C# Questions & Answers - Properties and its Applications

This set of C# Multiple Choice Questions & Answers (MCQs) focuses on “Properties and its Applications”.

1. The correct way to implement a read only property add, in a math class is?
a)

```
   class math
```
```
   {
```
```
       int ad;
```
```
       public int add
```
```
       {
```
```
           get
```
```
           {
```
```
               return ad;
```
```
           }
```
```
       }
```
```
 
```
```
   }
```

```
   class math
```
```
   {
```
```
      public int add
```
```
      {
```
```
          get
```
```
          {
```
```
              return ad;    
```
```
          }
```
```
      }
```
```
  }
```

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```
   class math
```
```
   {
```
```
       int ad;
```
```
       public int add
```
```
       {
```
```
           get
```
```
           {
```
```
               return ad;
```
```
           }
```
```
           set
```
```
           {
```
```
               ad = value; 
```
```
           }
```
```
       }
```
```
   }
```

d) None of the mentioned
View Answer

Answer: a
Explanation: None.

2. The correct way to implement a write only property add in a math class?
a)

```
   class math
```
```
   {
```
```
       public int add
```
```
       {
```
```
           set
```
```
           {
```
```
                add = value;
```
```
            }
```
```
        }
```
```
    }
```

```
   class math
```
```
   {
```
```
       int ad;
```
```
       public int add
```
```
       {
```
```
           set
```
```
           {
```
```
               ad = value;
```
```
           }
```
```
       }
```
```
   }
```

```
  class math
```
```
  {
```
```
      int ad;
```
```
      public int add
```
```
      {
```
```
          get
```
```
          {
```
```
              return ad;
```
```
          }
```
```
          set
```
```
          {
```
```
              ad = value;
```
```
          }
```
```
      }
```
```
  }
```

d) None of the mentioned
View Answer

Answer: b
Explanation: None.

3. Select the correct statement about properties of read and write in C#.NET?
a) A property can simultaneously be read or write only
b) A property cannot be either read only or write only
c) A write only property will only have get accessor
d) A read only property will only have get accessor
View Answer

Answer: d
Explanation: None.

4. What will be the output of the following C# code?

```
 class number
```
```
 {
```
```
     private int num1;
```
```
     private int num2;
```
```
     public int anumber
```
```
     {
```
```
         get
```
```
         {
```
```
             return num1;
```
```
         }
```
```
         set
```
```
         {
```
```
             num1 = value;
```
```
         }
```
```
     }
```
```
     public int anumber1
```
```
     {
```
```
         get
```
```
         {
```
```
             return num2;
```
```
         }
```
```
         set
```
```
         {
```
```
             num2 = value;
```
```
         }
```
```
     }
```
```
 }
```
```
 class Program
```
```
 {
```

     public static void Main(string[] args)

```
     {
```
```
         number p = new number();
```
```
         p.anumber = 20;
```
```
         number k = new number();
```
```
         k.anumber1 = 40; 
```
```
         int m = p.anumber;
```
```
         int t = k.anumber1;
```

         int r = p.anumber + k.anumber1;

         System.Console.WriteLine("number1 = " +m);

         System.Console.WriteLine("number2 = " +t);

         System.Console.WriteLine("sum = " +r);

```
         System.Console.ReadLine();
```
```
     }
```
```
 }
```

a) 20
b)

number1 = 30
number2 = 40
sum = 70

number1 = 20
number2 = 40
sum = 60

d) Compile time error
View Answer

Answer: c
Explanation: None.
Output :

number1 = 20
number2 = 40
sum = 60

5. What will be the output of the following C# code?

```
  class number
```
```
  {
```
```
      private int num1 = 60;
```
```
      private int num2 = 20;
```
```
      public int anumber
```
```
      {
```
```
          get
```
```
          {
```
```
              return num1;
```
```
          }
```
```
          set
```
```
          {
```
```
              num1 = value;
```
```
          }
```
```
      }
```
```
      public int anumber1
```
```
      {
```
```
          get
```
```
          {
```
```
              return num2;
```
```
          }
```
```
          set
```
```
          {
```
```
              num2 = value;
```
```
          }
```
```
      }
```
```
  }
```
```
  class Program
```
```
  {
```

      public static void Main(string[] args)

```
      {
```
```
          number p = new number();
```
```
          number k = new number();
```
```
          int m = p.anumber;
```
```
          int t = k.anumber1;
```

          int r = p.anumber * k.anumber1;

          Console.WriteLine("sum = " + r);

```
          Console.ReadLine();
```
```
      }
```
```
  }
```

a) 0
b) 120
c) 1200
d) Compile time error
View Answer

Answer: c
Explanation: None.
Output :

6. What will be the output of the following C# code?

```
 class number
```
```
 {
```
```
     int length = 50;
```
```
     public int number1
```
```
     {
```
```
         get
```
```
         {
```
```
             return length;
```
```
         }
```
```
         set
```
```
         {
```
```
             length = value;
```
```
         }
```
```
     }
```
```
 }
```
```
 class Program
```
```
 {
```

     public static void Main(string[] args)

```
     {
```
```
         number p = new number();
```
```
         p.number1 = p.number1 + 40;
```
```
         int k = p.number1 * 3 / 9;
```
```
         Console.WriteLine(k);
```
```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) 0
b) 180
c) 30
d) Compile time error
View Answer

Answer: c
Explanation: None.
Output :

7. What will be the output of the following C# code?

```
  class number
```
```
  {
```
```
      int length = 60;
```
```
      public int number1
```
```
      {
```
```
          get
```
```
          {
```
```
              return length;
```
```
          }
```
```
      }
```
```
  }
```
```
  class Program
```
```
  {
```

      public static void Main(string[] args)

```
      {
```
```
          number p = new number();
```
```
          int l;
```
```
          l = p.number1 + 40;
```
```
          int k = l * 3 / 4;
```
```
          Console.WriteLine(k);
```
```
          Console.ReadLine();
```
```
      }
```
```
  }
```

a) 30
b) 75
c) 80
d) 0
View Answer

Answer: b
Explanation: None.
Output :

8. What will be the output of the following C# code?

```
  class student
```
```
  {
```

      int []scores = new int[5] {23, 42, 54, 11, 65};

```
      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");

```
          }
```
```
      }
```
```
  }
```
```
  class Program
```
```
  {
```

      public static void Main(string[] args)

```
      {
```
```
          student s = new student();
```
```
          Console.WriteLine(s[4] + 8);
```
```
          Console.ReadLine();
```
```
      }
```
```
  }
```

a) 73
b) 37
c) 0
d) Run time error
View Answer

Answer: a
Explanation: None.
Output :

9. The correct way to implement the property for which property reports the error “invalid index” if user attempts to cross bounds of the array for a student class with 5 integer arrays.
a)

```
 class student
```
```
 {
```

     int []scores = new int[5] {23, 42, 54, 11, 65};

```
     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");

```
         }
```
```
     }
```
```
 }
```

```
 class student
```
```
 {
```

     int []scores = new int[5] {23, 42, 54, 11, 65};

```
     public int this[int index]
```
```
     {
```
```
         get
```
```
         {
```
```
             if (index < 5)
```
```
             return scores[index];
```
```
         }
```
```
     }
```
```
 }
```

```
 class student
```
```
 {
```

     int []scores = new int[5]{23, 42, 54, 11, 65};

```
     public int this[int index]
```
```
     {
```
```
         set
```
```
         {
```
```
             if (index < 5)
```
```
             return scores[index];
```
```
             else
```
```
             {
```

                 Console.WriteLine("invalid index");

```
                 return 0;
```
```
             }
```
```
         }
```
```
     }
```
```
 }
```

d) None of the mentioned
View Answer

Answer: a
Explanation: None.

10. What will be the output of the following C# code?

```
 class student
```
```
 {
```

     int []scores = new int[3] {13, 32, 24};

```
     public int this[int index]
```
```
     {
```
```
         get
```
```
         {
```
```
             if (index < 3)
```
```
             return scores[index];
```
```
             else
```
```
             {
```

                 Console.WriteLine("invalid index");

```
                 return 0;
```
```
             }
```
```
         }
```
```
         private  set
```
```
         {
```
```
             if (index < 3)
```
```
             scores[index] = value;
```
```
             else
```

             Console.WriteLine("invalid index");

```
         }
```
```
     }
```
```
 }
```
```
 class Program
```
```
 {
```

     public static void Main(string[] args)

```
     {
```
```
         student s = new student();
```

         int[] scores1 = new int[3] {8, 19, 40};

```
         for (int i = 0; i < 3; i++)
```
```
         {
```
```
             if (scores1[i] > s[i])
```
```
             {
```

                 Console.WriteLine(" scores1 had greater value :" + scores1[i]);

```
             }
```
```
             else
```
```
             {
```

                 Console.WriteLine("scores had greater value :" + s[i]);

```
             }
```
```
         }
```
```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) 0
b) Compile time error
c) Run time error
d)

scores had greater value : 13
scores had greater value : 32
scores1 had greater value : 40

View Answer

Answer: d
Explanation: None.
Output :

        scores had greater value : 13
         scores had greater value : 32
        scores1 had greater value : 40

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