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Strings (C# Programming) Question and Answers-Page first

Strings problems


  • 1. Which of the following will be the correct output for the C#.NET code snippet given below?

    String s1 = "Five Star";
    String s2 = "FIVE STAR";
    int c;
    c = s1.CompareTo(s2);
    Console.WriteLine(c);

  • Options
  • A. 0
  • B. 1
  • C. 2
  • D. -1
  • E. -2
  • Discuss
  • 2. Which of the following statements are true about the C#.NET code snippet given below?

    String s1, s2; 
    s1 = "Hi"; 
    s2 = "Hi";
    1. String objects cannot be created without using new.
    2. Only one object will get created.
    3. s1 and s2 both will refer to the same object.
    4. Two objects will get created, one pointed to by s1 and another pointed to by s2.
    5. s1 and s2 are references to the same object.

  • Options
  • A. 1, 2, 4
  • B. 2, 3, 5
  • C. 3, 4
  • D. 2, 5
  • Discuss
  • 3. Which of the following will be the correct output for the C#.NET code snippet given below?

    String s1 = "Nagpur";
    String s2;
    s2 = s1.Insert(6, "Mumbai"); 
    Console.WriteLine(s2);

  • Options
  • A. NagpuMumbair
  • B. Nagpur Mumbai
  • C. Mumbai
  • D. Nagpur
  • E. NagpurMumbai
  • Discuss
  • 4. Which of the following is correct way to convert a String to an int?

    1. String s = "123"; 
      int i;
      i = (int)s;
    2. String s = "123";
      int i;
      i = int.Parse(s);
    3. String s = "123"; 
      int i;
      i = Int32.Parse(s);
    4. String s = "123"; 
      int i;
      i = Convert.ToInt32(s);
    5. String s = "123"; 
      int i;
      i = CInt(s);

  • Options
  • A. 1, 3, 5
  • B. 2, 4
  • C. 3, 5
  • D. 2, 3, 4
  • Discuss
  • 5. If s1 and s2 are references to two strings, then which of the following is the correct way to compare the two references?

  • Options
  • A. s1 is s2
  • B. s1 = s2
  • C. s1 == s2
  • D. strcmp(s1, s2)
  • E. s1.Equals(s2)
  • Discuss
  • 6. The string built using the String class are immutable (unchangeable), whereas, the ones built- using the StringBuilder class are mutable.

  • Options
  • A. True
  • B. False
  • Discuss
  • 7. Which of the following statements about a String is correct?

  • Options
  • A. A String is created on the stack.
  • B. Whether a String is created on the stack or the heap depends on the length of the String.
  • C. A String is a primitive.
  • D. A String can be created by using the statement String s1 = new String;
  • E. A String is created on the heap.
  • Discuss
  • 8. Which of the following statements are correct about the String Class in C#.NET?

    1. Two strings can be concatenated by using an expression of the form s3 = s1 + s2;
    2. String is a primitive in C#.NET.
    3. A string built using StringBuilder Class is Mutable.
    4. A string built using String Class is Immutable.
    5. Two strings can be concatenated by using an expression of the form s3 = s1&s2;

  • Options
  • A. 1, 2, 5
  • B. 2, 4
  • C. 1, 3, 4
  • D. 3, 5
  • Discuss
  • 9. If s1 and s2 are references to two strings then which of the following are the correct ways to find whether the contents of the two strings are equal?

    1. if(s1 = s2)
    2. if(s1 == s2)
    3. int c;
      c = s1.CompareTo(s2);
    4. if( strcmp(s1, s2) )
    5. if (s1 is s2)

  • Options
  • A. 1, 2
  • B. 2, 3
  • C. 4, 5
  • D. 3, 5
  • Discuss
  • 10. Which of the following statements will correctly copy the contents of one string into another?

  • Options
  • A.
    String s1 = "String";
    String s2; 
    s2 = s1;
  • B.
    String s1 = "String" ; 
    String s2;
    s2 = String.Concat(s1, s2);
  • C.
    String s1 = "String"; 
    String s2;
    s2 = String.Copy(s1);
  • D.
    String s1 = "String"; 
    String s2;
    s2 = s1.Replace();
  • E.
    String s1 = "String"; 
    String s2;
    s2 = s2.StringCopy(s1);
  • Discuss

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