pragma solidity >=0.4.22 <0.7.0;
contract SimpleToken{
mapping(address => uint256) public balanceOf;
uint id;
constructor() public{
balanceOf[msg.sender] = 1000000;
}
function transfer(address _to, uint256 _value) public{
require(balanceOf[msg.sender] >= _value);
require(balanceOf[_to] + _value >= balanceOf[_to]);
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
}
}