What is valid value range for char?

A char supports a 16-bit unicode character and is unsigned 2 byte integer. It can be assigned directly to an integer value but the integer value must be in its value range or you would get a compiler error.

The largest number it can hold is 2¹⁶ which is 65535. The following value ranges are equivalent to represent the value range of char:

0 to 216-1
dec
 


0 to 65535
dec


00 to 0177777
octal


0x0 to 0xFFFF
hex


0000 0000 0000 0000  to 1111 1111 1111 1111
binary


'\u0000' to '\uFFFF'
unicode

Any numeric assignment to a char could be cast to a char and get past the compiler in this case the char will only contain the right two bytes.