echitabil.cpp:1:20: error: fstream.h: No such file or directory echitabil.cpp:3: error: 'ifstream' does not name a type echitabil.cpp:4: error: 'ofstream' does not name a type echitabil.cpp: In function 'int main()': echitabil.cpp:7: error: 'f' was not declared in this scope echitabil.cpp:27: error: 'g' was not declared in this scope