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Created using browser-solidity: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://ethereum.github.io/browser-solidity/#version=soljson-v0.4.18+commit.9cf6e910.js&optimize=undefined&gist=
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contract creatorBalanceChecker { | |
address creator; | |
uint creatorbalance; // TIP: uint is an alias for uint256. Ditto int and int256. | |
function creatorBalanceChecker() public | |
{ | |
creator = msg.sender; // msg is a global variable | |
creatorbalance = creator.balance; | |
} | |
function getContractAddress() constant returns (address) | |
{ | |
return this; | |
} | |
function getCreatorBalance() constant returns (uint) // Will return the creator's balance AT THE TIME THIS CONTRACT WAS CREATED | |
{ | |
return creatorbalance; | |
} | |
function getCreatorDotBalance() constant returns (uint) // Will return creator's balance NOW | |
{ | |
return creator.balance; | |
} | |
/********** | |
Standard kill() function to recover funds | |
**********/ | |
function kill() | |
{ | |
if (msg.sender == creator) | |
suicide(creator); // kills this contract and sends remaining funds back to creator | |
} | |
} |
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pragma solidity ^0.4.0; | |
contract Ballot { | |
struct Voter { | |
uint weight; | |
bool voted; | |
uint8 vote; | |
address delegate; | |
} | |
struct Proposal { | |
uint voteCount; | |
} | |
address chairperson; | |
mapping(address => Voter) voters; | |
Proposal[] proposals; | |
/// Create a new ballot with $(_numProposals) different proposals. | |
function Ballot(uint8 _numProposals) { | |
chairperson = msg.sender; | |
voters[chairperson].weight = 1; | |
proposals.length = _numProposals; | |
} | |
/// Give $(voter) the right to vote on this ballot. | |
/// May only be called by $(chairperson). | |
function giveRightToVote(address voter) { | |
if (msg.sender != chairperson || voters[voter].voted) return; | |
voters[voter].weight = 1; | |
} | |
/// Delegate your vote to the voter $(to). | |
function delegate(address to) { | |
Voter storage sender = voters[msg.sender]; // assigns reference | |
if (sender.voted) return; | |
while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender) | |
to = voters[to].delegate; | |
if (to == msg.sender) return; | |
sender.voted = true; | |
sender.delegate = to; | |
Voter storage delegateTo = voters[to]; | |
if (delegateTo.voted) | |
proposals[delegateTo.vote].voteCount += sender.weight; | |
else | |
delegateTo.weight += sender.weight; | |
} | |
/// Give a single vote to proposal $(proposal). | |
function vote(uint8 proposal) { | |
Voter storage sender = voters[msg.sender]; | |
if (sender.voted || proposal >= proposals.length) return; | |
sender.voted = true; | |
sender.vote = proposal; | |
proposals[proposal].voteCount += sender.weight; | |
} | |
function winningProposal() constant returns (uint8 _winningProposal) { | |
uint256 winningVoteCount = 0; | |
for (uint8 proposal = 0; proposal < proposals.length; proposal++) | |
if (proposals[proposal].voteCount > winningVoteCount) { | |
winningVoteCount = proposals[proposal].voteCount; | |
_winningProposal = proposal; | |
} | |
} | |
} |
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contract Greeter // The contract definition. A constructor of the same name will be automatically called on contract creation. | |
{ | |
address creator; // At first, an empty "address"-type variable of the name "creator". Will be set in the constructor. | |
string greeting; // At first, an empty "string"-type variable of the name "greeting". Will be set in constructor and can be changed. | |
function Greeter(string _greeting) public // The constructor. It accepts a string input and saves it to the contract's "greeting" variable. | |
{ | |
creator = msg.sender; | |
greeting = _greeting; | |
} | |
function greet() constant returns (string) | |
{ | |
return greeting; | |
} | |
function getBlockNumber() constant returns (uint) // this doesn't have anything to do with the act of greeting | |
{ // just demonstrating return of some global variable | |
return block.number; | |
} | |
function setGreeting(string _newgreeting) | |
{ | |
greeting = _newgreeting; | |
} | |
/********** | |
Standard kill() function to recover funds | |
**********/ | |
function kill() | |
{ | |
if (msg.sender == creator) // only allow this action if the account sending the signal is the creator | |
suicide(creator); // kills this contract and sends remaining funds back to creator | |
} | |
} |
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contract infoGetter { | |
address creator; | |
function basicInfoGetter() public { | |
creator = msg.sender; | |
} | |
function getCurrentMinerAddress() constant returns (address){ | |
// get CURRENT block miner's address, | |
// not necessarily the address of the miner when this block was born | |
return block.coinbase; | |
} | |
function getCurrentDifficulty() constant returns (uint){ | |
return block.difficulty; | |
} | |
function getCurrentGaslimit() constant returns (uint){ | |
// the most gas that can be spent on any given transaction right now | |
return block.gaslimit; | |
} | |
function getCurrentBlockNumber() constant returns (uint){ | |
return block.number; | |
} | |
function getBlockTimestamp() constant returns (uint){ | |
// returns current block timestamp in SECONDS (not ms) from epoch | |
// also "now" == "block.timestamp", as in "return now;" | |
return block.timestamp; | |
} | |
function getMsgData() constant returns (bytes){ | |
// The data of a call to this function. Always returns "0xc8e7ca2e" for me. | |
// adding an input parameter would probably change it with each diff call? | |
return msg.data; | |
} | |
function getMsgSender() constant returns (address){ | |
// Returns the address of whomever made this call | |
// (i.e. not necessarily the creator of the contract) | |
return msg.sender; | |
} | |
function getTxGasprice() constant returns (uint){ | |
// "gasprice" is the amount of gas the sender was *willing* to pay. 50000000 for me. (geth default) | |
return tx.gasprice; | |
} | |
function getTxOrigin() constant returns (address){ | |
// returns sender of the transaction | |
// What if there is a chain of calls? I think it returns the first sender, whoever provided the gas. | |
return tx.origin; | |
} | |
function getContractAddress() constant returns (address) { | |
return this; | |
} | |
function getContractBalance() constant returns (uint) { | |
return this.balance; | |
} | |
/********** | |
Standard kill() function to recover funds | |
**********/ | |
function kill(){ | |
if (msg.sender == creator){ | |
// kills this contract and sends remaining funds back to creator | |
suicide(creator); | |
} | |
} | |
} |
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contract BasicIterator { | |
address creator; // reserve one "address"-type spot | |
uint8[10] integers; // reserve a chunk of storage for 10 8-bit unsigned integers in an array | |
function BasicIterator() | |
{ | |
creator = msg.sender; // set the creator address | |
uint8 x = 0; // initialize an 8-bit, unsigned integer to zero | |
while(x < integers.length) // the variable integers was initialized to length 10 | |
{ | |
integers[x] = x; // set integers to [0,1,2,3,4,5,6,7,8,9] over ten iterations | |
x++; | |
} | |
} | |
function getSum() constant returns (uint) // "constant" just means this function returns something to the caller | |
{ // which is immediately followed by what type gets returned, in this case a full uint256 | |
uint8 sum = 0; | |
uint8 x = 0; | |
while(x < integers.length) | |
{ | |
sum = sum + integers[x]; | |
x++; | |
} | |
return sum; | |
} | |
/********** | |
Standard kill() function to recover funds | |
**********/ | |
function kill() | |
{ | |
if (msg.sender == creator) | |
{ | |
suicide(creator); // kills this contract and sends remaining funds back to creator | |
} | |
} | |
} |
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/* | |
Oraclize random-datasource example | |
This contract uses the random-datasource to securely generate off-chain N random bytes | |
*/ | |
pragma solidity ^0.4.11; | |
import "github.com/oraclize/ethereum-api/oraclizeAPI.sol"; | |
contract RandomExample is usingOraclize { | |
event newRandomNumber_bytes(bytes); | |
event newRandomNumber_uint(uint); | |
function RandomExample() { | |
oraclize_setProof(proofType_Ledger); // sets the Ledger authenticity proof in the constructor | |
update(); // let's ask for N random bytes immediately when the contract is created! | |
} | |
// the callback function is called by Oraclize when the result is ready | |
// the oraclize_randomDS_proofVerify modifier prevents an invalid proof to execute this function code: | |
// the proof validity is fully verified on-chain | |
function __callback(bytes32 _queryId, string _result, bytes _proof) | |
{ | |
// if we reach this point successfully, it means that the attached authenticity proof has passed! | |
if (msg.sender != oraclize_cbAddress()) throw; | |
if (oraclize_randomDS_proofVerify__returnCode(_queryId, _result, _proof) != 0) { | |
// the proof verification has failed, do we need to take any action here? (depends on the use case) | |
} else { | |
// the proof verification has passed | |
// now that we know that the random number was safely generated, let's use it.. | |
newRandomNumber_bytes(bytes(_result)); // this is the resulting random number (bytes) | |
// for simplicity of use, let's also convert the random bytes to uint if we need | |
uint maxRange = 2**(8* 7); // this is the highest uint we want to get. It should never be greater than 2^(8*N), where N is the number of random bytes we had asked the datasource to return | |
uint randomNumber = uint(sha3(_result)) % maxRange; // this is an efficient way to get the uint out in the [0, maxRange] range | |
newRandomNumber_uint(randomNumber); // this is the resulting random number (uint) | |
} | |
} | |
function update() payable { | |
uint N = 7; // number of random bytes we want the datasource to return | |
uint delay = 0; // number of seconds to wait before the execution takes place | |
uint callbackGas = 200000; // amount of gas we want Oraclize to set for the callback function | |
bytes32 queryId = oraclize_newRandomDSQuery(delay, N, callbackGas); // this function internally generates the correct oraclize_query and returns its queryId | |
} | |
} |
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