創建了一個代幣，供應量低於我的需要

我只想創造 700 億的供應，但我有 7000 萬。程式碼

pragma solidity ^0.4.4;

contract Token {

   /// @return total amount of tokens
   function totalSupply() constant returns (uint256 supply) {}

   /// @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 `_addr` to spend `_value` tokens
   /// @param _spender The address of the account able to transfer the tokens
   /// @param _value The amount of wei 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);

}

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.
       //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
       if (balances[msg.sender] >= _value && _value > 0) {
           balances[msg.sender] -= _value;
           balances[_to] += _value;
           Transfer(msg.sender, _to, _value);
           return true;
       } else { return false; }
   }

   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.
       //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
       if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
           balances[_to] += _value;
           balances[_from] -= _value;
           allowed[_from][msg.sender] -= _value;
           Transfer(_from, _to, _value);
           return true;
       } else { return false; }
   }

   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;
   uint256 public totalSupply;
}

contract BitcoinCrown is StandardToken { 

   /* Public variables of the token */

   /*
   NOTE:
   The following variables are OPTIONAL vanities. One does not have to include them.
   They allow one to customise the token contract & in no way influences the core functionality.
   Some wallets/interfaces might not even bother to look at this information.
   */
   string public name;                   // Token Name
   uint8 public decimals;                // How many decimals to show. To be standard complicant keep it 18
   string public symbol;                 // An identifier: eg SBX, XPR etc..
   string public version = 'H1.0'; 
   uint256 public unitsOneEthCanBuy;     // How many units of your coin can be bought by 1 ETH?
   uint256 public totalEthInWei;         // WEI is the smallest unit of ETH (the equivalent of cent in USD or satoshi in BTC). We'll store the total ETH raised via our ICO here.  
   address public fundsWallet;           // Where should the raised ETH go?

   // This is a constructor function 
   // which means the following function name has to match the contract name declared above
   function BitcoinCrown() {
       balances[msg.sender] = 70000000000000000000000000;               // Give the creator all initial tokens.
       totalSupply = 70000000000000000000000000;                       // Update total supply 
       name = "BitcoinCrown";                                         // Set the name for display purposes 
       decimals = 18;                                                // Amount of decimals for display purposes
       symbol = "BTCC";                                             // Set the symbol for display purposes 
       unitsOneEthCanBuy = 2800;                                   // Set the price of your token for the ICO 
       fundsWallet = msg.sender;                                  // The owner of the contract gets ETH
   }

   function() payable{
       totalEthInWei = totalEthInWei + msg.value;
       uint256 amount = msg.value * unitsOneEthCanBuy;
       require(balances[fundsWallet] >= amount);

       balances[fundsWallet] = balances[fundsWallet] - amount;
       balances[msg.sender] = balances[msg.sender] + amount;

       Transfer(fundsWallet, msg.sender, amount); // Broadcast a message to the blockchain

       //Transfer ether to fundsWallet
       fundsWallet.transfer(msg.value);                               
   }

   /* Approves and then calls the receiving contract */
   function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
       allowed[msg.sender][_spender] = _value;
       Approval(msg.sender, _spender, _value);

       //call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
       //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
       //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
       if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
       return true;
   }
}

查看您的建構子：

function BitcoinCrown() {
   balances[msg.sender] = 70000000000000000000000000;               // Give the creator all initial tokens.
   totalSupply = 70000000000000000000000000;                       // Update total supply 
   name = "BitcoinCrown";                                         // Set the name for display purposes 
   decimals = 18;                                                // Amount of decimals for display purposes
   symbol = "BTCC";                                             // Set the symbol for display purposes 
   unitsOneEthCanBuy = 2800;                                   // Set the price of your token for the ICO 
   fundsWallet = msg.sender;                                  // The owner of the contract gets ETH
}

你設置totalSupply為70000000000000000000000000 = 7 x 10^25

您設置decimals為18這意味著完整單位令牌的總數為：

7 x 10^(25 - 18) = 7 x 10^7 = 70,000,000

所以你只需要在你的 中添加三個零totalSupply，或者減少decimals值，但是這18是標準的，所以你可能不應該碰它。

你有相同的小數位數wei，eth所以你可以使用這個單位轉換器。當您插入時70000000000000000000000000 wei，這實際上意味著70000000 eth或70000000 BTCC在您的情況下。

替換70000000000000000000000000為70000000000000000000000000000，你就可以開始了。

引用自：https://ethereum.stackexchange.com/questions/56062