What property of a C# array indicates its allocated size? What keyword in the base class allows a method to be polymorphic?

Transcription

1 What property of a C# array indicates its allocated size? a. Size b. Count c. Length What property of a C# array indicates its allocated size? a. Size b. Count c. Length What keyword in the base class allows a method to be polymorphic? a. protected b. virtual c. override What keyword in the base class allows a method to be polymorphic? a. protected b. virtual c. override What keyword in the derived class allows a method to be polymorphic? a. protected b. virtual c. override 1

2 What keyword in the derived class allows a method to be polymorphic? a. protected b. virtual c. override What operator associates an object with a member of that object? a.. b. :: c. -> What operator associates an object with a member of that object? a.. b. :: c. -> By default, all members of a class are what? a. public b. private c. protected By default, all members of a class are what? a. public b. private c. protected Which C# operator is used to dynamically allocate memory? a. new b. allocate c. reserve 2

3 Which C# operator is used to dynamically allocate memory? a. new b. allocate c. reserve What process does C# use to reclaim memory previously allocated via the new operator? a. Garbage collection b. Recycling c. Renewal What process does C# use to reclaim memory previously allocated via the new operator? a. Garbage collection b. Recycling c. Renewal What word associates a member of a class with the class itself instead of an object of that class? a. static b. protected c. var What word associates a member of a class with the class itself instead of an object of that class? a. static b. protected c. var Which keyword means private to other classes but public to subclasses? a. public b. private c. protected 3

4 Which keyword means private to other classes but public to subclasses? a. public b. private c. protected How many times is Hi printed? for (int i = 0; i < 10; i++) for (int j = 0; j < 10; j++) a c. 1,000 for (int k = 0; k < 10; k++) Console.WriteLine( Hi ); How many times is Hi printed? for (int i = 0; i < 10; i++) for (int j = 0; j < 10; j++) a c. 1,000 for (int k = 0; k < 10; k++) Console.WriteLine( Hi ); What is not true about a constructor? a. Has same name as class b. Must specify at least one parameter c. Has no return value indicated What is not true about a constructor? a. Has same name as class b. Must specify at least one parameter c. Has no return value indicated What special symbol differentiates a destructor from a constructor? a. -> b. ~ c.! 4

5 What special symbol differentiates a destructor from a constructor? a. -> b. ~ c.! What kind of loop simplifies iterating over the elements in an array? a. while b. foreach c. goto What kind of loop simplifies iterating over the elements in an array? a. while b. foreach c. goto What literal value may be assigned to an object reference of any type? a. null b. void c. nil What literal value may be assigned to an object reference of any type? a. null b. void c. nil int[] a = 1, 2, 3, 4, 5 ; What expression represents the element 3? a. a[3] b. a[2] c. a[4] 5

6 int[] a = 1, 2, 3, 4, 5 ; What expression represents the element 3? a. a[3] b. a[2] c. a[4] int[] a = 3, 7, 2, 5, 1 ; What is a[2]? a. 2 b. 7 int[] a = 3, 7, 2, 5, 1 ; What is a[2]? a. 2 b. 7 int[] a = 5, 2, 3, 8, 3 ; What is a.length? a. 4 b. 5 int[] a = 5, 2, 3, 8, 3 ; int[] a = 19, 23, 23, 14, 8 ; What is a.length? a. 4 b. 5 What is a[0]? a. 19 b. 8 6

7 int[] a = 19, 23, 23, 14, 8 ; int[] a = 2, 5, 3, 8, 5, x = 2; What is a[0]? a. 19 b. 8 What is a[x]? a. 5 int[] a = 2, 5, 3, 8, 5, x = 2; int[] a = 10, 2, 35, 4, 50, x = 2; What is a[x]? a. 5 What is a[x] + 1? a. 36 int[] a = 10, 2, 35, 4, 50, x = 2; What is a[x] + 1? a. 36 int[] a = 10, 2, 35, 4, 50, x = 2; What is a[x + 1]? a. 36 7

8 int[] a = 10, 2, 35, 4, 50, x = 2; What is a[x + 1]? a. 36 int[] a = 10, 2, 35, 4, 50 ; What is a[a[3]]? a. 50 int[] a = 10, 2, 35, 4, 50 ; What is a[a[3]]? a. 50 int[] a = 10, 3, 1, 4, 50, x = 2; What is a[a[x]]? a. 1 int[] a = 10, 3, 1, 4, 50, x = 2; int[] a = 10, 3, 1, 4, 50, x = 0; What is a[a[x]]? a. 1 What is a[a[x]]? a. 1 b. 50 8

9 int[] a = 10, 3, 1, 4, 50, x = 0; What is a[a[x]]? a. 1 b. 50 int[] a = 10, 3, 1, 14, 50 ; foreach (var item in a) Console.WriteLine(item); What is printed on the fourth line? a. 14 b. 50 int[] a = 10, 3, 1, 14, 50 ; foreach (var item in a) Console.WriteLine(item); What is printed on the fourth line? a. 14 b. 50 int[] a = 1, 3, 1, 14, 3, x = 0; foreach (var item in a) x += item; Console.WriteLine(x); What is printed? a. 22 int[] a = 1, 3, 1, 14, 3, x = 0; foreach (var item in a) x += item; Console.WriteLine(x); What is printed? a. 22 int[] a = 1, 3, 1, 4, 3 ; for (int i = a.length; i >= 0; i--) Console.WriteLine(a[i]); What is printed on the second line? a. 4 b. 1, it s an error 9

10 int[] a = 1, 3, 1, 4, 3 ; for (int i = a.length; i >= 0; i--) Console.WriteLine(a[i]); What is printed on the second line? a. 4 b. 1, it s an error int[] a = 1, 3, 1, 4, 3 ; for (int i = a.length - 1; i >= 0; i--) Console.WriteLine(i); What is printed on the second line? a. 3 b. 12 int[] a = 1, 3, 1, 4, 3 ; for (int i = a.length - 1; i >= 0; i--) Console.WriteLine(i); What is printed on the second line? a. 3 b