numere12.cpp:6: variable `std::ifstream f' has initializer but incomplete type numere12.cpp:7: variable `std::ofstream g' has initializer but incomplete type numere12.cpp: In function `int main()': numere12.cpp:10: `m' undeclared (first use this function) numere12.cpp:10: (Each undeclared identifier is reported only once for each function it appears in.) numere12.cpp:21: invalid types `int[int]' for array subscript numere12.cpp:22: invalid types `int[int]' for array subscript numere12.cpp: At global scope: numere12.cpp:6: storage size of `f' isn't known numere12.cpp:7: storage size of `g' isn't known