract:

contract Sample
{
     //state variables 
     uint256 data;
     address owner;

     //event definition
     event logData(uint256 dataToLog);

     //function modifier
     modifier onlyOwner() {
         if (msg.sender != owner) throw;
         _; 
    }

     //constructor
     function Sample(uint256 initData, address initOwner){
         data = initData;
         owner = initOwner;
     }

     //functions
     function getData() returns (uint256 returnedData){
         return data;
     }
     function setData(uint256 newData) onlyOwner{
         logData(newData);
         data = newData;
     }
}

Let's see how the aforementioned code works:

• First, we used the contract...