casting refers to implicit type conversion

coercion refers to implicit conversion

casting refers to explicit type conversion

both coercion refers to implicit conversion & casting refers to explicit type conversion

0

-1

unpredictable

none of these

an identifier may start with an underscore

an identifier may end with an underscore

IF is a valid identifier

All of the above

during external variable definition, storage is set aside by the compiler

during external variable declaration, no storage is set aside by the compiler

the use of external variables may make debugging difficult

All of the above

it is binary representation of a character in the extended binary set

it is of integer type wchar_t

end of file is represented by WEOF

All of the above