View Compilation Error

306694_0_24779.cpp: In function `int main()':
306694_0_24779.cpp:11: error: no matching function for call to `std::bitset<15u>::to_string()'
306694_0_24779.cpp:12: error: `ostream_iterator' undeclared (first use this function)
306694_0_24779.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
306694_0_24779.cpp:12: error: expected primary-expression before "char"