Compilare: user.cpp: In function ‘int main()’: user.cpp:52:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] muta(a['*'],a[s[0]]); ^ user.cpp:53:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=0;i<lung-1;i++) muta(a[s[i]],a[s[i+1]]); ^ user.cpp:53:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=0;i<lung-1;i++) muta(a[s[i]],a[s[i+1]]); ^ user.cpp:55:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] muta(a[s[lung-1]],a['#']); ^