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C++ from the Ground Up
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// Add a null-terminated string to an str_type object str_type str_type::operator+(char *str) { str_type temp; strcpy(tempstring, string); strcat(tempstring, str); return temp; }
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Look carefully at these functions Notice that the right-side argument is not an object of type str_type, but simply a pointer to a null-terminated character array that is, a normal C++ string However, both functions return an object of type str_type Although the functions could, in theory, return some other type, it makes the most sense to return a str_type object, since the targets of these operations are also str_type objects The advantage to defining a string operation that accepts a null-terminated string as the right-side operand is that it allows you to write certain statements in a natural way For example, these are now valid statements:
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str_type a, b, c; a = "hi there"; // assign a null-terminated string to an object c = a + " George"; /* concatenate an object with a null-terminated string */
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The following program incorporates the additional meanings of the + and = operators:
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// Expanding the string type #include <iostream> #include <cstring> using namespace std; class str_type { char string[80]; public: str_type(char *str = "") { strcpy(string, str); } str_type operator+(str_type str); str_type operator+(char *str); str_type operator=(str_type str); str_type operator=(char *str); void show_str() { cout << string; } } ;
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Operator Overloading
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str_type str_type::operator+(str_type str) { str_type temp; strcpy(tempstring, string); strcat(tempstring, strstring); return temp; } str_type str_type::operator=(str_type str) { strcpy(string, strstring); return *this; } str_type str_type::operator=(char *str) { str_type temp; strcpy(string, str); strcpy(tempstring, string); return temp; } str_type str_type::operator+(char *str) { str_type temp; strcpy(tempstring, string); strcat(tempstring, str); return temp; } int main() { str_type a("Hello "), b("There"), c; c = a + b; cshow_str(); cout << "\n"; a = "to program in because"; ashow_str(); cout << "\n"; b = c = "C++ is fun"; c = c+" "+a+" "+b; cshow_str(); return 0; }
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This program displays this on the screen:
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Hello There to program in because C++ is fun to program in because C++ is fun
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C++ from the Ground Up
Before continuing, you should make sure that you understand how this output is created On your own, try creating other string operations For example, you might try defining the so that it performs a substring deletion For example, if object A s string is This is a test and object B s string is is , then A B yields th a test In this case, all occurrences of the substring are removed from the original string Also, define a friend function that allows a null-terminated string to appear on the left side of the + operator Finally, add all necessary error checking
IP: You will want to experiment with operator overloading relative to classes that you create As the examples in this chapter have shown, you can use operator overloading to add new data types to your programming environment This is one of C++ s most powerful features
Inheritance
C++ from the Ground Up
nheritance is one of the cornerstones of OOP because it allows the creation of hierarchical classifications With inheritance, it is possible to create a general class that defines traits common to a set of related items This class may then be inherited by other, more specific classes, each adding only those things that are unique to the inheriting class In standard C++ terminology, a class that is inherited is referred to as a base class The class that does the inheriting is called the derived class Further, a derived class can be used as a base class for another derived class In this way, a multilayered class hierarchy can be achieved
Introducing Inheritance
A base class is inherited by a derived class
C++ supports inheritance by allowing one class to incorporate another class into its declaration Before discussing the theory and details, let s begin with an example of inheritance The following class, called road_vehicle, very broadly defines vehicles that travel on the road It stores the number of wheels a vehicle has and the number of passengers it can carry
class road_vehicle { int wheels; int passengers; public: void set_wheels(int num) { wheels = num; } int get_wheels() { return wheels; } void set_pass(int num) { passengers = num; } int get_pass() { return passengers; } };
You can use this broad definition of a road vehicle to help define specific types of vehicles For example, the fragment shown here inherits road_vehicle to create a class called truck
class truck : public road_vehicle { int cargo; public: void set_cargo(int size) { cargo = size; } int get_cargo() { return cargo; } void show(); };
Because truck inherits road_vehicle, truck includes all of road_vehicle It then adds cargo to it, along with the supporting member functions Notice how road_vehicle is inherited The general form for inheritance is shown here: class derived-class : access base-class { body of new class }
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