Where communities thrive


  • Join over 1.5M+ people
  • Join over 100K+ communities
  • Free without limits
  • Create your own community
People
Activity
  • Jun 05 2016 10:31
    @alexvandesande banned @adamskee
  • Mar 16 2016 01:12
    @alexvandesande banned @scbosse
OneTop
@OneTop

pragma solidity ^0.4.16;

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }

contract TokenERC20 {
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals = 18;
// 18 decimals is the strongly suggested default, avoid changing it
uint256 public totalSupply;

// This creates an array with all balances
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;

// This generates a public event on the blockchain that will notify clients
event Transfer(address indexed from, address indexed to, uint256 value);

// This generates a public event on the blockchain that will notify clients
event Approval(address indexed _owner, address indexed _spender, uint256 _value);

// This notifies clients about the amount burnt
event Burn(address indexed from, uint256 value);

/**
 * Constructor function
 *
 * Initializes contract with initial supply tokens to the creator of the contract
 */
function TokenERC20(
    uint256 initialSupply,
    string tokenName,
    string tokenSymbol
) public {
    totalSupply = initialSupply * 10 ** uint256(decimals);  // Update total supply with the decimal amount
    balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
    name = tokenName;                                   // Set the name for display purposes
    symbol = tokenSymbol;                               // Set the symbol for display purposes
}

/**
 * Internal transfer, only can be called by this contract
 */
function _transfer(address _from, address _to, uint _value) internal {
    // Prevent transfer to 0x0 address. Use burn() instead
    require(_to != 0x0);
    // Check if the sender has enough
    require(balanceOf[_from] >= _value);
    // Check for overflows
    require(balanceOf[_to] + _value >= balanceOf[_to]);
    // Save this for an assertion in the future
    uint previousBalances = balanceOf[_from] + balanceOf[_to];
    // Subtract from the sender
    balanceOf[_from] -= _value;
    // Add the same to the recipient
    balanceOf[_to] += _value;
    emit Transfer(_from, _to, _value);
    // Asserts are used to use static analysis to find bugs in your code. They should never fail
    assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}

/**
 * Transfer tokens
 *
 * Send `_value` tokens to `_to` from your account
 *
 * @param _to The address of the recipient
 * @param _value the amount to send
 */
function transfer(address _to, uint256 _value) public returns (bool success) {
    _transfer(msg.sender, _to, _value);
    return true;
}

/**
 * Transfer tokens from other address
 *
 * Send `_value` tokens to `_to` on behalf of `_from`
 *
 * @param _from The address of the sender
 * @param _to The address of the recipient
 * @param _value the amount to send
 */
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
    require(_value <= allowance[_from][msg.sender]);     // Check allowance
    allowance[_from][msg.sender] -= _value;
    _transfer(_from, _to, _value);
    return true;
}

/**
 * Set allowance for other address
 *
 * Allows `_spender` to spend no more than `_value` tokens on your behalf
 *
 * @param _spender The address authorized to spend
 * @param _value the max amount they can spend
 */
function approve(address _spender, uint256 _value) public
    returns (bool success) {
    allowance[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
}

/**
 * Set allowance for other address and notify
 *
 * Allows `_spender` to spend no more than `_
what do i Need to change
Navneet Boghani
@navneetboghani
block count is not running for ETC in GETH
so can you tell me whats problem
how can i resolved it?
Singh
@Nitishkumar3211
Has anyone ever build Universal wallet?
coryallen34
@coryallen34
why does this have a hold on create me and wallet. and this is stopping a lot of my projects i believe
don't make a dime sure not donating nothing
Hubery2018
@Hubery2018
hello everyone;
what is the safest way to issu the contract?
supawich001
@supawich001
Hi
i have question for crate own coin use erc 20
supawich001
@supawich001
i'm send own coin to other wallet but use ether fee
how to send own coin by use own coin fee
ngocquy719
@ngocquy719
Hi, someone send me a completed code please? i always get error when i use code on ethereum.org
PRANJAL KUMAR
@pranjalkumar
Anyone , I need help with ethereum
Eth
@eth_eth87955763_twitter
Kindly contact eth@consultant.com for rectification
ThisIsCodeXpert
@ThisIsCodeXpert
Hi Guys, New tutorials for Solidity are available here : https://www.youtube.com/playlist?list=PLL5pYVd8AWtT6vcvLo6vHv3EmtsqiQBxy
davoud vakili
@motafa1320
HI
SmarterEric
@SmarterEric
hi
my name is ERIC from china, very glad to be here
I need some information or method about eth testing, please send to me. ths
sahni619
@sahni619
Hello all
I am unable to see constructer parameters as soon as a define a contract.. can anyone help. I am new to etherium
darr381
@darr381
i see so many questions who answers them?
godemacr
@godemacr

Hi There is a person to answer the question here

Is it?

rajeshchilukuri
@rajeshchilukuri
HI All can any one give me link to understand basic of bitcoin etc.. Jumping into technical gives me tough time to understand the concepts
davoud vakili
@motafa1320
@SmarterEric
very thanks
in this bout you can doing two work:
1) - or going to the metamask part to the test
davoud vakili
@motafa1320
2)- you can going to the ether wallet and going to the part test
YmilitaryM
@YmilitaryM
hello
is there anyone tole me about creating account implemented
Anubhav Gupta
@array-addu
I have a requirement where we need to save data(pdf) to blockchain so that any third party can access and view it later by the block address. I can't store the hash of the data on blockchain as the third party does not have access to the original document to verify the hash of the data. Is it feasible?
Deep Vora
@dv29
I'd say its not feasible, as storing data on blockchain is really expensive
also if you end up doing that, encrypt your file before storing on blockchain
mghase
@mghase

We can create ERC20 tokens using solidity or even metamask.. but how to create unique address to transfer them?

I mean token like Gold reward or coins like Bitconnect has it's own pattern of address to transfer in between. how to do that?

In HitBTC also for every token you will get unique address to send..

if is there any way to do this, need to do that during the contract deployment or can be done after creating the simple token ?

Akshay Dev H
@akshaydevh
Hi, i have used the functions from https://www.ethereum.org/token ,, it deploys perfectly, but returns an error "the constructor should be payable, if you send value" message while attempting to buy tokens using ether (in Java Script VM) . I have also made the constructor function payable.. still it returns error :(
akashashen
@akashashen
Where would be the best place to get help on deploying a token regarding myetherwallet? I've choked out something that I suspect was malformed and can't afford to make that mistake again.
Mahadream
@Mahadream
Hi all , how to get all the blocks transaction like as etherscan.api based on ethereum address , plz help me to solve
How can we get transaction details from ethereum address using web3 its getting slow any other solution that would get result fast.Like etherscan api??
nata711
@nata711
hi all, i am trying to create an account but for hours seeing generating account... any clue?
Melvin Olive
@molive14
Hello all I am trying to raise funds for my startup via etherium crowd sale.
in the amount of 2000000 USD
anuragLHT
@anuragLHT
Hello everyone,
can anyone please help to sort out my problem,
Actually i want to use one instance of my token contract in many other contract (different contracts for differnt type of people like advisors , developers).
If anyone knows , please help me
Myles MacGregor
@MPA-MRK
When I try to develop a new contract, why is the line "function MyToken(...)" wrong?
sahni619
@sahni619
How do we deal with this error : Defining constructors as functions with the same name as the contract is deprecated. Use "constructor(...) { ... }" instead.
I am new to ethereum and need some help with this
Ali
@AboShanab
Hey guys, how can I verify the contract on etherscan?