Compilare: user.cpp: In function ‘str suma(str, str)’: user.cpp:15:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(t){acr.v[0]++;acr.v[acr.v[0]]=t;} ^ user.cpp: In function ‘void afis(str)’: user.cpp:18:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] void afis(str a){int i;printf("%d",a.v[a.v[0]]);for(i=a.v[0]-1;i>=1;i--){if(a.v[i]<=9) printf("00");else if(a.v[i]<=99) printf("0");printf("%d",a.v[i]);}} ^