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View Compilation Error

0_0_28765800_25152.cpp: In function 'void fft(comp*, int)':
0_0_28765800_25152.cpp:57:17: error: 'change' was not declared in this scope
     change(y,len);
                 ^
0_0_28765800_25152.cpp:67:27: error: no match for 'operator*' (operand types are 'comp' and 'comp')
                 comp t = w*y[k+h/2];
                           ^
0_0_28765800_25152.cpp:68:25: error: no match for 'operator+' (operand types are 'comp' and 'comp')
                 y[k] = u+t;
                         ^
0_0_28765800_25152.cpp:68:25: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:334:5: note: template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&)
     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:334:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   'comp' is not derived from 'const std::reverse_iterator<_Iterator>'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1135:5: note: template<class _Iterator> std::move_iterator<_Iterator> std::operator+(typename std::move_iterator<_Iterator>::difference_type, const std::move_iterator<_Iterator>&)
     operator+(typename move_iterator<_Iterator>::difference_type __n,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1135:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   'comp' is not derived from 'const std::move_iterator<_Iterator>'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2384:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2384:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   'comp' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:53:0,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:692:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const _CharT* __lhs,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:692:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   mismatched types 'const _CharT*' and 'comp'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:53:0,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:708:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:708:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   'comp' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2421:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2421:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   'comp' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2437:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2437:5: note:   template argument deduction/substitution failed:
0_0_28765800_25152.cpp:68:26: note:   'comp' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
                 y[k] = u+t;
                          ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 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_28765800_25152.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2449:5: note: template<class _CharT, class _Trai


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