// This is the HEADER FILE money.h. This is the INTERFACE for the class // Money. Values of this type are amounts of money in U.S. currency. #ifndef MONEY_H #define MONEY_H #include <iostream> class Money { long all_cents; // monetary value stored as pennies public: // Initializes the object to $0.00. Money(void); // Initializes the object to dollars*100 cents. Money(long dollars); // Initializes the object to dollars*100 + cents. Money(long dollars, short cents); // Postcondition: return value is sum of calling object and amount. // neither amount nor calling object are changed. Money add(const Money & amount) const; // Postcondition: return value is difference of calling object and amount. // neither amount nor calling object are changed. Money subtract(const Money & amount) const; // Postcondition: return value is arithmetic negation of calling object. // calling object is not changed. Money negate(void) const; // Returns true if the calling object equals the amount, false otherwise. bool equals(const Money & amount) const; // Returns true if the calling object is less than the amount, // false otherwise. bool less(const Money & amount) const; // Postcondition: calling object's value is read from the stream // in normal U.S. format: $ddd.cc. void input(std::istream & ins); // Postcondition: calling object's value is printed on the stream // in normal U.S. format: $ddd.cc. (calling object // is not changed) void output(std::ostream & outs) const; // Returns amount of money in decimal format. double get_value(void) const; }; #endif
Note: This interface file is adapted from ones given in textbooks by Walter Savitch.
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