Difficulty: Hard

Average Score: 37%

Which code segment contains a conditional expression?

Rationale

var result = count > 10 ? "Done" : getResult(); contains a conditional expression.

This code segment utilizes the ternary operator, which is a shorthand for an if-else statement, thereby constituting a conditional expression that evaluates whether `count` is greater than 10.

A (var result = dataCount++ * 1000 == 3000000;) YOUR ANSWER

This code segment performs a mathematical operation followed by a comparison, resulting in a boolean value. However, it does not include a conditional expression that directs program flow based on a true or false evaluation; instead, it simply checks a condition after performing an arithmetic operation.

B (var result = count > 10 ? "Done" : getResult();) CORRECT

This segment clearly features a conditional expression, where the statement checks if `count` is greater than 10. If true, it returns "Done"; otherwise, it calls the function `getResult()`. This structure exemplifies a conditional decision-making process.

C (var result = count++ > 10;) YOUR ANSWER

While this segment evaluates whether `count` is greater than 10, it does not contain a conditional expression that alters the flow of execution or provides alternative outcomes. Instead, it simply assigns a boolean result to `result`, lacking the branching capability of a conditional expression.

D (var result = dataCount;) YOUR ANSWER

This assignment statement merely assigns the value of `dataCount` to `result` without any conditions or evaluations. It does not evaluate any expression, conditional or otherwise, and lacks the complexity of a conditional expression entirely.

Conclusion

Conditional expressions are crucial for directing code execution based on logical evaluations. The code segment with the ternary operator effectively demonstrates this by providing two possible outcomes based on the evaluation of `count`. The other options either perform calculations, evaluations, or assignments without incorporating conditional logic, highlighting the unique nature of the correct choice.

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