Write the generic expression using string manipulation to extract the month information of a date of birth (DOB) from the following string:String strDOB = "My date of birth is 15/12/2008 (DD/MM/YYYY)";String month = strDOB.Substring( ____________ ) ;

Question

BlackTom AI · Accepted Answer

The task asks for the generic expression using string manipulation to extract the month information from a given DOB string. First, I will restate the key parts of the problem: the string is
My date of birth is 15/12/2008 (DD/MM/YYYY)
and the goal is to obtain the month portion as a substring, assigned to the variable month via:
String month = strDOB.Substring( ____________ ) ;

Next, since there are no answer options provided in this case, I will analyze how to determine the correct indices to extract the month.

- Step 1: Identify the month within the date portion. The date inside the string appears as 15/12/2008. The month here is the two digits 12, located between the day (15) and the year (2008), separated by slashes.
- Step 2: Determine the starting index for the month in the full string. Counting from the start of the string (0-based indexing in C#):
  - "My date of birth is " takes up characters up to index 19 (the space after is at index 19, and 0-based indexing counts from 0).
  - The date portion begins at index 20 with the character '1' of 15/12/2008.
  - The sequence for the date is: '1'(20), '5'(21), '/'(22), '1'(23), '2'(24), '/'(25), '2'(26), '0'(27), '0'(28), '8'(29), and so on.
  - The month digits '12' start at index 23 and occupy two characters (indices 23 and 24).

- Step 3: Decide which Substring overload to use. To extract exactly the two-digit month, you can use Substring with a start index and a length: Substring(startIndex, length). Since the month starts at index 23 and has length 2, one correct form is Substring(23, 2).

- Step 4: Consider alternative forms. If you were to use the single-argument overload Substring(startIndex), you would have to know the end position, which is not fixed unless you also search for delimiters. Using Substring(23, 2) is straightforward and robust for this fixed format (DD/MM/YYYY).

- Step 5: Validate the outcome conceptually. Substring(23, 2) on the full string would yield the substring consisting of characters at indices 23 and 24, which are '1' and '2' respectively, producing "12" as the month, which matches the expected two-digit month value for the given date format DD/MM/YYYY.

Note on the provided answer placeholder. If you see an input like '18, 2' inside the placeholder, that would imply a start index of 18 with length 2, which would not yield the correct month for this string (it would produce characters starting at the 19th character, not the '12' portion).

In summary, for this particular string and the goal of extracting the month as a two-character string, a suitable expression is Substring(23, 2). If you must adapt to different strings with the same DD/MM/YYYY format, you may locate the second and third slashes or split on '/' and take the second element, but the direct fixed indices approach works cleanly here.

Write the generic expression using string manipulation to extract the month information of a date of birth (DOB) from the following string:String strDOB = "My date of birth is 15/12/2008 (DD/MM/YYYY)";String month = strDOB.Substring( ____________ ) ;

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