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View Compilation Error

0_0_17221163_527.cpp:18:8: error: 'double tan' redeclared as different kind of symbol
 double tan;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/cmath:44:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_17221163_527.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/math.h:140:18: note: previous declaration 'double tan(double)'
   double __cdecl tan(double _X);
                  ^
0_0_17221163_527.cpp: In function 'void work()':
0_0_17221163_527.cpp:28:15: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator/'
   len1=a[i].h/tan;
               ^
0_0_17221163_527.cpp:30:18: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator/'
    len2=a[i+1].h/tan;
                  ^
0_0_17221163_527.cpp: In function 'int main()':
0_0_17221163_527.cpp:54:6: error: overloaded function with no contextual type information
   tan=xx*1.0/hh;
      ^


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