一级指针，二级指针，指向数组的指针

对"black,green,yellow,pin,red"几个单词排序

01

#include <iostream.h>
#include <string.h>
void sort(char (*p)[20],int n)
{
	char *q;
	char b[20];
	q=b;
	int i,j;
	for(i=0;i<n;i++)
	{
		for(j=i+1;j<n;j++)
		{
			if(strcmp(p[i],p[j])>0)
			{
				strcpy(q,*(p+i));
				strcpy(*(p+i),*(p+j));
				strcpy(*(p+j),q);
			}
		}
	}
}
void main()
{
	char a[5][20]={"black","green","yellow","pin","red"};
	sort(a,5);
	for(int i=0;i<5;i++)
	{
		cout<<a[i]<<endl;
	}
}

　　02

#include <iostream.h>
#include <string.h>
void sort(char *p[],int n)
{
	char *q;
	int i,j;
	for(i=0;i<n;i++)
	{
		for(j=i+1;j<n;j++)
		{
			if(strcmp(*(p+i),*(p+j))>0)
			{
				q=*(p+i);
				*(p+i)=*(p+j);
				*(p+j)=q;
			}
		}
	}
}
void main()
{
	char a[5][20]={"black","green","yellow","pin","red"};
	char *q[5];
	for(int i=0;i<5;i++)
	{
		q[i]=a[i];
	}
	sort(q,5);
	for(i=0;i<5;i++)
	{
		cout<<q[i]<<endl;
	}
}

　　03

#include <iostream.h>
#include <string.h>
void sort(char *p,int n)
{
	char *q;
	char b[20];
	q=b;
	int i,j;
	for(i=0;i<n;i++)
	{
		for(j=i+1;j<n;j++)
		{
			if(strcmp(p+i*20,p+j*20)>0)
			{
				strcpy(q,p+i*20);
				strcpy(p+i*20,p+j*20);
				strcpy(p+j*20,q);
			}
		}
	}
}
void main()
{
	char a[5][20]={"black","green","yellow","pin","red"};
	char *q;
	q=&a[0][0];
	sort(q,5);
	for(int i=0;i<5;i++)
	{
		cout<<a[i]<<endl;
	}
}

　　04

#include <iostream.h>
#include <string.h>
void sort(char **p,int n)
{
	char *q;
	int i,j;
	for(i=0;i<n;i++)
	{
		for(j=i+1;j<n;j++)
		{
			if(strcmp(*(p+i),*(p+j))>0)
			{
				q=*(p+i);
				*(p+i)=*(p+j);
				*(p+j)=q;
			}
		}
	}
}
void main()
{
	char a[5][20]={"black","green","yellow","pin","red"};
	char *q[5];
	for(int i=0;i<5;i++)
	{
		q[i]=a[i];
	}
	sort(q,5);
	for(i=0;i<5;i++)
	{
		cout<<a[i]<<endl;
	}
}