[解决办法] MD，cstdio.h，我太有才了 [解决办法] Advice: Use the C++ Versions of C Library Headers In addition to facilities defined specifically for C++, the C++ library incorporates the C library. The cctype header makes available the C library functions defined in the C header file named ctype.h.
The standard C headers names use the form name.h. The C++ versions of these headers are named cnamethe C++ versions remove the .h suffix and precede the name by the letter c. Thec indicates that the header originally comes from the C library. Hence, cctype has the same contents as ctype.h, but in a form that is appropriate for C++ programs. In particular, the names defined in the cname headers are defined inside the std namespace, whereas those defined in the .h versions are not.
Ordinarily, C++ programs should use the cname versions of headers and not the name.h versions. That way names from the standard library are consistently found in the std namespace. Using the .h headers puts the burden on the programmer to remember which library names are inherited from C and which are unique to C++.
