Compilare: user.cpp: In function ‘void add1(char*, char*)’: user.cpp:46:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[++a[0]] = t; ^ user.cpp: In function ‘void sub(char*, char*)’: user.cpp:64:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(A[0] > 1 && A[A[0]] == 0) ^ user.cpp: In function ‘void add2(char*, char*, char*)’: user.cpp:83:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[++a[0]] = t; ^ user.cpp: In function ‘void intToChar(int, int)’: user.cpp:98:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] L[i][++L[i][0]] = x % 10; ^