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View Compilation Error

0_0_21806670_20913.cpp:7:16: error: 'double nan [10010]' redeclared as different kind of symbol
 double nan[maxn],nv[maxn];
                ^
In file included from 0_0_21806670_20913.cpp:3:0:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:931:25: note: previous declaration 'double nan(const char*)'
   extern double __cdecl nan(const char *tagp);
                         ^
0_0_21806670_20913.cpp: In function 'int main()':
0_0_21806670_20913.cpp:52:33: error: invalid conversion from 'double (*)(const char*)' to 'void*' [-fpermissive]
   qsort(nan,n,sizeof(double),cmp);
                                 ^
In file included from 0_0_21806670_20913.cpp:2:0:
GCC4.9.2/x86_64-w64-mingw32/include/stdlib.h:353:16: note: initializing argument 1 of 'void qsort(void*, size_t, size_t, int (*)(const void*, const void*))'
   void __cdecl qsort(void *_Base,size_t _NumOfElements,size_t _SizeOfElements,int (__cdecl *_PtFuncCompare)(const void *,const void *));
                ^
0_0_21806670_20913.cpp:55:16: error: cannot convert 'double (*)(const char*)' to 'double*' for argument '1' to 'void h(double*, double*, int, int)'
    h(nan,nv,n,m);
                ^
0_0_21806670_20913.cpp:57:16: error: cannot convert 'double (*)(const char*)' to 'double*' for argument '2' to 'void h(double*, double*, int, int)'
    h(nv,nan,m,n);
                ^


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