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Excuse me, Java experts, what is the default type of Java values?

Common data types: integer, floating point

byte 1(2^8) -128 ~ +127 bytes

short 2(2^ 16) -32768 ~ +32767 Short integer type

int 4(2^32) Integer type

long 8(2^64) Long integer type

float 4 different digits of significant digits 7 single precision floating point numbers

double 8 different digits of significant digits 15 double precision floating point numbers

For the first question: You can type the following code:

p>

int a = 12;

byte b = a;

System.out.println(b);

Error: Type mismatch: cannot convert from int to byte: Type matching error

Failed to convert int to byte

Second question:

floate f=12.4; //Error when converting double to float

Maybe you wrote it wrong: it should be: float f=12.4f;

Usually f should be added when defining floating point data

All decimals For numbers, it is double type data by default

For the third question:

Double precision: 64 bits, its range is: -

1.79769313486231570E+ 308~~1.79769313486231570E+308 The default value is: 0.0d

As for why no error is reported, it may be due to the computing performance of the computer itself, and it can now be displayed using scientific notation, specifically how many digits there are. How much is it, I can’t solve it