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Blochain_crytocurrrency_confrerence_2017 Training
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pragma solidity ^0.4.0; | |
contract Coin { | |
// The keyword "public" makes those variables | |
// readable from outside. | |
address public minter; | |
mapping (address => uint) public balances; | |
// Events allow light clients to react on | |
// changes efficiently. | |
event Sent(address from, address to, uint amount); | |
// This is the constructor whose code is | |
// run only when the contract is created. | |
function Coin() { | |
minter = msg.sender; | |
} | |
function mint(address receiver, uint amount) { | |
if (msg.sender != minter) return; | |
balances[receiver] += amount; | |
} | |
function send(address receiver, uint amount) { | |
if (balances[msg.sender] < amount) return; | |
balances[msg.sender] -= amount; | |
balances[receiver] += amount; | |
Sent(msg.sender, receiver, amount); | |
} | |
} |
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pragma solidity^0.4.11; | |
contract Hello{ | |
event say_hello(string); | |
function Hello(){} | |
function world() constant returns(string){ | |
return "world"; | |
} | |
function greet(string name){ | |
say_hello(name); | |
} | |
function(){ | |
throw; | |
} | |
} |
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pragma solidity ^0.4.10; | |
contract Helloworld{ | |
function Helloworld(){ | |
count = 0; | |
} | |
uint public count; | |
struct Person { | |
address add; | |
string name; | |
string position; | |
string sex; | |
string hobby; | |
} | |
Person[] public People; | |
function getWorld() constant returns(string hello){ | |
hello = "Hello SuperDAO"; | |
} | |
function greetTrainees() constant returns (string){ | |
string memory hey = "Welcome Trainees :)"; | |
return hey; | |
} | |
function getStarted() constant returns (string){ | |
return "Let's get this show on the ROAD"; | |
} | |
function setTrainee (address addr, string nme, string position, string sex, string hobby) returns(bool){ | |
People.length = count+1; | |
People[count].add = addr; | |
People[count].name = nme; | |
People[count].position = position; | |
People[count].sex = sex; | |
People[count].hobby = hobby; | |
count++; | |
return true; | |
} | |
function getTrainee(uint pos) constant returns (address,string,string,string,string){ | |
return( | |
People[pos].add, | |
People[pos].name, | |
People[pos].position, | |
People[pos].sex, | |
People[pos].hobby | |
); | |
} | |
function (){ | |
throw; | |
} | |
} |
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/* | |
You should inherit from StandardToken or, for a token like you would want to | |
deploy in something like Mist, see HumanStandardToken.sol. | |
(This implements ONLY the standard functions and NOTHING else. | |
If you deploy this, you won't have anything useful.) | |
Implements ERC 20 Token standard: https://github.com/ethereum/EIPs/issues/20 | |
.*/ | |
pragma solidity ^0.4.8; | |
import "./Token.sol"; | |
contract StandardToken is Token { | |
function transfer(address _to, uint256 _value) returns (bool success) { | |
//Default assumes totalSupply can't be over max (2^256 - 1). | |
//If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap. | |
//Replace the if with this one instead. | |
//require(balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]); | |
require(balances[msg.sender] >= _value); | |
balances[msg.sender] -= _value; | |
balances[_to] += _value; | |
Transfer(msg.sender, _to, _value); | |
return true; | |
} | |
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { | |
//same as above. Replace this line with the following if you want to protect against wrapping uints. | |
//require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]); | |
require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value); | |
balances[_to] += _value; | |
balances[_from] -= _value; | |
allowed[_from][msg.sender] -= _value; | |
Transfer(_from, _to, _value); | |
return true; | |
} | |
function balanceOf(address _owner) constant returns (uint256 balance) { | |
return balances[_owner]; | |
} | |
function approve(address _spender, uint256 _value) returns (bool success) { | |
allowed[msg.sender][_spender] = _value; | |
Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
function allowance(address _owner, address _spender) constant returns (uint256 remaining) { | |
return allowed[_owner][_spender]; | |
} | |
mapping (address => uint256) balances; | |
mapping (address => mapping (address => uint256)) allowed; | |
} |
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// Abstract contract for the full ERC 20 Token standard | |
// https://github.com/ethereum/EIPs/issues/20 | |
pragma solidity ^0.4.8; | |
contract Token { | |
/* This is a slight change to the ERC20 base standard. | |
function totalSupply() constant returns (uint256 supply); | |
is replaced with: | |
uint256 public totalSupply; | |
This automatically creates a getter function for the totalSupply. | |
This is moved to the base contract since public getter functions are not | |
currently recognised as an implementation of the matching abstract | |
function by the compiler. | |
*/ | |
/// total amount of tokens | |
uint256 public totalSupply; | |
/// @param _owner The address from which the balance will be retrieved | |
/// @return The balance | |
function balanceOf(address _owner) constant returns (uint256 balance); | |
/// @notice send `_value` token to `_to` from `msg.sender` | |
/// @param _to The address of the recipient | |
/// @param _value The amount of token to be transferred | |
/// @return Whether the transfer was successful or not | |
function transfer(address _to, uint256 _value) returns (bool success); | |
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from` | |
/// @param _from The address of the sender | |
/// @param _to The address of the recipient | |
/// @param _value The amount of token to be transferred | |
/// @return Whether the transfer was successful or not | |
function transferFrom(address _from, address _to, uint256 _value) returns (bool success); | |
/// @notice `msg.sender` approves `_spender` to spend `_value` tokens | |
/// @param _spender The address of the account able to transfer the tokens | |
/// @param _value The amount of tokens to be approved for transfer | |
/// @return Whether the approval was successful or not | |
function approve(address _spender, uint256 _value) returns (bool success); | |
/// @param _owner The address of the account owning tokens | |
/// @param _spender The address of the account able to transfer the tokens | |
/// @return Amount of remaining tokens allowed to spent | |
function allowance(address _owner, address _spender) constant returns (uint256 remaining); | |
event Transfer(address indexed _from, address indexed _to, uint256 _value); | |
event Approval(address indexed _owner, address indexed _spender, uint256 _value); | |
} |
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Remix (Browser-solidity):
https://remix.ethereum.org