Is float d=6; correct in java?

Answer 1

yes , thats correct
//as there will be no loss in precision of value
//but in case of double to float there is loss of precision
//loss of precision when higher datatyoe to lower datatype
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Answer 2

Absolutely, the compiler automatically converts 6 to 6.0, which is then a floating-point number!

You can use System.out.print(d); for a better understanding ;)