Properties problems
- 1. If Sample class has a Length property with get accessor then which of the following statements will work correctly?
Options- A.
Sample m = new Sample(); m.Length = 10; - B.
Sample m = new Sample(); m.Length = m.Length + 20; - C.
Sample m = new Sample(); int l; l = m.Length; - D.
Sample.Length = 20; - E.
Console.WriteLine(Sample.Length);
Discuss
Correct Answer:
Sample m = new Sample();
int l;
l = m.Length;- 2. An Employee class has a property called age and emp is reference to a Employee object and we want the statement Console.WriteLine(emp.age) to fail. Which of the following options will ensure this functionality?
Options- A. Declare age property with only get accessor.
- B. Declare age property with only set accessor.
- C. Declare age property with both get and set accessors.
- D. Declare age property with get, set and normal accessors.
- E. None of the above Discuss
Correct Answer: Declare age property with only set accessor.
- 3. If Sample class has a Length property with get and set accessors then which of the following statements will work correctly?
Sample.Length = 20;
Sample m = new Sample(); m.Length = 10;
Console.WriteLine(Sample.Length);
Sample m = new Sample(); int len; len = m.Length;
Sample m = new Sample(); m.Length = m.Length + 20;
Options- A. 1, 3
- B. 2, 4, 5
- C. 4 only
- D. 3, 5 Discuss
Correct Answer: 2, 4, 5
- 4. A property can be declared inside a class, struct, Interface.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. Which of the following statements is correct about properties used in C#.NET?
Options- A. Every property must have a set accessor and a get accessor.
- B. Properties cannot be overloaded.
- C. Properties of a class are actually methods that work like data members.
- D. A property has to be either read only or a write only. Discuss
Correct Answer: Properties of a class are actually methods that work like data members.
- 6. A property can be declared inside a namespace or a procedure.
Options- A. True
- B. False Discuss
Correct Answer: False
- 7. Suppose a Student class has an indexed property. This property is used to set or retrieve values to/from an array of 5 integers called scores[]. We want the property to report "Invalid Index" message if the user attempts to exceed the bounds of the array. Which of the following is the correct way to implement this property?
Options- A.
class Student { int[] scores = new int[5] {3, 2, 4,1, 5}; public int this[ int index ] { set { if (index < 5) scores[index] = value; else Console.WriteLine("Invalid Index"); } } } - B.
class Student { int[] scores = new int[5] {3, 2, 4, 1, 5}; public int this[ int index ] { get { if (index < 5) return scores[ index ]; else { Console.WriteLine("Invalid Index"); return 0; } } set { if (index < 5) scores[ index ] = value; else Console.WriteLine("Invalid Index"); } } } - C.
class Student { int[] scores = new int[5] {3, 2, 4, 1, 5}; public int this[ int index ] { get { if (index < 5) return scores[ index ]; else { Console.WriteLine("Invalid Index"); return 0; } } } } - D.
class Student { int[] scores = new int[5] {3, 2, 4, 1, 5}; public int this[ int index ] { get { if (index < 5) scores[ index ] = value; else { Console.WriteLine("Invalid Index"); } } set { if (index < 5) return scores[ index ]; else { Console.WriteLine("Invalid Index"); return 0; } } } }
Discuss
Correct Answer:
class Student
{
int[] scores = new int[5] {3, 2, 4, 1, 5};
public int this[ int index ]
{
get
{
if (index < 5)
return scores[ index ];
else
{
Console.WriteLine("Invalid Index"); return 0;
}
}
set
{
if (index < 5)
scores[ index ] = value;
else
Console.WriteLine("Invalid Index");
}
}
}More in C# Programming:
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