widechar

问题 wchar_t is defined in wchar.h Currently, if the developers want to use only wchar_t , they can not do this without getting type conversion warnings from the compiler. If wchar_t will be made the same type as wint_t , it will be good for both parties. The developers who want to have both wint_t and wchar_t in their programs (for example if they want their code to be compiled not only under glibc) can do this without getting compiler warnings. The developers who want to use only wchar_t (to

问题 I came across this in the book: wscanf(L"%lf", &variable); where the first parameter is of type of wchar_t * . This s different from scanf("%lf", &variable); where the first parameter is of type char * . So what is the difference than. I have never heard "wide character string" before. I have heard something called Raw String Literals which is printing the string as it is (no need for things like escape sequences) but that was not in C. 回答1: The exact nature of wide characters is

问题 Is there any reason why Java char primitive data type is 2 bytes unlike C which is 1 byte? Thanks 回答1: When Java was originally designed, it was anticipated that any Unicode character would fit in 2 bytes (16 bits), so char and Character were designed accordingly. In fact, a Unicode character can now require up to 4 bytes. Thus, UTF-16, the internal Java encoding, requires supplementary characters use 2 code units. Characters in the Basic Multilingual Plane (the most common ones) still use 1.