pragma solidity ^0.5.15;
contract ERC20 {
function totalSupply() external view returns (uint256 _totalSupply);
function balanceOf(address addr_) external view returns (uint256);
function transfer(address _to, uint256 _value) external returns (bool success);
function transferFrom(address from_, address to_, uint256 _value) external returns (bool);
function approve(address spender_, uint256 value_) external returns (bool);
function allowance(address _owner, address _spender) external returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
library SafeMath {
function mul(uint256 a, uint256 b) internal returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal returns (uint256) {
assert(b <= a);
return a - b;
}
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
function add(uint256 a, uint256 b) internal returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract STARGRAMToken is ERC20 {
using SafeMath for uint256;
string public constant symbol = "STARGRAM";
string public constant name = "STARGRAM TOKEN";
uint256 public constant decimals = 8;
address owner;
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
uint256 private constant totalsupply_ = 400000000000000000;
mapping(address => uint256) private balanceof_;
mapping(address => mapping(address => uint256)) private allowance_;
constructor() public{
balanceof_[msg.sender] = totalsupply_;
owner = msg.sender;
}
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
balanceof_[sender] = balanceof_[sender].sub(amount, "ERC20: transfer amount exceeds balance");
balanceof_[recipient] = balanceof_[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
function totalSupply() external view returns(uint256){
return totalsupply_;
}
function balanceOf(address addr_) external view returns(uint256){
return balanceof_[addr_];
}
function transfer(address _to, uint256 _value) public returns (bool) {
_transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address from_, address to_, uint256 _value) external returns (bool){
require(_value <= balanceof_[from_]);
require(_value <= allowance_[from_][msg.sender]);
require(to_ != address(0));
balanceof_[from_] =balanceof_[from_].sub(_value);
allowance_[from_][msg.sender] = allowance_[from_][msg.sender].sub(_value);
balanceof_[to_] =balanceof_[to_].add(_value);
emit Transfer(from_, to_, _value);
return true;
}
function approve(address spender_, uint256 value_) external returns (bool){
require(spender_ != address(0));
bool status = false;
if(balanceof_[msg.sender] >= value_){
allowance_[msg.sender][spender_] = value_;
emit Approval(msg.sender, spender_, value_);
status = true;
}
return status;
}
function allowance(address _owner, address _spender) external returns (uint256 remaining) {
return allowance_[_owner][_spender];
}
}
{
"compilationTarget": {
"STARGRAMToken.sol": "STARGRAMToken"
},
"evmVersion": "istanbul",
"libraries": {},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_owner","type":"address"},{"indexed":true,"internalType":"address","name":"_spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":false,"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"internalType":"address","name":"_spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender_","type":"address"},{"internalType":"uint256","name":"value_","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"addr_","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from_","type":"address"},{"internalType":"address","name":"to_","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]