C# OOP Test - 3 - Sanfoundry

1. Which among the following differentiates enum in C#.NET from enum in C language?

All of the mentioned

None of the mentioned

In C, language variables of enum types can be used interchangeably with integers using type casts while enum variables cannot be used as a normal integers in C#.NET

C is strictly a typed language, C#.NET also is a strictly typed language

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

An enum variable can be defined inside a class or a namespace

An enum variable cannot have a protected access modifier

An enum variable cannot have a private access modifier

An enum variable cannot have a public access modifier

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

Values of the enum elements cannot be populated from database

An enumerator has a white space in its name

The value of each successive enumerator is decreased by 1

By default the first enumerator has a value equal to the number of elements present in the list

4. Which among the following cannot be used as a datatype for an enum in C#.NET?

double

all of the mentioned

short

int

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

enum days:int
{
    sunday = -3,
    monday,
    tuesday
}
Console.WriteLine((int)days.sunday);
Console.WriteLine((int)days.monday);
Console.WriteLine((int)days.tuesday);

-3 0 1

sunday monday tuesday

0 1 2

-3 -2 -1

6. Wrong statement about enum used in C#.NET is?

An enum can have Single and Double values

An object cannot be assigned to an enum variable

An enum can be declared outside a class

An enum can be declared inside a class

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

  enum per
 {
     a, 
     b, 
     c, 
     d, 
 }
 per.a = 10;
 Console.writeline(per.b);

compile time error

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

enum color:int
{
    red,
    green,
    blue = 5,
    cyan,
    pink = 10,
    brown
}
console.writeline((int)color.green);
console.writeline((int)color.brown);

1 5

2 10

1 11

2 11

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

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

When the valid range of byte exceeds, the compiler will report an error

enum must always be of int type

enum elements should always take successive values

byte value cannot be assigned to enum elements

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

enum letters
{
    a,
    b,
    c
} 
letters l;
l = letters.a;
Console.writeline(l);

letters.a

-1

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

 enum colors
 {
     red,
     black,
     pink
 }
 colors s = colors.black;
 type t;
 t = c.GetType();
 string[] str;
 str = Enum.GetNames(t);
 Console.WriteLine(str[0]);

black

red