C Plus Plus Project : Company management

Cpp Project: Company management 

 //Company management  
 #include<iostream>  
 #include<fstream>  
 #include<string.h>  
 #include<stdlib.h>  
 using namespace std;  
 class earn  
 {  
 public:  
   long double profit;  
   void show()  
   {  
     ifstream x("ooo.txt");  
     if(!x)  
       cout<<"\n() PROFIT\t\t   : 0 ";  
     else  
     {  
       x>>profit;  
       cout<<"\n() TOTAL STARTING PROFIT   : "<<profit<<"\n\n";  
       x.close();  
     }  
   }  
 };  
 class product:public virtual earn  
 {  
 public:  
   int quan;  
   char name[20];  
   char id[20];  
   double percost;  
   double persell;  
   double cost;  
   double sell;  
   void cal()  
   {  
     cost=percost*quan;  
     sell=persell*quan;  
     profit=profit +(sell-cost)*30;  
   }  
   void file();  
   void get() ;  
 };  
 void product::get()  
 {  
   int s;  
   cout<<"# HOW MANY PRODUCT PRODUCE ? : ";  
   cin>>s;  
   for(int i=0; i<s; i++)  
   {  
     cout<<"\n# input product name\t   : ";  
     cin>>name;  
     cout<<"\n# input product id\t   : ";  
     cin>>id;  
     cout<<"\n# input percost of product  : ";  
     cin>>percost;  
     cout<<"\n# input persell of product  : ";  
     cin>>persell;  
     cout<<"\n# total product quntity\t   : ";  
     cin>>quan;  
   }  
   cal();  
   file();  
 }  
 void product::file()  
 {  
   char file[30];  
   strcpy(file,id);  
   strcat(file,".txt");  
   ofstream f(file);  
   f<< "\n\n\n======>PRODUCT DETAILS<======\n"<<"\n# product name\t\t   : "<<name<< "\n\n# product id\t\t   : "<<id<<"\n\n# percost ofproduct\t   : " <<percost<<"\n\n# persell of product\t   : "<<persell<<"\n\n# quantity\t\t   : "<<quan<<"\n\n# total cost\t\t   : "<<cost<<"\n\n# total sell\t\t   : "<<sell<<"\n";  
   f.close();  
 }  
 class staff:public virtual earn  
 {  
 protected:  
   double salary;  
   char post[12];  
   char emid[10];  
   int postquan;  
   void cal()  
   {  
     profit=(profit-salary*postquan)*12;  
   }  
   void getstaff();  
   void file();  
 };  
 void staff::getstaff()  
 {  
   cout<<"\n# input salary\t\t   : ";  
   cin>>salary;  
   cout<<"\n# input postquantity\t   : ";  
   cin>>postquan;  
    cout<<"\n\n@@@ FILE IS LOADING...\n\n";  
   cal();  
   file();  
 }  
 void staff::file()  
 {  
   char file[20];  
   strcpy(file,emid);  
   strcat(file,".txt");  
   ofstream f(file);  
   f<< "\nstaff salary: "<<salary<< "\post quantity: "<<postquan;  
   f.close();  
 }  
 class ammount:public staff,public product  
 {  
 public:  
   void add();  
 };  
 void ammount::add()  
 {  
   cout<<"\n\n\n======>INPUT FOR PRODUCT<======\n\n\n";  
   get();  
   cout<<"\n\n\n======>INPUT FOR EMPLOYEE<======\n\n\n" ;  
   getstaff();  
   ofstream x("ooo.txt");  
   x<<profit;  
   x.close();  
 }  
 int main()  
 {  
   system("color 7");//color  
   while(1)  
   {  
     cout<<"\n  \t\t \t++++++++++++++++++++++++++++++++++++ \n";  
     cout<<" \t\t\t+   ""COMPANY MANAGEMENT\t  +";  
     cout<<"\n\t\t\t+\t\t\t\t  +\n\t\t\t+\t1..add\t\t\t  +\n\t\t\t+\t2..show\t\t\t  +\n\t\t\t+\t3...search\t\t  +\n\t\t\t+\t4..exit\t\t\t  +\n";  
     cout<<"\t\t\t+\t\t\t\t  +\n\t\t\t++++++++++++++++++++++++++++++++++++";  
     cout<<"\n\n# WHAT IS YOUR CHOICE? \t   : ";  
     int u;  
     cin>>u;  
     if(u==1)  
     {  
       ammount a;  
       a.show();  
       a.add();  
     }  
     else if(u==2)  
     {  
       ammount d;  
       d.show();  
     }  
     else if(u==3)  
     {  
       char id[20];  
       char c;  
       cout<<"\n# INPUT ID FOR SEARCH\t   : ";  
       cin>>id;  
       char file[20];  
       strcpy(file,id);  
       strcat(file,".txt") ;  
       ifstream x(file);  
       while(x)  
       {  
         x.get(c)  ;  
         cout<<c;  
       }  
       x.close();  
     }  
     else if(u==4)  
     {  
       cout<<"\n\n!!!!!!!! HAPPY PROGRAMMING !!!!!!!!\n\n\n";  
       break;  
     }  
     else  
       {  
         cout<<"\n";  
         cout<<"..............................\n   ERROR 404 \n YOUR input WAS WRONG (-_-)\n [ please try again ] \n..............................";  
         cout<<"\n";  
     }  
   }  
   return 0;  
 }