Конструктор и деструктор- компаний

#include <iostream.h>
#include <math.h>
class companie
{
double kolicestvo,CENA;
char compani[30];
public:
companie(){kolicestvo=CENA=0;}
companie(double kol_product,double CENA_product,char compani_nr[30]){kolicestvo=kol_product;CENA=CENA_product;compani[30]=compani_nr[30];}
companie(companie&);
void read();
void show();
double god_prodaji();
double suma_vseh_god_prodaj();
double dolya_rinka();
};
 
double companie::god_prodaji(){return (kolicestvo*CENA);    }
 
double companie::suma_vseh_god_prodaj(){
double s; int i;
for(i=0;i<3;i++){s=s+god_prodaji();}
return (s);}
 
double companie::dolya_rinka(){
return (god_prodaji()*100/suma_vseh_god_prodaj());  
}
 
void companie::read(){
cout<<"Vvedite daniie o kompanie:"<<endl;
cout<<"----------------------------"<<endl;
cout<<"Nazvanie:"<<endl;
cin>>compani;
 
cout<<"Colicestvo:"<<endl;
cin>>kolicestvo;
 
cout<<"Cena producta:"<<endl;
cin>>CENA;
 
 
}
void companie::show()
{
cout<<"-----------------"<<endl;
cout<<"Nazvanie companii:"<<compani<<endl;
cout<<"Colicestvo productov:"<<kolicestvo<<endl;
cout<<"CENA:"<<CENA<<" $"<<endl;
cout<<"Godovie prodaji:"<<god_prodaji()<< "$"<<endl;
cout<<"Dolya rinka:"<<dolya_rinka()<< "%"<<endl;
}
 
 
main()
{
companie a[3];
int i;
for(i=0;i<3;i++){
a[i].read();}
for(i=0;i<3;i++){
a[i].show();
cout<<"Suma"<<a[i].suma_vseh_god_prodaj()<<endl;
cout<<"-------------"<<endl;
}
 
 
 
return 0;
 
}