c语言学习strcopy

  1 #include<stdio.h>
  2 #include<assert.h>
  3 char *mystrcpy(char *des,char *ser)
  4         {
  5           assert((des!=NULL)&&(ser!=NULL));
  6           char *adress=des;
  7           int num=0;
  8           while(*ser!=‘\0‘)
  9             {
 10                 *des++=*ser++;
 11                 num++;
 12             }   
 13           printf("data:%d\n",num);
 14           return adress;
 15 }         
 16 int main()
 17         {
 18           char a[]="hello qiuheng\n";
 19           char b[16]="aaaaa";
 20           int *e=NULL;
 21           char *p,*q;
 22           p=a;
 23           q=b;
 24           mystrcpy(q,p);
 25           printf("character:%s",q);
 26           //printf("num:%d\n",e);
 27           return 0;
 28 }