C++primer 7.1.2 sessions

Practice 7,2

1#include <iostream>2#include <string>3 using namespacestd;4 5 structSales_data {6     stringBookno;7 unsigned units_sold;8     DoublePrice =0.0;9     DoubleRevenue =0.0;TenSales_data &combine (Constsales_data&); One     stringISBN ()Const{returnBookno;} A }; -  -Sales_data & Sales_data::combine (ConstSales_data &RHS) the { -Units_sold + =Rhs.units_sold; -Revenue + =rhs.revenue; -         return* This; + } -  + intMain () A { at Sales_data item1, item2; -     DoubleTotalrevenue =0; -     DoubleTotalsold =0; -     intCounter =1; -     if(Cin >> Item1.bookno >> item1.units_sold >>Item1.price) -     { inItem1.revenue = Item1.price *Item1.units_sold; -          while(Cin >> Item2.bookno >> item2.units_sold >>item2.price) { toItem2.revenue = Item2.price *Item2.units_sold; +             if(Item1.bookno = =item2.bookno) { - Item1.combine (item2); the++counter; *             } $             Else {Panax Notoginsengcout << ITEM1.ISBN () <<" "<< Item1.units_sold <<" "<< item1.revenue <<"Times :"<< counter <<Endl; -Item1.bookno =Item2.bookno; theItem1.units_sold =Item2.units_sold; +Item1.revenue =item2.revenue; ACounter =1; the             } +         } -cout << Item1.bookno <<" "<< Item1.units_sold <<" "<< item1.revenue <<"Times :"<< counter <<Std::endl; $     } $     return 0; -}

Exercise 7.3

See above code

Exercise 7.4

1 struct Person {2     string person_name; // Name of person 3     string person_add; // address of person in residence 4 };

Exercise 7.5

1         string Const return Person_name;} 2     string Const return person_addr; }    

Should be const, the object referred to in this is not changed in the body of the two functions, so setting this to a pointer to a constant will help increase the flexibility of the function.

C++primer 7.1.2 sessions