constructors csharp-programming question and answers -Page first

CuriousTab

Constructors problems

1. What will be the output of the C#.NET code snippet given below?

namespace CuriousTabConsoleApplication
{
    class Sample
    { 
        public static void fun1()
        { 
            Console.WriteLine("CuriousTab1 method");
        }
        public void fun2()
        { 
            fun1(); 
            Console.WriteLine("CuriousTab2 method");
        }
        public void fun2(int i)
        { 
            Console.WriteLine(i);
            fun2(); 
        } 
    } 
    class MyProgram
    { 
        static void Main(string[ ] args)
        { 
            Sample s = new Sample(); 
            Sample.fun1(); 
            s.fun2(123);
        } 
    } 
}

Options

Tab1 method 
123
Tabl method 
Tab2 method

B.
```
Tab1 method 
123
Tab2 method
```

Tab2 method 
123
Tab2 method 
Tabl method

D.
```
Tabl method
123
```
E.
```
Tab2 method 
123
Tabl method
```

Discuss

Correct Answer:

Tab1 method 
123
Tabl method 
Tab2 method

2. What will be the output of the C#.NET code snippet given below?

namespace CuriousTabConsoleApplication
{ 
    class Sample
    { 
        static Sample()
        { 
            Console.Write("Sample class ");
        }
        public static void CuriousTab1()
        { 
            Console.Write("CuriousTab1 method ");
        } 
    } 
    class MyProgram
    { 
        static void Main(string[ ] args)
        { 
            Sample.CuriousTab1();
        } 
    } 
}

Discuss

4. Which of the following is the correct way to define the constructor(s) of the Sample class if we are to create objects as per the C#.NET code snippet given below?
```
Sample s1 = new Sample(); 
Sample s2 = new Sample(9, 5.6f);
```
Options

public Sample()
{
    i = 0; 
    j = 0.0f;
}
public Sample (int ii, Single jj)
{
    i = ii;
    j = jj;
}

public Sample (Optional int ii = 0, Optional Single jj = 0.0f)
{
    i = ii;
    j = jj;
}

public Sample (int ii, Single jj)
{
    i = ii;
    j = jj;
}

D.
```
Sample s;
```
E.
```
s = new Sample();
```

Discuss

Correct Answer:

public Sample()
{
    i = 0; 
    j = 0.0f;
}
public Sample (int ii, Single jj)
{
    i = ii;
    j = jj;
}

5. Which of the following ways to create an object of the Sample class given below will work correctly?

class Sample
{
    int i;
    Single j;
    double k;
    public Sample (int ii, Single jj, double kk)
    {
        i = ii;
        j = jj;
        k = kk;
    } 
}

Options
A. Sample s1 = new Sample();
B. Sample s1 = new Sample(10);
C. Sample s2 = new Sample(10, 1.2f);
D. Sample s3 = new Sample(10, 1.2f, 2.4);
E. Sample s1 = new Sample(, , 2.5);

Discuss

6. Which of the following statements is correct about constructors?
Options
A. If we provide a one-argument constructor then the compiler still provides a zero-argument constructor.
B. Static constructors can use optional arguments.
C. Overloaded constructors cannot use optional arguments.
D. If we do not provide a constructor, then the compiler provides a zero-argument constructor.

Discuss

8. In which of the following should the methods of a class differ if they are to be treated as overloaded methods?
1. Type of arguments
2. Return type of methods
3. Number of arguments
4. Names of methods
5. Order of arguments
Options
A. 2, 4
B. 3, 5
C. 1, 3, 5
D. 3, 4, 5

Discuss

9. Which of the following statements are correct about static functions?
Options
A. Static functions are invoked using objects of a class.
B. Static functions can access static data as well as instance data.
C. Static functions are outside the class scope.
D. Static functions are invoked using class.

Discuss

10. Which of the following statements are correct about the C#.NET code snippet given below?

class Sample
{
    static int i;
    int j;
    public void proc1()
    {
        i = 11; 
        j = 22;
    }
    public static void proc2()
    {
        i = 1;
        j = 2;
    }
    static Sample()
    {
        i = 0; 
        j = 0;
    }
}

Options
A. i cannot be initialized in proc1().
B. proc1() can initialize i as well as j.
C. j can be initialized in proc2().
D. The constructor can never be declared as static.
E. proc2() can initialize i as well as j.

Discuss

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