Compilare: user.cpp: In function ‘int main()’: user.cpp:57:9: warning: unused variable ‘d’ [-Wunused-variable] int d, s; ^ user.cpp:57:12: warning: unused variable ‘s’ [-Wunused-variable] int d, s; ^ user.cpp: In function ‘int rec(int, int, int, int)’: user.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:54:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.in","r",stdin); ^ user.cpp:55:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractal.out","w",stdout); ^ user.cpp:59:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&k,&x,&y); ^