1

I have this token code

pragma solidity ^0.4.19;

contract MyToken {

   mapping (address => uint256) public balanceOf;

   function MyToken(uint256 _supply) public {

     balanceOf[msg.sender] = _supply;  
 }
    //ф-ция должна так называться по ERC20
    function transfer(address _to, uint _value) public
      {
    //проверка, хватает ли токенов у того, кто хочет отправить  
    require(balanceOf[msg.sender]) >= _value;

    //проверка, не произошло ли переполнение
   require(balanceOf[_to] + _value >= balanceOf[_to]);

   //забираем токены у отправителя
    balanceOf[msg.sender] -= _value;

   //передаем токены получателю
      balanceOf[_to] += _value; 
   }
}

And there is an error in the line = _value;>

0

The right line is:

require(balanceOf[msg.sender] >= _value);

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