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  • Question

  • 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;
            }
        }
    }
}

  • 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"); 
        } 
    } 
}
     

    • Properties problems

    Search Results

    • 1. A property can be declared inside a namespace or a procedure.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. 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
    • 3. A property can be declared inside a class, struct, Interface.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. If Sample class has a Length property with get and set accessors then which of the following statements will work correctly? 

      1. Sample.Length = 20;
      2. Sample m = new Sample(); 
m.Length = 10;
      3. Console.WriteLine(Sample.Length);
      4. Sample m = new Sample(); 
int len;
len = m.Length;
      5. Sample m = new Sample(); 
m.Length = m.Length + 20;

    • Options
    • A. 1, 3
    • B. 2, 4, 5
    • C. 4 only
    • D. 3, 5
      • Discuss
    • 5. 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
    • 6. Which of the following is the Object Oriented way of handling run-time errors?

    • Options
    • A. OnError
    • B. HERESULT
    • C. Exceptions
    • D. Error codes
    • E. Setjump and Longjump
      • Discuss
    • 7. Which of the following statements is correct about an Exception?

    • Options
    • A. It occurs during compilation.
    • B. It occurs during linking.
    • C. It occurs at run-time.
    • D. It occurs during Just-In-Time compilation.
    • E. It occurs during loading of the program.
      • Discuss
    • 8. Which of the following statements is correct about the C#.NET program given below if a value "ABCD" is input to it? 

      using System;
namespace CuriousTabConsoleApplication
{
    class MyProgram
    {
        static void Main(string[] args)
        {
            int index; 
            int val = 55; 
            int[] a = new int[5]; 
            try
            {
                Console.Write("Enter a number: ");
                index = Convert.ToInt32(Console.ReadLine());
                a[index] = val;
            }
            catch(FormatException e)
            {
                Console.Write("Bad Format ");
            }
            catch(IndexOutOfRangeException e)
            {
                Console.Write("Index out of bounds ");
            }
            Console.Write("Remaining program ");
        }
    }
}

    • Options
    • A. It will output: Bad Format
    • B. It will output: Remaining program
    • C. It will output: Index out of bounds
    • D. It will output: Bad Format Remaining program
    • E. It will output: Index out of bounds Remaining program
      • Discuss
    • 9. Which of the following statements is correct about the C#.NET program given below if a value "6" is input to it? 

      using System;
namespace CuriousTabConsoleApplication
{
    class MyProgram
    {
        static void Main (string[] args)
        {
            int index; 
            int val = 66; 
            int[] a = new int[5]; 
            try
            {
                Consote.Write("Enter a number: "); 
                index = Convert.ToInt32(Console.ReadLine()); 
                a[index] = val;
            }
            catch(Exception e)
            {
                Console.Write("Exception occurred ");
            }
            Console.Write("Remaining program ");
        }
    }
}

    • Options
    • A. It will output: Exception occurred
    • B. It will output: Remaining program
    • C. It will output: Exception occurred Remaining program
    • D. It will output: Remaining program Exception occurred
    • E. The value 66 will get assigned to a[6].
      • Discuss
    • 10. Which of the following statements is correct about the C#.NET program given below if a value "ABCD" is input to it? 

      using System;
namespace CuriousTabConsoleApplication
{
    class MyProgram
    {
        static void Main(string[] args)
        {
            int index; 
            int vat = 88;
            int[] a = new int(5];
            try
            {
                Console.Write("Enter a number: ");
                index = Convert.Toint32(Console.ReadLine());
                a[index] = val;
            }
            catch(Exception e)
            {
                Console.Write("Exception occurred");
            }
            Console.Write("Remaining program");
        }
    }
}

    • Options
    • A. It will output: Exception occurred
    • B. It will output: Remaining program
    • C. It will output: Remaining program Exception occurred
    • D. It will output: Exception occurred Remaining program
    • E. The value 88 will get assigned to a[0].
      • Discuss

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