Classes and Objects in C Sharp MCQ question and answer with solution

41

Which of the following is the correct way to settle down values into the structure variable 'e' defined in the following C# code snippet?

struct emp
{ 
    public String name;
    public int age;
    public Single sal;
}
emp e = new emp();

A)

e.name = "Jone";
e.age = 24;
e.sal = 200;

B)

With emp e
{
  .name = "Jone";
  .age = 24;
  .sal = 200;
}

C)

name = "Jone";
age = 24;
sal = 200;

D) All of the mentioned

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Answer & Solution

Answer: Option A

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42

Which of the following keyword is used to overload user defined types by defining static member functions?

A) op B) opoverload C) operator D) operatoroverload

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Answer & Solution

Answer: Option C

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43

If base class consist of two private integers, one static integer and derived class consist of two static integers and one private integer. What would be the size of derived class object?

A) size of object depends on sizes of its non static data members B) size of a derived class object is sum of sizes of non static data members of base class and derived class C) size of object is calculated using sizeof() method D) none of the mentioned

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Answer & Solution

Answer: Option A

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44

What will be the output of the following C# code snippet?

class maths 
 {
     int fact(int n) 
     {
         int result;
         if (n == 1)
         return 1;
         result = fact(n - 1) * n;
         return result;
     }
 } 
 class Output 
 {
     static void main(String args[]) 
     {
         maths obj = new maths() ;
         Console.WriteLine(obj.fact(4)*obj.fact(2));
     }
 }

A) 64 B) 60 C) 120 D) 48

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Answer & Solution

Answer: Option D

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45

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

static void Main(string[] args)
{
    Mul();
    m();
    Console.ReadLine();
}
static void Mul()
{
    Console.WriteLine("4");
}
static void m()
{
    Console.WriteLine("3");
    Mul();
}

A) 4 3 3 B) 4 4 3 C) 4 3 4 D) 3 4 4

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Answer & Solution

Answer: Option C

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46

Which among the following is the correct statement: Constructors are used to?

A) initialize the objects B) construct the data members C) initialize the objects & construct the data members D) none of the mentioned

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Answer & Solution

Answer: Option A

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47

What will be the correct statement of the following C# code?

enum color:byte
{
    yellow = 500,
    green = 1000,
    pink = 1300
}

A) byte value cannot be assigned to enum elements B) enum elements should always take successive values C) enum must always be of int type D) When the valid range of byte exceeds, the compiler will report an error

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Answer & Solution

Answer: Option D

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48

Choose the correct statement about enum used in C#.NET?

A) By default the first enumerator has a value equal to the number of elements present in the list B) Values of the enum elements cannot be populated from database C) The value of each successive enumerator is decreased by 1 D) An enumerator has a white space in its name

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Answer & Solution

Answer: Option B

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49

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

{
    struct abc
    {
        int i;
    }
    class Program
    {
        static void Main(string[] args)
        {
            abc x = new abc();
            abc z;
            x.i = 10;
            z = x;
            z.i = 15;
            console.Writeline(x.i + "  " + y.i)
        }
    }
}

A) 10 10 B) 10 15 C) 15 10 D) 15 15

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Answer & Solution

Answer: Option B

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50

What will be the output of the following C# code snippet?

class maths
{
    public int fact(int n)
    {
        int result;
        result = fact(n - 1) * n;
        return result;
    }
} 
class Program
{
    static void Main(string[] args)
    {            
        maths obj = new maths();
        Console.WriteLine(obj.fact(4));
        Console.ReadLine();
    }
}

A) 24 B) 30 C) Compile time error D) Runtime Error

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Answer & Solution

Answer: Option D

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Classes and Objects in C Sharp MCQ question and answer with solution | C# Program MCQs