#include<stdio.h>

   #include<assert.h>

   char *mystrcpy(char *des,char *ser)

           {

             assert((des!=NULL)&&(ser!=NULL));

             char *adress=des;

             int num=;

             while(*ser!='\0')

               {

                  *des++=*ser++;

                  num++;

              }

            printf("data:%d\n",num);

            return adress;

  }

  int main()

          {

            char a[]="hello qiuheng\n";

            char b[]="aaaaa";

            int *e=NULL;

            char *p,*q;

            p=a;

            q=b;

            mystrcpy(q,p);

            printf("character:%s",q);

            //printf("num:%d\n",e);

            return ;

  }