Eroare de compilare: user.cpp:1: error: expected constructor, destructor, or type conversion before ‘<’ token user.cpp:3: error: ‘ifstream’ does not name a type user.cpp:4: error: ‘ofstream’ does not name a type user.cpp: In function ‘int nr_zer(int)’: user.cpp:8: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:15: error: ‘in’ was not declared in this scope user.cpp:24: error: ‘out’ was not declared in this scope user.cpp:25: error: ‘out’ was not declared in this scope