A.strcpy1(char *p, char *q)
{ while ((*p++=*q++)!='\0')
}
B.strcpy2( char *p, char *q)
{ while((*p=*q)!='\0')
{p++ q++}
C.strcpy3(char*p, char *q)
{ while (*p++=*q++)
D.strcpy4(char *p, char *q)
{ while(*p)
*p++=*q++