Compilare: user.cpp: In function ‘void eval()’: user.cpp:92:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(semn[crt]!='(' && ord[c]<ord[semn[crt]]) ^ user.cpp:92:57: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(semn[crt]!='(' && ord[c]<ord[semn[crt]]) ^ user.cpp: In function ‘int main()’: user.cpp:144:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.in","r",stdin); ^ user.cpp:145:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.out","w",stdout); ^ user.cpp:146:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:150:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:151:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(modif); ^ /tmp/ccUg2x6Y.o: In function `main': user.cpp:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.