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View Compilation Error

0_0_39663966_10573.cpp: In function 'int main()':
0_0_39663966_10573.cpp:19:40: error: cannot convert 'Rule' to 'int (*)(const void*, const void*)'
   19 |                 qsort(a,n,sizeof(a[0]),Rule());
      |                                        ^~~~~~
      |                                        |
      |                                        Rule
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/cstdlib:79,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ext/string_conversions.h:43,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/basic_string.h:4108,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/string:54,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/locale_classes.h:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/ios_base.h:41,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ios:44,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/ostream:40,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/iostream:41,
                 from 0_0_39663966_10573.cpp:1:
gcc-13.1.0/x86_64-w64-mingw32/include/stdlib.h:441:93: note:   initializing argument 4 of 'void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'
  441 |   void __cdecl qsort(void *_Base,size_t _NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(const void *,const void *));
      |                                                                               ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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