求大神指导

妈呀这我看不懂

#include <iostream>
#include <cstring>
#include <cstdlib>
using namespace std;
class Employee{
private:
int Id;
string Name;
int Salary;
public:
Employee(int id, string name, int salary){
Id=id;
Name=name;
if(salary>=0)
Salary=salary;
else {
cout<<"salary can't be negative";
exit(0);
}
}
void Set_Id(int id){
Id=id;
}
void Set_Name(string name){
Name=name;
}
void Set_Salary(int salary){
if(salary>=0)
Salary=salary;
else {
cout<<"salary can't be negative";
exit(0);
}
}
int get_Id(){
return Id;
}
string get_Name(){
return Name;
}
int get_Salary(){
return Salary;
}
void Show(){
cout<<"Employee "<<Id<<":"<<Name<<";"<<"Yearly Salary: "<<Salary<<endl;
}
};
int main(){
Employee Bob(1,"Bob jones",34500), Susan(2,"Susan Baker",37800);
Bob.Show();
Susan.Show();
float Inc_Salary=10;
cout<<"Increasing employee salaries by "<<Inc_Salary<<"%"<<endl;
Bob.Set_Salary(int(Bob.get_Salary()*(Inc_Salary/100+1.0)));
Susan.Set_Salary(int(Susan.get_Salary()*(Inc_Salary/100+1.0)));
Bob.Show();
Susan.Show();
return 0;
}

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