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Computer Science 1037A/B Lecture 23: this Pointer and Constant Member Functions

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scarlethound445
2 May 2019
School
Western University
Department
Computer Science
Course
Computer Science 1037A/B
Professor
Eric Schost

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Document Summary

By default, the compiler provides each member function of a class with an implicit parameter that points to the object through which the member function is called. A constant member function is one that does not modify the object through which it is called this pointer: Implicit parameter passed to a member function points to the object calling the function const member function: does not modify its calling object. Example(int a){ x = a;} void setvalue(int); void printaddressandvalue(); //set value of object void example::setvalue(int a) x = a; " << this << " has << "value. //print the addresses of the two object cout << "addresses of objects are " << &ob1 << "and" << &ob2. //print the addresses and values from within the member function. ob1. printaddressandvalue(); ob2. printaddressandvalue(); return 0; The object at address 0x241ff5c has value 10. The object at address 0x241ff58 has value 20.

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Related Questions

2. In this section you will be shown several classes. Inside the code for each class will be a question. You should provide your answer to the question inside the chart. Many of the questions will ask you whether a variable has changed or not. In cases that the variable being asked about is a primitive type, you should provide your answer based on the data stored in the primitive type. In cases that the variable being asked about is a reference type, you should provide your answer based on the data stored at the Object linked to by the reference type. For example, in the first snippet, the question asks about the variable x defined in the main method. Since x is a primitive type, you should answer YES if you think the variable x has had its value changed after the method methodOne() returns. All your answers should go in the chart below: (9 points) Part Answer to question x changed (circle one)? YES NO y changed (circle one)? a changed (circle one)? b changed (circle one)? d1 a changed (circle one)? b changed (circle one)? YES e words changed (circle one)? YES NO Values in array of array referred to by y: What is printed to the screen? (a) public class ReferenceTesti public static void methodOne (int x){ x++; public static void main(String[args) { int x = 0; methodOne (x); //IS THE DATA STORED OR REFERRED TO BY X THE SAME? (ANSWER IN CHART)