What the code trying to do

[Lim Boon Jye]

int noname(const char*p)
{
      char *r = (char*)p;
      while(*r!='\0')
      r++;
      return r - p;
}

I not really understand how the code trying to say

It's say that what negative aspects of pointer does this fragment exhibit that makes it difficult to read?

[vlad from moscow]

The code calculates the length of a character array pointed to by 'p'. It finds the terminate symbol '\0' and then substructs the pointer to the initial symbol from the pointer to that terminate symbol and gets number of bytes between them.
It would be better to write

const char *r = p;

instead of

char *r = (char*)p;

[Lim Boon Jye]

can provide a example for me?

example i insert a string of

flower

[vlad from moscow]

I did not understand what example are you speaking about?

Using of the function

char s[] = "This is an example";

std::cout << "Length of s is equal to " << noname( s ) <<  std::endl; 

[Script Coder]

Not to be pedantic, but vlad please change the ';' to a ':' in std::cout

[vlad from moscow]

@Script Coder
Not to be pedantic, but vlad please change the ';' to a ':' in std::cout

Thanks, I hope I have updated this typo.:)