Compilare: user.cpp: In function ‘int main()’: user.cpp:29:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[505]’ [-Wformat=] scanf("%s",&s1); ^ user.cpp:31:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[505]’ [-Wformat=] scanf("%s",&s2); ^ user.cpp:27:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subsir.in","r",stdin); ^ user.cpp:28:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("subsir.out","w",stdout); ^ user.cpp:29:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s1); ^ user.cpp:30:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:31:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s2); ^