第一课作业

第一课代码

@@ -0,0 +1,32 @@
+pragma solidity ^0.4.14;
+
+contract Payroll{
+    uint salary = 1 ether;
+    address frank = 0xca35b7d915458ef540ade6068dfe2f44e8fa733c;
+    uint constant payDuration = 10 seconds;
+    uint lastPayday = now;
+
+    function addFund() payable returns (uint) {
+        return this.balance;
+    }
+
+    function calculateRunaway() returns(uint) {
+        return this.balance / salary;
+    }
+
+    function hasEnoughFund() returns(bool) {
+        return calculateRunaway() > 0;
+    }
+
+    function getPaid()  {
+        if (msg.sender != frank) {
+            revert();
+        }
+        uint nextPayDay = lastPayday + payDuration;
+        if (nextPayDay > now) {
+            revert();
+        }
+            lastPayday = nextPayDay;
+            frank.transfer(salary);
+    }
+}

第一课作业

@@ -0,0 +1,41 @@
+pragma solidity ^0.4.14;
+
+contract Payroll{
+    uint salary = 1 ether;
+    address Lisa；
+    address Employee;
+    uint constant payDuration = 8 seconds;
+    uint lastPayday = now;
+
+    function set(uint new salary) {
+      salary = newsalary * 200 wei;
+    }
+
+    function set(address Employee) {
+       Lisa = Employee;
+    }
+
+    function addFund() payable returns (uint) {
+        return this.balance;
+    }
+
+    function calculateRunaway() returns(uint) {
+        return this.balance / salary;
+    }
+
+    function hasEnoughFund() returns(bool) {
+        return calculateRunaway() > 0;
+    }
+
+    function getPaid()  {
+        if (msg.sender != frank) {
+            revert();
+        }
+        uint nextPayDay = lastPayday + payDuration;
+        if (nextPayDay > now) {
+            revert();
+        }
+            lastPayday = nextPayDay;
+            frank.transfer(salary);
+    }
+}

第三课作业

@@ -0,0 +1,95 @@
+pragma solidity ^0.4.14;
+
+contract Payroll {
+
+    struct Employee {
+        address id;
+        uint salary;
+        uint lastPayday;
+    }
+
+    uint constant payDuration = 10 seconds;
+    uint totalSalary;
+    address owner;
+    mapping(address => Employee) public employees;
+
+    function Payroll() {
+        owner = msg.sender;
+    }
+
+    modifier onlyOwener {
+        require(msg.sender == owner);
+        _;
+    }
+
+    modifier employeeExist(address employeeId) {
+        var employee = employees[employeeId];
+        assert(employee.id == 0x0);
+        _;
+
+    }
+    function _partialPaid(Employee employee) private {
+        uint payment = employee.salary * (now - employee.lastPayday) / payDuration;
+        employee.id.transfer(payment);
+    }
+
+    function addEmployee(address employeeId, uint salary) onlyOwener {
+        var employee = employees[employeeId];
+        assert(employee.id == 0x0);
+
+        employees[employeeId] = Employee(employeeId, salary * 1 ether, now);
+        totalSalary += employees[employeeId].salary;
+    }
+
+    function removeEmployee(address employeeId) onlyOwener employeeExist(employeeId) {
+        var employee = employees[employeeId];
+
+        _partialPaid(employee);
+        totalSalary -= employees[employeeId].salary;
+        delete employees[employeeId];
+    }
+
+    function updateEmployee(address employeeId, uint salary)onlyOwener employeeExist(employeeId) {
+        var employee = employees[employeeId];
+
+        _partialPaid(employee);
+        totalSalary -= employees[employeeId].salary;
+        employees[employeeId].salary = salary * 1 ether;
+        totalSalary += employees[employeeId].salary;
+        employees[employeeId].lastPayday = now;
+    }
+
+    function changePaymentaddress(address employeeId) onlyOwener employeeExist(employeeId) {
+        var employee = employees[employeeId];
+
+        _partialPaid(employee);
+        totalSalary -= employees[employeeId].salary;
+        delete employees[employeeId];
+        assert(employee.id == 0x0);
+
+        employees[employeeId] = Employee(employeeId, salary * 1 ether, now);
+        totalSalary += employees[employeeId].salary;
+
+    }
+    function addFund() payable returns (uint) {
+        return this.balance;
+    }
+
+    function calculateRunway() returns (uint) {
+        return this.balance / totalSalary;
+    }
+
+    function hasEnoughFund() returns (bool) {
+        return calculateRunway() > 0;
+    }
+
+    function getPaid() employeeExist(msg.sender) {
+        var employee = employees[msg.sender];
+
+        uint nextPayday = employee.lastPayday + payDuration;
+        assert(nextPayday < now);
+
+        employees[msg.sender].lastPayday = nextPayday;
+        employee.id.transfer(employee.salary);
+    }
+}