Compilare: main.cpp: In function 'int calcul()': main.cpp:18:14: warning: array subscript has type 'char' [-Wchar-subscripts] while(s[i]=='+' || s[i]=='-') ^ main.cpp:18:27: warning: array subscript has type 'char' [-Wchar-subscripts] while(s[i]=='+' || s[i]=='-') ^ main.cpp:20:15: warning: array subscript has type 'char' [-Wchar-subscripts] if(s[i]=='+') ^ main.cpp: In function 'int termen()': main.cpp:39:14: warning: array subscript has type 'char' [-Wchar-subscripts] while(s[i]=='*' || s[i]=='/') ^ main.cpp:39:27: warning: array subscript has type 'char' [-Wchar-subscripts] while(s[i]=='*' || s[i]=='/') ^ main.cpp:41:15: warning: array subscript has type 'char' [-Wchar-subscripts] if(s[i]=='*') ^ main.cpp: In function 'int factor()': main.cpp:59:10: warning: array subscript has type 'char' [-Wchar-subscripts] if(s[i]=='(') ^ main.cpp:68:18: warning: array subscript has type 'char' [-Wchar-subscripts] while(s[i]>='0' && s[i]<='9') ^ main.cpp:68:31: warning: array subscript has type 'char' [-Wchar-subscripts] while(s[i]>='0' && s[i]<='9') ^ main.cpp:70:26: warning: array subscript has type 'char' [-Wchar-subscripts] nr=nr*10+(s[i]-'0'); ^