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CHAP. 9]
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return n; } void reverse(string& s) { string temp = s; int len = s.length(); for (int i=0; i<len; i++) s[i] = temp[len-i-1]; } bool is_palindrome(string s) { int len = s.length(); for (int i=0; i<len/2; i++) if (s[i] != s[len-i-1]) return false; return true; } bool more(ifstream& fin, string& s) { if (getline(fin, s)) return true; else return false; } bool copy(ofstream& fout, ifstream& fin, string& s) { fout << s << endl; cout << s << endl; return more(fin,s); } int main() { ifstream fin1("Democrats.dat"); ifstream fin2("Republicans.dat"); ofstream fout("Presidents.dat"); string s1, s2; bool more1 = more(fin1, s1); bool more2 = more(fin2, s2); while (more1 && more2) if (s1 < s2) more1 = copy(fout, fin1, s1); else more2 = copy(fout, fin2, s2); while (more1) more1 = copy(fout, fin1, s1); while (more2) more2 = copy(fout, fin2, s2); fout << endl; }
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10.1 INTRODUCTION A class is like an array: it is a derived type whose elements have other types. But unlike an array, the elements of a class may have different types. Furthermore, some elements of a class may be functions, including operators. Although any region of storage may generally be regarded as an object , the word is usually used to describe variables whose type is a class. Thus object-oriented programming involves programs that use classes. We think of an object as a self-contained entity that stores its own data and owns its own functions. The functionality of an object gives it life in the sense that it knows how to do things on its own. There is much more to object-oriented programming than simply including classes in your programs. However, that is the first step. An adequate treatment of the discipline lies far beyond an introductory outline such as this. 10.2 CLASS DECLARATIONS Here is a declaration for a class whose objects represent rational numbers (i.e., fractions):
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class Ratio { public: void assign(int, int); double convert(); void invert(); void print(); private: int num, den; };
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The declaration begins with the keyword class followed by the name of the class and ends with the required semicolon. The name of this class is Ratio. The functions assign(), convert(), invert(), and print() are called member functions because they are members of the class. Similarly, the variables num and den are called member data. Member functions are also called methods and services. In this class, all the member functions are designated as public, and all the member data are designated as private. The difference is that public members are accessible from outside the class, while private members are accessible only from within the class. Preventing access from outside the class is called information hiding. It allows the programmer to compartmentalize the software which makes it easier to understand, to debug, and to maintain. The following example shows how this class could be implemented and used. 232
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CHAP. 10]
CLASSES
EXAMPLE 10.1 Implementing the Ratio Class
class Ratio { public: void assign(int, int); double convert(); void invert(); void print(); private: int num, den; }; int main() { Ratio x; x.assign(22,7); cout << "x = "; x.print(); cout << " = " << x.convert() << endl; x.invert(); cout << "1/x = "; x.print(); cout << endl; } void Ratio::assign(int numerator, int denominator) { num = numerator; den = denominator; } double Ratio::convert() { return double(num)/den; } void Ratio::invert() { int temp = num; num = den; den = temp; } void Ratio::print() { cout << num << '/' << den; } x = 22/7 = 3.14286 1/x = 7/22 Here x is declared to be an object of the Ratio class. Consequently, it has its own internal data members num and den , and it has the ability to call the four class member functions assign(), convert(), invert(), and print(). Note that a member function like invert() is called by prefixing its name with the name of its owner: x.invert(). Indeed, a member function can only be called this way. We say that the object x owns the call. An object like x is declared just like an ordinary variable. Its type is Ratio. We can think of this type as a user-defined type. C++ allows us to extend the definition of the programming language by
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