一道C语言编程题,求大神们帮帮忙,谢谢了。。答:case 1:printf("正序为:%d\n",num);printf("逆序为:%d\n",num);break;case 2:printf("正序为:%d\n",num);printf("逆序为:%d%d\n",num%10,num/10);break;case 3:printf("正序为:%d\n",num);printf("逆序为:%d%d%d\n",num%10,num%100/10,num/100);break;case 4:printf...