C# Questions & Answers - String Formatting Operations - 2

This set of C# Interview Questions and Answers focuses on “String Formatting Operations – 2”.

1. Which of these methods of class String is used to extract a substring from a String object?
a) substring()
b) Substring()
c) SubString()
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

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

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    {
```
```
        String s1 = "one";
```

        String s2 = string.Concat(s1 + " " + "two");

```
        Console.WriteLine(s2);
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) one
b) two
c) one two
d) two one
View Answer

Answer: c
Explanation: Two strings can be concatenated using Concat() method.
Output:

one two

3. Which of these methods of class String is used to remove leading and trailing whitespaces?
a) startsWith()
b) TrimEnd()
c) Trim()
d) TrimStart()
View Answer

Answer: c
Explanation: Removes white space from the string.

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

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    {
```
```
        String c = "  Hello World  ";
```
```
        String s = c.Trim();
```
```
        Console.WriteLine("""+s+""");
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) ” Hello World ”
b) “HelloWorld”
c) “Hello World”
d) “Hello”
View Answer

Answer: c
Explanation: Trim() method is used to remove leading and trailing whitespaces in a string.
Output:

"Hello World"

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

```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         String s1 = "CSHARP";
```

         String s2 = s1.Replace('H','L');

```
         Console.WriteLine(s2);
```
```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) CSHAP
b) CSHP
c) CSLARP
d) CSHALP
View Answer

Answer: c
Explanation: Replace() method replaces all occurrences of a single character in invoking strings with another character. s1.Replace(‘H’,’L’) replaces every occurrence of ‘H’ in CSHARP by ‘L’, giving CSLARP.
Output:

CSLARP

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

```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         String s1 = "Hello World";
```

         String s2 = s1.Substring(0, 4);

```
         Console.WriteLine(s2);
```
```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) Hello
b) Hell
c) H
d) Hello World
View Answer

Answer: b
Explanation: None.
Output:

Hell

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

```
 class Program
```
```
 {
```
```
     static void Main(string[] args)
```
```
     {
```
```
         String s = "Hello World";
```
```
         int i = s.IndexOf('o');
```
```
         int j = s.LastIndexOf('l');
```

         Console.WriteLine(i + " " + j);

```
         Console.ReadLine();
```
```
     }
```
```
 }
```

a) 9 5
b) 4 9
c) 9 0
d) 9 4
View Answer

Answer: b
Explanation: None.
Output:

4 9

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

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    { 
```
```
        String c = "i love Csharp";
```
```
        bool a;
```
```
        a = c.StartsWith("I");
```
```
        Console.WriteLine(a);
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) true
b) false
c) 0
d) 1
View Answer

Answer: b
Explanation: StartsWith() method is case sensitive “i” and “I” are treated differently, hence false is stored in a.
Output:

false

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

```
class Program
```
```
{
```
```
    static void Main(string[] args)
```
```
    { 
```

        String []chars = {"z", "x", "y", "z", "y"};

        for (int i = 0; i < chars.Length; ++i)

        for (int j = i + 1; j < chars.Length; ++j)

        if(chars[i].CompareTo(chars[j]) == 0)

```
        Console.WriteLine(chars[j]);
```
```
        Console.ReadLine();
```
```
    }
```
```
}
```

a) zx
b) xy
c) zy
d) yz
View Answer

Answer: c
Explanation: compareTo() function returns zero when both the strings are equal. It returns a value less than zero if the invoking string is less than the other string being compared and a value greater than zero if the invoking string is greater than the string compared to 4
Output:

zy

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

```
 static void main(String args[])
```
```
 {
```
```
     char chars[] = {'a', 'b', 'c'};
```
```
     String s = new String(chars);
```
```
     Console.WriteLine(s);
```
```
 }
```

a) a
b) b
c) ab
d) abc
View Answer

Answer: d
Explanation: None.
Output:

abc

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

```
 static void Main(string[] args)
```
```
 {
```
```
     string s = " i love you";
```

     Console.WriteLine(s.IndexOf('l') + "  " + s.lastIndexOf('o') + "  " + s.IndexOf('e'));

```
     Console.ReadLine();
```
```
 }
```

a) 3 5 7
b) 4 5 6
c) 3 9 6
d) 2 4 6
View Answer

Answer: c
Explanation: indexof(‘l’) and lastIndexof(‘o’) are pre-defined function which are used to get the index of first and last occurrence of the character pointed by l and c respectively in the given array.
Output:

3, 9, 6

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