请哪位达人分析下c++代码的错误。。能解释下更好

#include<iostream>

class Employee
{
public:
    unsigned int getAge() const;
    unsigned int getYearsOfService() const;
    double getSalary() const;
    void setAge(unsigned int tage);
    void setYearsOfService(unsigned int tyearsOfService);
    void setSalary(double tsalary);
    Employee(unsigned int tage);
    ~Employee();
private:
    unsigned int age;
    unsigned int yearsOfService;
    double salary;
}
Employee::Employee(unsigned int tage)
{
    age = tage;

}
Employee::~Employee(){}
unsigned int Employee::getAge() const
{
    return(age);
}
unsigned int Employee::getYearsOfService() const
{
    return(yearsOfService);
}
double Employee::getSalary() const
{
    return(salary);
}
void Employee::setAge(unsigned int tage)
{
    age = tage;
}
void Employee::setYearsOfService(unsigned int tyearsOfService)
{
    yearsOfService = tyearsOfService;
}
void Employee::setSalary(double tsalary)
{
    salary = tsalary;
}

int main()
{
    Employee employee(20);
    std::cout<< employee.getAge();
    return 0;
}