Contract Source Code:
File 1 of 1 : SGCC
pragma solidity ^0.4.8;
/* Math operations with safety checks */
contract SafeMath {
function safeMul(uint256 a, uint256 b) internal returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function safeDiv(uint256 a, uint256 b) internal returns (uint256) {
assert(b > 0);
uint256 c = a / b;
assert(a == b * c + a % b);
return c;
}
function safeSub(uint256 a, uint256 b) internal returns (uint256) {
assert(b <= a);
return a - b;
}
function safeAdd(uint256 a, uint256 b) internal returns (uint256) {
uint256 c = a + b;
assert(c>=a && c>=b);
return c;
}
function assert(bool assertion) internal {
if (!assertion) {
throw;
}
}
}
/* SGCC ERC20 Token */
contract SGCC is SafeMath {
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
address public owner;
/* This creates an array with all balances */
mapping (address => uint256) public balanceOf;
mapping (address => uint256) public freezeOf;
mapping (address => mapping (address => uint256)) public allowance;
/* This generates a public event for notifying clients of transfers */
event Transfer(address indexed from, address indexed to, uint256 value);
/* This notifies clients about the amount burnt */
event Burn(address indexed from, uint256 value);
/* This notifies clients about the amount frozen */
event Freeze(address indexed from, uint256 value);
/* This notifies clients about the amount unfrozen */
event Unfreeze(address indexed from, uint256 value);
/* Initializes contract with initial supply of tokens to the creator of the contract */
function SGCC() public {
decimals = 18;
balanceOf[msg.sender] = 20000000000 * (10 ** uint256(decimals)); // Give the creator all initial tokens
totalSupply = 20000000000 * (10 ** uint256(decimals)); // Update total supply
name = 'SGCC'; // Set the name for display purposes
symbol = 'SGCC'; // Set the symbol for display purposes
owner = msg.sender;
}
/* Send coins from the caller's account */
function transfer(address _to, uint256 _value) public {
if (_to == 0x0) throw; // Prevent transfer to 0x0 address. Use burn() instead
if (_value <= 0) throw;
if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
Transfer(msg.sender, _to, _value); // Notify anyone listening that this transfer took place
}
/* Allow another account to withdraw up to some number of coins from the caller */
function approve(address _spender, uint256 _value) public returns (bool success) {
if (_value <= 0) throw;
allowance[msg.sender][_spender] = _value;
return true;
}
/* Send coins from an account that previously approved this caller to do so */
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
if (_to == 0x0) throw; // Prevent transfer to 0x0 address. Use burn() instead
if (_value <= 0) throw;
if (balanceOf[_from] < _value) throw; // Check if the sender has enough
if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
if (_value > allowance[_from][msg.sender]) throw; // Check allowance
balanceOf[_from] = SafeMath.safeSub(balanceOf[_from], _value); // Subtract from the sender
balanceOf[_to] = SafeMath.safeAdd(balanceOf[_to], _value); // Add the same to the recipient
allowance[_from][msg.sender] = SafeMath.safeSub(allowance[_from][msg.sender], _value);
Transfer(_from, _to, _value); // emit event
return true;
}
/* Permanently delete some number of coins that are in the caller's account */
function burn(uint256 _value) public returns (bool success) {
if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough
if (_value <= 0) throw;
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
totalSupply = SafeMath.safeSub(totalSupply,_value); // Reduce the total supply too
Burn(msg.sender, _value); // emit event
return true;
}
/* Make some of the caller's coins temporarily unavailable */
function freeze(uint256 _value) public returns (bool success) {
if (balanceOf[msg.sender] < _value) throw; // Check if the sender has enough
if (_value <= 0) throw;
balanceOf[msg.sender] = SafeMath.safeSub(balanceOf[msg.sender], _value); // Subtract from the sender
freezeOf[msg.sender] = SafeMath.safeAdd(freezeOf[msg.sender], _value); // Add to sender's frozen balance
Freeze(msg.sender, _value); // emit event
return true;
}
/* Frozen coins can be made available again by unfreezing them */
function unfreeze(uint256 _value) public returns (bool success) {
if (freezeOf[msg.sender] < _value) throw; // Check if the sender has enough
if (_value <= 0) throw;
freezeOf[msg.sender] = SafeMath.safeSub(freezeOf[msg.sender], _value); // Subtract from sender's frozen balance
balanceOf[msg.sender] = SafeMath.safeAdd(balanceOf[msg.sender], _value); // Add to the sender
Unfreeze(msg.sender, _value); // emit event
return true;
}
function withdrawEther(uint256 amount) public {
// disabled
}
function() public payable {}
}