Exercise: Classes And Objects

Questions for: Classes And Objects

Which of the following statements is correct about the C#.NET code snippet given below?
int i;
int j = new int();
i = 10;
j = 20; 
String str; 
str = i.ToString(); 
str = j.ToString();
A:
This is a perfectly workable code snippet.
B:
Since int is a primitive, we cannot use new with it.
C:
Since an int is a primitive, we cannot call the method ToString() using it.
D:
i will get created on stack, whereas j will get created on heap.
Answer: A
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Which of the following statements are correct about the C#.NET code snippet given below?
sample c;
c = new sample();
  1. It will create an object called sample.
  2. It will create a nameless object of the type sample.
  3. It will create an object of the type sample on the stack.
  4. It will create a reference c on the stack and an object of the type sample on the heap.
  5. It will create an object of the type sample either on the heap or on the stack depending on the size of the object.
A:
1, 3
B:
2, 4
C:
3, 5
D:
4, 5
Answer: B
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Which of the following statements is correct about the C#.NET code snippet given below?
namespace ExamAdept
{ 
    class Sample
    { 
        public int index; 
        public int[] arr = new int[10]; 
        
        public void fun(int i, int val)
        { 
            arr[i] = val;
        }
    }
     
    class MyProgram
    { 
        static void Main(string[] args)
        {
            Sample s = new Sample(); 
            s.index = 20; 
            Sample.fun(1, 5); 
            s.fun(1, 5); 
        } 
    } 
}
A:
s.index = 20 will report an error since index is public.
B:
The call s.fun(1, 5) will work correctly.
C:
Sample.fun(1, 5) will set a value 5 in arr[ 1 ].
D:
The call Sample.fun(1, 5) cannot work since fun() is not a shared function.
Answer: B
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Which of the following statements are correct?
  1. Data members ofa class are by default public.
  2. Data members of a class are by default private.
  3. Member functions of a class are by default public.
  4. A private function of a class can access a public function within the same class.
  5. Member function of a class are by default private.
A:
1, 3, 5
B:
1, 4
C:
2, 4, 5
D:
1, 2, 3
Answer: C
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The this reference gets created when a member function (non-shared) of a class is called.
A:
True
B:
False
C:
D:
Answer: A
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