binary to float or double assignment error

Question

why assignment of binary to float or double is causing an error.

here is my first code which works well-

float myFloat1 = 0b111; //prints 7.0
double myDouble1 = 0b111; //prints 7.0

here is the second code

float myFloat2 = 0b111f; //compiler complains ';' expected
double myDouble2 = 0b111d; //compiler complains ';' expected

In the second code compilers complains that ';' expected, what's going on in second code snippet? Any help will be greatly appreciated.

Answer 1

The 0bxxx specifies an integer, but this can't be modified with d or f to convert it to a floating-point value. But you can use a cast:

float myFloat2 = (float) 0b111;
double myDouble2 = (double) 0b111;

Answer 2

Hi if you just use float x=7;

then it assumes 7 is integer and trying to assign to float so compile time error comes

so to make it work we have to do

float x=7f;

but if the number is starting with 0 in java it assumes it as Octal number

and for octal number you should not append anything like f or d. so float x=0b111; is fine instead of float x =0111f;

also remember float x=0181; is invalid because octal number should have digits only from 0 to 7 and its having one of the digit 8.