View Compilation Error

233295_0_30674.cpp: In function `int main()':
233295_0_30674.cpp:17: error: no match for 'operator==' in 's == 'a''
233295_0_30674.cpp:17: error: no match for 'operator==' in 's == 'e''
233295_0_30674.cpp:17: error: no match for 'operator==' in 's == 'i''
233295_0_30674.cpp:17: error: no match for 'operator==' in 's == 'o''
233295_0_30674.cpp:17: error: no match for 'operator==' in 's == 'u''
233295_0_30674.cpp:25: error: no match for 'operator==' in 's == (&s)->std::basic_string<_CharT, _Traits, _Alloc>::operator[] [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>](((unsigned int)(i + 1)))'
233295_0_30674.cpp:26: error: no match for 'operator==' in 's == 'e''
233295_0_30674.cpp:26: error: no match for 'operator==' in 's == 'o''