set.cpp:1: error: stray '#' in program set.cpp:1: error: expected unqualified-id before '?' token set.cpp:5: error: 'ifstream' does not name a type set.cpp:6: error: 'ofstream' does not name a type set.cpp: In function 'int main()': set.cpp:13: error: 'fin' was not declared in this scope set.cpp:22: error: 'fout' was not declared in this scope