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

#define COUNT 10

int
main()
{
    char *p =(char *)malloc( sizeof( char ) * ( COUNT + 1 ) );
    unsigned  int i = 0;
    while( scanf( "%c", p + i ) == 1 )   
   {
        i ++;
        if( i > COUNT )
        {
            p = ( char * ) realloc( p, sizeof( char ) * (i + 1 ) );
            if( p == NULL )
                return NULL;
        }
    }
    if( i < COUNT )
    {
        p = ( char * ) realloc( p, sizeof( char ) * ( i + 1 ) );
        if( p == NULL )
            return NULL;
    }
    *( p + i + 1 ) = NULL;
    puts( p );
    return 0;
}
怎么输入才能够使这个循环停止？？？？？