Compilare: user.cpp: In function ‘int main()’: user.cpp:7:15: warning: unused variable ‘i’ [-Wunused-variable] int x, y, i, h, f1, f20, fx, fy; ^ user.cpp:7:18: warning: unused variable ‘h’ [-Wunused-variable] int x, y, i, h, f1, f20, fx, fy; ^ user.cpp:7:21: warning: unused variable ‘f1’ [-Wunused-variable] int x, y, i, h, f1, f20, fx, fy; ^ user.cpp:7:25: warning: unused variable ‘f20’ [-Wunused-variable] int x, y, i, h, f1, f20, fx, fy; ^ user.cpp:7:30: warning: unused variable ‘fx’ [-Wunused-variable] int x, y, i, h, f1, f20, fx, fy; ^ user.cpp:7:34: warning: unused variable ‘fy’ [-Wunused-variable] int x, y, i, h, f1, f20, fx, fy; ^ user.cpp:9:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("fenrir.out", "w", stdout); ^