View Compilation Error

0_0_13504620_19533.cpp: In function 'void div(int, int)':
0_0_13504620_19533.cpp:35:22: error: ambiguating new declaration of 'void div(int, int)'
 void div(int n,int op)
                      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cstdlib:72:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ext/string_conversions.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2850,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 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_13504620_19533.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:358:17: note: old declaration 'div_t div(int, int)'
   div_t __cdecl div(int _Numerator,int _Denominator);
                 ^