Multiple choice technology programming languages

Choose the illegal identifier?

  1. int _a;
  2. int $b;

  3. int _123;

  4. int e#123;
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D Correct answer
Explanation

Java identifiers must conform to strict rules: they can contain letters, numbers, underscores, and currency symbols like the dollar sign. Special characters such as # are strictly prohibited, which makes the identifier e#123 illegal and invalid.

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