Compilare: user.cpp: In function ‘int number()’: user.cpp:16:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='-') ^ user.cpp:20:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ans=ans*(s[i]-'0')*10+ans*(s[i+1]-'0'); ^ user.cpp:25:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] ans=ans*(s[i]-'0'); ^ user.cpp: In function ‘int sum_max()’: user.cpp:36:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(i<n && s[i]!=')') ^ user.cpp:38:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] switch(s[i]) ^ user.cpp: In function ‘int nth()’: user.cpp:66:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(i<n && s[i]!=']') ^ user.cpp:68:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] switch(s[i]) ^ user.cpp: In function ‘int sum()’: user.cpp:96:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] switch(s[i]) ^ user.cpp: In function ‘int main()’: user.cpp:126:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]<='9' && s[i]>='0') ^ user.cpp:126:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]<='9' && s[i]>='0') ^