MCQ Single Best Answer Moderate

Q
[Strings]

For the following code snippet choose the correct output:

int x = 234;
String str = String.valueOf(x);
System.out.println(str.length());
System.out.println(x + x);
System.out.println(str + str);

ID: #24942 Competency focused Practice Questions ISC Class XII Computer Science 5 views

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#24942Q ID

ModerateDifficulty

Competency focused Practice Questions ISC Class XII Computer ScienceTopic

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A
2
234234
234234 ✔ ✖
B Error ✔ ✖
C
3
234234
468 ✔ ✖
D
3
468
234234 ✔ ✖

Correct Answer: Option D

Explanation

[Strings]

For the following code snippet choose the correct output:

int x = 234;
String str = String.valueOf(x);
System.out.println(str.length());
System.out.println(x + x);
System.out.println(str + str);

(a)
2
234234
234234

(b) Error

(d)
3
468
234234

Correct Answer: (d)

Step-by-Step Explanation:

Step 1: Integer Declaration

int x = 234;

Here, the integer variable x stores the value:

234

Step 2: Converting Integer to String

String str = String.valueOf(x);

The String.valueOf() method converts the integer into a String.

So:

str = "234"

Step 3: Finding String Length

System.out.println(str.length());

The string "234" contains:

Total characters = 3

Output: 3

Step 4: Integer Addition

System.out.println(x + x);

Since x is an integer:

234 + 234 = 468

Therefore output is:

Output: 468

Step 5: String Concatenation

System.out.println(str + str);

Here, both operands are Strings. So Java performs String Concatenation.

"234" + "234" = "234234"

Therefore output is:

Output: 234234

Final Output:

3
468
234234

Conclusion:

Therefore, the correct answer is: (d)

Statement	Result
str.length()	3
x + x	468
str + str	234234

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Q [Strings] For the following code snippet choose the correct output: int x = 234; String str = String.valueOf(x); System.out.println(str.length()); System.out.println(x + x); System.out.println(str + str);