Compilare: user.c: In function ‘citeste’: user.c:19:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(aux[ch]!=4){ ^ user.c:23:5: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(aux[ch]==4){ ^ user.c: In function ‘main’: user.c:49:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] dir[i]=aux[ch]; ^ user.c:36:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d ", &n, &k, &l, &c); ^