Io Operations And Stream Classes(Engineering > Computer Science And Engineering > C# .net ) Questions and Answers
Question 1. Select the correct statement about Attributes used in C#.NET?
The CLR can change the behaviour of the code depending on attributes applied to it
If a bugFixAttribute is to recieve three paramteres, then the BugFixAttribute class should implement a zero arguement constructor
To create a custom attribute we need to create a custom attribute structure and derive it from System.Attribute
None of the mentioned
Explanation:-
Answer: Option A. -> The CLR can change the behaviour of the code depending on attributes applied to it
Question 2. Choose the file mode method which is used to create a new output file with the condition that the file with same name must not exist.
FileMode.CreateNew
FileMode.Create
FileMode.OpenOrCreate
FileMode.Truncate
Explanation:-
Answer: Option A. -> FileMode.CreateNew
Creates a new output file. The file must not already be existing.
Question 3. Which property among the following represents the current position of the stream?
long Length
long Position
int Length
All of the mentioned
Explanation:-
Answer: Option A. -> long Length
This property contains the length of the stream. This property is read-only.
Question 4. The correct way to apply the custom attribute called Employer which receives two arguements “ name of the employee and employeeid is?
Custom attribute can be applied to an assembly
[assembly : Employer(Ankit",employeeid.one)].
[ Employer(Ankit", employeeid.second)] class employee{}
All of the mentioned
Explanation:-
Answer: Option D. -> All of the mentioned
Question 5. Which method of character stream class returns the numbers of characters successfully read starting at count?
int Read()
int Read(char[] buffer, int index, int count)
int ReadBlock(char[ ] buffer, int index, int count)
None of the mentioned
Explanation:-
Answer: Option B. -> int Read(char[] buffer, int index, int count)
Attempts to read the count characters into buffer starting at buffer[count], returning the number of characters successfully read.
Question 6. Which method among the following returns the integer if no character is available?
int peek()
int read()
string ReadLine()
None of the mentioned
Explanation:-
Answer: Option A. -> int peek()
Obtains the next character from the input stream, but does not remove that character. Returns “1 if no character is available.
Question 7. Select the method which returns the number of bytes from the array buffer:
void WriteByte(byte value)
int Write(byte[] buffer ,int offset ,int count)
write()
None of the mentioned
Explanation:-
Answer: Option B. -> int Write(byte[] buffer ,int offset ,int count)
Writes a subrange of count bytes from the array buffer,beginning at buffer[offset], returning the number of bytes written.
Question 8. Choose the output returned when read() reads the character from the console?
String
Char
Integer
Boolean
Explanation:-
Answer: Option C. -> Integer
Read() returns the character read from the console. It returns the result. The character is returned as an int, which should be cast to char.
Question 9. What is the output returned by Console if ReadLine() stores I/O error?
1
0
False
I/O EXCEPTION ERROR
Explanation:-
Answer: Option D. -> I/O EXCEPTION ERROR
Question 10. What will be the output of given code snippet?static void Main(string[] args) { string h = "i lovelife"; string h1 = new string(h.Reverse().ToArray()); Console.WriteLine(h1); Console.ReadLine(); }
efil evoli
lifelove i
efilevol i
efil evol i
Explanation:-
Answer: Option C. -> efilevol i
Reverse() an inbuilt method reverses all the characters singly and hence embed them into the string completely. Output :efilevol i
