Compilare: user.cpp: In function ‘int main()’: user.cpp:84:40: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" read", x, 0); ^ user.cpp:86:40: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" push", 1, x); ^ user.cpp:92:43: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" pop", 2, 0); ^ user.cpp:93:45: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" write", x, 0); ^ user.cpp:98:47: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" pop", 1, 0); ^ user.cpp:100:48: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" push", 2, x); ^ user.cpp:104:43: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" pop", 1, 0); ^ user.cpp:105:45: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] add_to_output(" write", x, 0); ^ user.cpp:71:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("queue.in", "r", stdin); ^ user.cpp:72:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("queue.out", "w", stdout); ^ user.cpp:77:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:79:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", cmd); ^