View Compilation Error

0_0_21961588_23385.cpp: In function 'int main()':
0_0_21961588_23385.cpp:33:18: error: too few arguments to function 'FILE* freopen(const char*, const char*, FILE*)'
     freopen("100")
                  ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/locale.h:12:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/clocale:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/c++locale.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/localefwd.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_21961588_23385.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:455:17: note: declared here
   FILE *__cdecl freopen(const char * __restrict__ _Filename,const char * __restrict__ _Mode,FILE * __restrict__ _File) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
                 ^