C# Programming Questions and Answers

Showing 161 - 170 of 174 questions

161

Select the objects of the class TextWriter which is/are used to perform the write operations to the console?

Write()

WriteLine()

WriteError()

All of the mentioned

correct answer a,b

TextWriter is a class with objects as write() and writeline().

162

Which of the following statement is correct?

reverse() method reverses all characters.

reverseall() method reverses all characters.

replace() method replaces all instances of a character with new character.

replace() method replaces first occurrence of a character in invoking string with another character

correct answer a,c

reverse() and replace() are by definition.

163

Select the method used to write single byte to a file?

Write()

Wrteline()

WriteByte()

All of the mentioned

correct answer c

To write a byte to a file, the WriteByte( ) method is used. Its simplest form is shown here:
void WriteByte(byte value)

164

Choose the correct statement about the WriteLine()?

Can display one or more value to the screen

Adds a newline character at the end of the each new output

Allows to output data in as many different formats

None of the mentioned

correct answer a,b,c

By the definition of writeline().

165

What would be the output of given code snippet?

staticvoid Main(string[] args)

{

String a ="i love iostream";

Console.WriteLine(a.IndexOf('i')+" "+ a.IndexOf('e')+" "+ a.LastIndexOf('i')+" "+ a.LastIndexOf('e'));

Console.ReadLine();

}

0 6 7 8

0 5 7 9

5 9 0 7

0 5 7 12

correct answer d

indexof(‘i’) and lastIndexof(‘i’) are pre defined functions which are used to get the index of first and last occurrence of the character pointed by i in the given array.
Output : 0 5 7 12

166

Select the namespace/namespaces which consists of methods like Length(), Indexer(), Append() for manipulating the strings.

System.Class

System.Array

System.Text

None of the mentioned

correct answer c

The system.text namespace contains the Stringbuilder class and hence must include using system.text for manipulating the mutable strings.

167

What will be the output of given code snippet?

staticvoid Main(string[] args)

{

string h ="i lovelife";

string h1 =newstring(h.Reverse().ToArray());

Console.WriteLine(h1);

Console.ReadLine();

}

efil evoli

lifelove i

efilevol i

efil evol i

correct answer c

Reverse() an inbuilt method reverses all the characters singly and hence embed them into the string completely.
Output :efilevol i

168

What will be the output of given code snippet?

staticvoid Main(string[] args)

{

StringBuilder sb =new StringBuilder("hello world");

sb.Insert(6, "good");

Console.WriteLine(sb);

Console.ReadLine();

}

hello 6world

hello good world

hello goodworld

hello good world

correct answer c

The insert() method inserts one string into another. It is overloaded to accept values of all simple types, plus String and Objects. String is inserted into invoking object at specified position. “Good ” is inserted in “Hello World” index 6 giving “Hello Good World”.

169

Which of these classes is used to create an object whose character sequence is mutable?

String()

StringBuilder()

Both of the mentioned

None of the mentioned

correct answer b

Mutable strings are dynamic strings. They can grow dynamically as characters are added to them. stringbuilder class supports those methods that are useful for manipulating dynamic strings.

170

Which of these method returns a smallest whole number greater than or equal to variable X?

double Ciel(double X)

double Floor(double X)

double Max(double X)

double Min(double X)

correct answer a

Ciel(double X) returns the smallest whole number greater than or equal to variable X.

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