Warm-up Exercises

1. Consider the following partial class definition:

public class Book
{
    private string title;
    private string author;
    private string publisher;
    private int copiesSold;
}

1. Write a statement that would create a Book object.
2. Write a “getter” and a “setter” for the title attribute.
3. Write a constructor for the Book class taking at least one argument.

Questions

1. How do you make reference to a public property Name outside of the class (for instance, in the Main method)?

• *Name
• +Name
• .Name
• None of these

1. In C#, you should think of the class’s properties as the class’s attributes.

• Yes
• No

1. The property notation allows the client to directly manipulate the private instance variable.

• Yes
• No

1. Consider the code:

public void SetName(string tempAccountName)
{
name = tempAccountName; // store the account name
}

Which of the following statements is false? - [ ] The first line of each method declaration is the method header. - [ ] The method’s return type specifies the type of data the method returns to its caller after performing its task. - [ ] The return type void indicates that when SetName() completes its task, it does not return any information to its calling method. - [ ] All methods require at least one parameter to provide data to perform tasks.

1. A return type of _____ is specified for a method that does not return a value.

• int
• double
• void
• None of the above.

1. Methods are called by writing the name of the method followed by _____ enclosed in parentheses.

• a condition
• argument(s)
• a counter
• None of the above.

1. The parameter list in the method header and the arguments in the method call must agree in:

• Number
• Type
• Order
• All of the above

1. Suppose method1 is declared as

public void method1(int a, float b, string c)

Which of the following methods does not overload method1? - [ ] void method2(int a, float b, char c) - [ ] int method1(float a, int b, string c) - [ ] float method1(int a, float b) - [ ] string method1(string a, float b, int c)

1. Write a get method for an instance variable named total of type int.

2. Write a getter for an attribute of type string named myName.

3. Write a setter for an attribute of type int named myAge.

4. Assuming name is a string instance variable, there is a problem with the following setter. What is the problem, and how would one fix it?

public int SetName1(string var){
    name = var;
}

1. Is it possible to have more than one constructor defined for a class? If yes, how can C# know which one is called?

2. What is the name of a constructor method? What is the return type of a constructor?

3. Write a constructor for a Soda class with one string attribute called name.

4. What is the “default” constructor? Do we always have the possibility of using it?

5. Why would one want to define a constructor for a class?

Problems