Chapter 13. Point and Stare at Objects
In This Chapter
Examining the object of arrays of objects
Getting a few pointers on object pointers
Strong typing — getting picky about our pointers
Navigating through lists of objects
C++ programmers are forever generating arrays of things — arrays of int
s, arrays of float
s — so why not arrays of students? Students stand in line all the time — a lot more than they care to. The concept of Student
objects all lined up quietly awaiting their name to jump up to perform some mundane task is just too attractive to pass up.
Declaring Arrays of Objects
Arrays of objects work the same way arrays of simple variables work. (Chapter 7 goes into the care and feeding of arrays of simple — intrinsic — variables, and Chapters 8 and 9 describe simple pointers in detail.) Take, for example, the following snippet from the ArrayOfStudents program:
// ArrayOfStudents - define an array of Student objects // and access an element in it. This // program doesn't do anything class Student { public: int semesterHours; float gpa; float addCourse(int hours, float grade); }; void someFn()
{ // declare an array of 10 students Student s[10]; // assign the 5th student a gpa of 4.0 (lucky guy) s[4].gpa = 4.0; s[4].semesterHours = 32; // add another course to the 5th student; // this time he failed - serves him right s[4].addCourse(3, 0.0); }
Here s
is an array of Student
objects. s[4]
refers to the fifth Student
object in the array. By extension, s[4].gpa
refers to the GPA of the 5th ...
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