Write A C++ Program To Find Electricity Bill Of A Person.

unit tarrif 
 >100 RS.1.20 per unit 
 >200 RS.2 per unit 
 >300 RS.3 per unit 
 #include<iostream.h> 
 #include<conio.h> 
 class ebill 
 { 
      private: 
      int cno; 
      char cname[20]; 
      int units; 
      double bill; 
      public: 
                 void get() 
         { 
                  cout<<"Enter Customer No,Name and No. of Units" <<endl; 
                  cout<<"Enter Customer No : "; 
                  cin>>cno; 
                  cout<<"\nEnter Customer Name : "; 
                  cin>>cname; 
                  cout<<"\nEnter No. of Units used : "; 
                  cin>>units; 
          } 
                 void put() 
          { 
                 cout<<"\nCustomer No is : "<<cno; 
                 cout<<"\nCustomer Name is : "<<cname; 
                 cout<<"\nNumber of Units Consumed : "<<units; 
                 cout<<"\nBill of Customer : "<<bill; 
          } 
                 void calc() 
         { 
                 if(units<=100) 
                        bill=units*1.20; 
                else if(units<=300) 
                        bill=100*1.20+(units-100)*2; 
                else 
                        bill=100*1.20+200*2+(units-300)*3; 
          } 
 }; 
              void main() 
      { 
              clrscr(); 
              ebill p1; 
              p1.get(); 
              p1.calc(); 
              p1.put(); 
              getch(); 
       }