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example if i input : #alslsl

It would print invalid as it cannot start with the # symbol, % symbol and numbers.

I only want to know how to detect the errors of the identifier so that i can create the coding and the produce the "The data contains identifier error".

I only manage to get to the successful data...

I had just started learning java and i totally have no experience in programming before.

So my lecturer asked the whole class to create a coding to detect identifier problems.

The question is:...