src.cpp: In function 'int main()':
src.cpp:6:12: error: conflicting declaration 'std::ofstream f1'
ofstream f1("TBC.OUT");
^
src.cpp:5:11: note: previous declaration as 'std::ifstream f1'
{ifstream f1("TBC.INP");
^
src.cpp:12:5: error: 'f2' was not declared in this scope
f2<<setprecision(2)<<fixed<<s/n;
^