Compilare: user.c: In function ‘cmlsc’: user.c:52:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘read’: user.c:59:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", a + i); ^ user.c: In function ‘main’: user.c:71:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &len_a); ^ user.c:72:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &len_b); ^