1. What will be the output of the following C# code?
public static void Main(string[] args)
{
p();
void p()
{
Console.WriteLine("hi");
}
}
a)Compile time error
b) hi
c) hi infinite times
d) None of the mentioned
Explanation: Invalid definition of function p() inside main().
2. Which operator among the following signifies the destructor operator?
a) ::
b) :
c) ~
d) &
Explanation: ~ operator
3.Name a method which has the same name as that of class and which is used to destroy objects also called automatically when application is finally on process of being getting terminated.
a) Constructor
b) Finalize()
c) Destructor
d) End
Explanation: Destructor
4. Which of the following statements are correct?
a) There is one garbage collector per program running in memory
b) There is one common garbage collector for all programs
c) To garbage collect an object set all references to it as null
d) Both There is one common garbage collector for all programs & To garbage collect an object set all references to it as null
Explanation: Both There is one common garbage collector for all programs & To garbage collect an object set all references to it as null
5. Operator used to free the memory when memory is allocated?
a) new
b) free
c) delete
d) none of the mentioned
Explanation: ‘New’ is used to allocate memory in the constructors. Hence, we should use ‘delete’ to free that memory.
6. Select wrong statement about destructor in C#?
a) A class can have one destructor only
b) Destructors cannot be inherited or overloaded
c) Destructors can have modifiers or parameters
d) All of the mentioned
Explanation: Destructors can have modifiers or parameters
7. What will be the output of the following C# code?
class sample
{
int i;
double k;
public sample (int ii, double kk)
{
i = ii;
k = kk;
double j = (i) + (k);
Console.WriteLine(j);
}
~sample()
{
double j = i - k;
Console.WriteLine(j);
}
}
class Program
{
static void Main(string[] args)
{
sample s = new sample(8, 2.5);
Console.ReadLine();
}
}
a) 0 0
b) 10.5 0
c) Compile time error
d) 10.5 5.5
Explanation: First constructor ‘sample’ is called and hence then destructor ‘~sample’ is evaluated.
Output :
10.5, 5.5
8. What is the return type of destructor?
a) int
b) void
c) float
d) none of the mentioned
Explanation: Destructors do not have any return type not even void.
9. What will be the output of the following C# code?
class box
{
public int volume;
int width;
int height;
int length;
public box ( int w, int h, int l)
{
width = w;
height = h;
length = l;
}
public ~box()
{
volume = width * length * height;
}
}
class Program
{
static void Main(string[] args)
{
box b = new box(4, 5, 9);
Console.WriteLine(b.volume);
Console.ReadLine();
}
}
a) 0
b) 180
c) Compile time error
d) None of the mentioned
Explanation: We cannot use any kind of modifier with destructor.
10. What will be the output of the following C# code?
class box
{
public int volume;
int width;
int height;
int length;
public box ( int w, int h, int l)
{
this.width = w;
this.height = h;
this.length = l;
}
~ box()
{
volume = this.width * this.length * this.height;
console.writeline(volume);
}
}
class Program
{
public static void Main(string[] args)
{
box b = new box(4, 5, 9);
Console.ReadLine();
}
}
a) 0
b) Code executes successfully but prints nothing
c) Compile time error
d) 180
Explanation:
Output:
180.