File input and OCCF

Question 1

In C++ 11 how do you open a file?

Answer 1

Question 2

When you open a file in C++, how do you test for end of file?

Answer 2

Question 3

In C++ how do you read data from a file?

Answer 3

Question 4

In C++ how do you grab single characters from a file (to build and parse a string youself)?

Answer 4

Question 5

In C++ what are other ways (other than >>) to get input from a file?

Answer 5

Question 6

In C++ how do you close a file and when should you do so?

Answer 6

Question 7

How do you get the most up-to-date string library in C++?

How do you compare two strings?

Answer 7

Question 8

How do you concatenate other data into a string in C++?

Answer 8

Question 9

What does OCCF stand for?

Answer 9

Question 10

What are the four things that every C++ class should have?

Answer 10

Question 11

What is called when an object is deleted in C++?

Answer 11

Question 12

What is the problem with destructors in C++?

Answer 12

Question 13

What is the method called when an object is destructed in Java? When is it called?

Answer 13

Question 14

What is the difference between a “shallow copy” and a “deep copy”?

Answer 14

Question 15

In the attached code, which is a newly created object, shallow and deep copy?

Answer 15

Question 16

In C++ what is the difference between a value parameter and a reference parameter?

Answer 16

Question 17

How does this code work with regard to reference parameters?

Answer 17

Question 18

What would happen in this code if we attempt to alter firstNode and have it point to newNode?

Answer 18

Question 19

Why use reference parameters in C++?

Answer 19

Question 20

How do we prevent a reference parameter from being altered in C++?

Answer 20

Question 21

How do we make a copy constructor in C++?

Answer 21

Question 22

How do default copy constructors work?

Answer 22

Question 23

What are the two places where we make a copy of an argument implicitly

Answer 23

Question 24

What is the clone method in Java and how do you overide it?

Answer 24

Object in Java has a method named clone that you can call vial super (super.clone( ))

Your class must implement a Clonable Interface and override the clone( ) method. clone ( ) might throw CloneNotSupportedException, so you have to throw or handle it as well.

Question 25

What is Assignment in the context of OCCF?

Answer 25

Question 26

In general, how to assignment overriding in C++ work?

Answer 26

Question 27

How do you code an override for assignment operator in C++?

Answer 27

Question 28

How does the assignment operator override in C++ work?

Answer 28

• Assumes that MyObject has a member data, and a method getData() to access it
• data here is actually this->data (implicitly)
• In other words, the left operand (of the = operator) is the instance on which we call the assignment “method”
• One more thing that’s very unusual is there’s a reference (&) in the return type - it’s actually modifying its “left” operand and then returns it (the new version)

Question 29

In general what is overloading?

Answer 29

Question 30

What are the OCCF’s so important in C++?

Answer 30

Question 31

How does overriding operators work in Java?

Answer 31

Question 32

How do you open and then read from a file in C++?

Answer 32

ifstream myFile;

myFile.open(“text.txt”);

string line;

getline(myFile, line);