Compilare: user.cpp: In function ‘int main()’: user.cpp:30:100: warning: array subscript has type ‘char’ [-Wchar-subscripts] while((x[i]>='A'&&x[i]<='Z')||(x[i]>='a'&&x[i]<='z')) m0[m0[0].nrel].a[m0[m0[0].nrel].a[0]]=x[i],i++,m0[m0[0].nrel].a[0]++; ^ user.cpp:47:100: warning: array subscript has type ‘char’ [-Wchar-subscripts] while((x[i]>='A'&&x[i]<='Z')||(x[i]>='a'&&x[i]<='z')) mi[mi[0].nrel].a[mi[mi[0].nrel].a[0]]=x[i],i++,mi[mi[0].nrel].a[0]++; ^