fagure.cpp:3: 'ifstream' is used as a type, but is not defined as a type. fagure.cpp:4: 'ofstream' is used as a type, but is not defined as a type. fagure.cpp: In function `int main()': fagure.cpp:14: `f' undeclared (first use this function) fagure.cpp:14: (Each undeclared identifier is reported only once for each function it appears in.) fagure.cpp:19: `g' undeclared (first use this function) fagure.cpp:13: warning: unused variable `int grupa' fagure.cpp:13: warning: unused variable `int nr'