View Compilation Error

0_0_6231534_4165.cpp: In function `int main()':
0_0_6231534_4165.cpp:11: error: no match for 'operator<' in '(+std::operator<< [with _Traits = std::char_traits<char>](((std::basic_ostream<char, std::char_traits<char> >&)(&std::cout)), ((const char*)"Case ")))->std::basic_ostream<_CharT, _Traits>::operator<< [with _CharT = char, _Traits = std::char_traits<char>]((cas++)) < ": "'
0_0_6231534_4165.cpp:11: note: candidates are: operator<(const char*, const char*) <built-in>
0_0_6231534_4165.cpp:11: note:                 operator<(void*, void*) <built-in>