Compilare: user.c: In function ‘main’: user.c:40:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[x]++; ^ user.c:44:3: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(fr[last] == 0) ^ user.c:47:3: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[last]--; ^ user.c:20:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &n); ^ user.c:32:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &n); ^ user.c: In function ‘getch’: user.c:9:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(s, 1, 1 << BUFF, in); ^ user.c: In function ‘main’: user.c:37:7: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i == p) ^