#include<myhead.h>

void fun(int n)
{
	if(n>9)
	{
		fun(n/10);
		printf("%d\t",n%10);
		putchar(10);
		return;
	}
	else
	{
		printf("%d\n",n%10);
		return;
	}
}
int main(int argc, const char *argv[])
{
	int num;
	printf("请输入一个整数：");
	scanf("%d",&num);
	fun(num);
	return 0;
}	

 

#include<myhead.h>

void fun(int n)
{
	if(n>0)
	{
		fun(n/2);
		printf("%d",n%2);
	}
}
int main(int argc, const char *argv[])
{
	int num;
	printf("请输入一个数：");
	scanf("%d",&num);
	fun(num);
	putchar(10);
	return 0;
}	

 

 

#!/bin/bash
head -5 /etc/group | tail -1
mkdir /home/ubuntu/copy
cd /home/ubuntu/copy
sudo cp /etc/shadow /home/ubuntu//copy/test
sudo chown root /home/ubuntu//copy/test
sudo chmod o-w,o-r,o-x /home/ubuntu//copy/test
ubuntu@ubuntu:~/23051/C高级/day2$