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myFirstContract.sol

pragma solidity ^0.4.0;
//Interface
interface Regulator{
    //Methods to implement
    function checkValue(uint amount) returns(bool);
    function loan() returns(bool);
}

//Extension of Rregulator interface
contract Bank is Regulator{
    //Datatype before access
    //<type> <access> <name>
    uint private value;
    //Address on the blockchain
    address private owner;
    
    //Access modifier
    //requiring that the owner of the contract
    //is the initial sender
    modifier ownerFunc{
        require(owner == msg.sender);
        _;
    }
    
    //Constructor
    function Bank(uint amount){
        value = amount;
        owner = msg.sender;
    }
    
    //Applying the access modifier to this function means
    //that performing the function must satisfy the modifier.
    //If the account address is changed after the initial send then 
    //deposits and withdrawals cannot be made because the modifier
    //will fail (see ownerFunc).
    function deposit(uint amount) ownerFunc{
        value += amount;
    }
    
    function withdraw(uint amount) ownerFunc{
        if (checkValue(amount)){
            value -= amount;
        }
    }
    
    //define return types within definition
    function balance() returns(uint){
        return value;
    }
    
    function checkValue(uint amount) returns(bool){
        return amount <= value;
    }
    
    function loan() returns(bool){
        return value > 0;
    }
}

//extension with constructor parameter injection 
contract MyFirstContract is Bank(10){
    string private name;
    uint private age;
    
    function getName() returns(string){
        return name;
    }
    
    function setName(string newName){
        name = newName;
    }
    
    function getAge() returns(uint){
        return age;
    }
    
    function setAge(uint newAge){
        age = newAge;
    }
}