#include<stdio.h>
void display(int n, char *str[])
{
  int i=0;
  while(i<n) printf("%s ",str[i++]);
}
int main()
{
  display(1,"Hello");
  return 0;
}

**ptr = *ptr[]

Well, char **ptr is a double pointer (pointer to a pointer) of char while char *ptr[] is an open array of pointer to char.

According to cdel, char **p; gives the result of "declare p as pointer to pointer 
to char" while char *p[]; gives "declare p as array of pointer to char."

Character strings are always arrays, and arrays are generally always pointers,
so the two are generally equivalent which means that **ptr = *ptr[]. 
What you end up with is an array of an array of chars, or an array of strings.
Take main() for instance:

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