Compilare: user.cpp: In function ‘int eval()’: user.cpp:13:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]=='+'||s[i]=='-') ^ user.cpp:13:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]=='+'||s[i]=='-') ^ user.cpp:15:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='+') ^ user.cpp:20:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(s[i]=='-') ^ user.cpp: In function ‘int termen()’: user.cpp:33:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='*') ^ user.cpp:38:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(s[i]=='/') ^ user.cpp: In function ‘int factor()’: user.cpp:50:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='(') ^ user.cpp:58:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]>='0'&&s[i]<='9') ^ user.cpp:58:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]>='0'&&s[i]<='9') ^ user.cpp:60:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] r=r*10+s[i]-'0'; ^ user.cpp: In function ‘int main()’: user.cpp:69:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.in","r",stdin); ^ user.cpp:70:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evaluare.out","w",stdout); ^ user.cpp:71:21: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s,N,stdin); ^