Compilare: user.cpp: In function ‘int main()’: user.cpp:27:9: warning: unused variable ‘n1’ [-Wunused-variable] int n1,n2,i; ^ user.cpp:27:12: warning: unused variable ‘n2’ [-Wunused-variable] int n1,n2,i; ^ user.cpp:27:15: warning: unused variable ‘i’ [-Wunused-variable] int n1,n2,i; ^ user.cpp:28:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.in","r",stdin); ^ user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cezar.out","w",stdout); ^ user.cpp:30:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^