Compilare: user.c: In function ‘calc’: user.c:25:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:29:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:33:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:37:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:44:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:48:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:55:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c:62:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[x] = 1; ^ user.c: In function ‘main’: user.c:79:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &s); ^ user.c:83:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^