Strings
DG Pascal also provides the following functions for handling and manipulating strings.

• APPEND
  concatenate two strings. calling format is
  

  	APPEND( string1, string2 );
  
  	where string2 is added onto the end of string1.
  
  

• LENGTH
  returns a short_integer which represents the length (number of
  characters) of the string.
  

  	LENGTH( stringname );
  
  

• SETSUBSTR
  replaces a substring in a target string with a substring from
  a source string.
  

  	SETSUBSTR( Targetstr, tstart, tlen, Sourcestr, sstart );
  
  
  	where
  	Targetstr is the target string
  
  	
  	tstart is an integer representing the start position
  
          (within Targetstr) of the substring that is to be replaced
  
  
  	tlen is an integer representing the length of the substring
  
  	that you are replacing in Targetstr
  
  
  	Sourcestr is the source string which contains the substring
  
  
  	sstart is an integer which specifies the starting position
  
  	of the substring within Sourcestr