====== STRLEN() ======

Syntax:

  strlen!(<string pointer>)
  
The ''STRLEN()'' function returns the length of a string. The function accepts a string pointer (a literal string, a string pointer or a string pointer expression) as its single argument and returns a byte.

Example:

  a$ = "xc=basic"
  print strlen!(a$)
  rem -- outputs: 8
  print strlen!("hello world")
  rem --outputs: 11