Question

To extract the word NOW from the word ``ACKNOWLEDGEMENT'', Java statement ``ACKNOWLEDGEMENT''.substring(3, ___ ) is used. Choose the correct number to fill in the blank.

• A. 6
• B. 7
• C. 5
• D. 8

Hint:

In Java, \texttt{substring(a,b)} includes index \texttt{a} but excludes index \texttt{b}. Always stop one position after the last character you want.

Answer 1

The Correct Option is A

Step 1: Recall how substring() works in Java.
In Java, substring(beginIndex, endIndex) starts from beginIndex and goes up to endIndex - 1.
This means the starting index is included, but the ending index is excluded.

Step 2: Write the indices of the word ACKNOWLEDGEMENT.
Let us mark the positions of the letters:

\[ \begin{array}{ccccccccccccccc} A & C & K & N & O & W & L & E & D & G & E & M & E & N & T \\ 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 \end{array} \]

We want the word NOW. This begins from:

\[ N = 3 \]

and includes:

\[ O = 4,\quad W = 5 \]

To stop after W, the ending index must be:

\[ 6 \]

because index 6 is excluded.

Step 3: Form the substring. So,

\[ \texttt{"ACKNOWLEDGEMENT".substring(3,6)} \]

will give:

\[ \texttt{"NOW"} \]

Hence, the correct number to fill in the blank is 6.

Step 4: Conclusion.
Therefore, the correct Java statement is:

\[ \texttt{"ACKNOWLEDGEMENT".substring(3,6)} \]

So, the correct answer is 6.

Final Answer: 6

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