contract smctoken is StandardToken { 

    /* Public variables of the token */
    string public name;                   
    uint8 public decimals;               
    string public symbol;               //token
    string public version = 'v2.1';    


    function smctoken() {
        balances[msg.sender] = 100000000000000000000000000; // 初始token数量给予消息发送者
        totalSupply = 100000000000000000000000000;         // 设置初始总量
        name = "YSBTOKEN";                   // token名称
        decimals = 18;           // 小数位数
        symbol = "YSB";             // token简称
    }

    /* 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.
        require(_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData));
        return true;
    }

}
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.
        require(_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData));
        return true;
    }
/* Approves and then calls the receiving contract */