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pragma solidity ^0.4.10;
contract SafeMath {
function safeAdd(uint256 x, uint256 y) internal returns(uint256) {
uint256 z = x + y;
assert((z >= x) && (z >= y));
return z;
}
function safeSubtract(uint256 x, uint256 y) internal returns(uint256) {
assert(x >= y);
uint256 z = x - y;
return z;
}
function safeMult(uint256 x, uint256 y) internal returns(uint256) {
uint256 z = x * y;
assert((x == 0)||(z/x == y));
return z;
}
}
contract Token {
uint256 public totalSupply;
function balanceOf(address _owner) constant returns (uint256 balance);
function transfer(address _to, uint256 _value) returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
function approve(address _spender, uint256 _value) returns (bool success);
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 , SafeMath {
bool public status = true;
modifier on() {
require(status == true);
_;
}
function transfer(address _to, uint256 _value) on returns (bool success) {
if (balances[msg.sender] >= _value && _value > 0 && _to != 0X0) {
balances[msg.sender] -= _value;
balances[_to] = safeAdd(balances[_to],_value);
Transfer(msg.sender, _to, _value);
return true;
} else {
return false;
}
}
function transferFrom(address _from, address _to, uint256 _value) on returns (bool success) {
if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
balances[_to] = safeAdd(balances[_to],_value);
balances[_from] = safeSubtract(balances[_from],_value);
allowed[_from][msg.sender] = safeSubtract(allowed[_from][msg.sender],_value);
Transfer(_from, _to, _value);
return true;
} else {
return false;
}
}
function balanceOf(address _owner) on constant returns (uint256 balance) {
return balances[_owner];
}
function approve(address _spender, uint256 _value) on returns (bool success) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) on constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
}
contract ExShellToken is StandardToken {
string public name = "ExShellToken";
uint8 public decimals = 8;
string public symbol = "ET";
bool private init =true;
function turnon() controller {
status = true;
}
function turnoff() controller {
status = false;
}
function ExShellToken() {
require(init==true);
totalSupply = 2000000000;
balances[0xa089a405b1df71a6155705fb2bce87df2a86a9e4] = totalSupply;
init = false;
}
address public controller1 =0xa089a405b1df71a6155705fb2bce87df2a86a9e4;
address public controller2 =0x5aa64423529e43a53c7ea037a07f94abc0c3a111;
modifier controller () {
require(msg.sender == controller1||msg.sender == controller2);
_;
}
} |