程序代码：

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<ctype.h>

int main()
{
    char** p_pointers=NULL;
    int count=0;
    int capacity=0;
    char conti;
    char* temp=NULL;
   

    do
    {
        if(count==capacity)
        {
            capacity+=5;
            p_pointers=realloc(p_pointers,(capacity)*sizeof(char*));
        }
        *(p_pointers+count)=malloc(100*sizeof(char));
        setbuf(stdin,NULL);
        scanf("%s",*(p_pointers+count));
           

            printf("Do you want to continue?( y or N )");
            setbuf(stdin,NULL);
            scanf("%c",&conti);
    }while(tolower(conti)=='y');
   

    for(int i=0;i<=count-2;i++)
        for(int j=i+1;j<=count-1;j++)
            if(strlen(*(p_pointers+i))>strlen(*(p_pointers+j)))
            {
                temp=*(p_pointers+i);
                *(p_pointers+i)=*(p_pointers+j);
                *(p_pointers+j)=temp;
            }
   

    for(int i=0;i<=count-1;i++)
        printf("%s\n",*(p_pointers+i));
    free(p_pointers);
}