Compilare: user.c: In function ‘cmlsc’: user.c:55:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘read’: user.c:62:15: 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:74:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &len_a); ^ user.c:75:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &len_b); ^