每次都会出现编译器错误，但顶部却有编译指示

Question

错误：预期的导入指令或合同定义。每次，即使有了代码。我现在正在看的，不起作用

pragma solidity ^0.4.0;

interface Regulator {
    function checkValue(uint amount) returns(bool);
    function loan() returns(bool);
}

contract Bank is Regulator {
    uint private value;
    address private owner;

    function Bank(uint amount){
        value = amount;
        owner = msg.sender;

    }

    modifier ownerFunc {
        require(owner == msg.sender)
        _;
    }

    function deposit(uint amount) {
        value +- amount;
    }
    function withdraw(uint amount){
        if(checkValue(amount)){

        value -= amount;   
        }
    }

    function balance() returns(uint) {
        return value;
    }

    function loan() returns(bool) {
        return value > 0;
    }

    function checkValue(uint amount) returns(bool) {
        return amount =< value;
    }
}

浏览器/Untitled.sol:3:1：错误：预期的导入指令或合同定义。 接口调节器{ ^