	String Variables and String Variable Functions
 
      BASIC variables may be integers, floating point or string variables.
 Each of these type of variables may also be arrays of 1 or 2 dimensions.
 String variables are signified  by having a dollar sign ($) following the
 variable name.
 
	A string variable can contain from 0 to 255 ASCII characters (letters,
 numbers, and punctuation).  A string variable is created by assigning a
 quantity in quotes to the variable:
 
		A$ ="KMS FUSION"
		B$ ="ERDA CONTRACT"
 
	String variables may be concatenated to create larger strings, i.e.,
 the expression
 
		C$ = A$ + " HAS A " + B$
 
 creates a string  C$ = "KMS FUSION HAS A ERDA CONTRACT".
 
	BASIC posesses a number of built in functions to manipulate
 strings in a very simple manner.
 
 LEN(string)    Determine the length of the string.             L=LEN(A$)
 
 TRM$(string)   Trim trailing blanks off a string variable      B$=TRM$(string)
 
 POS(string1,string2,expression)
		Search string1 for the position of the set of characters
		(string2) starting with the character number given by the
		expression (an integer).  If POS does not find string2 it
		returns a zero.  The strings can be string variables or ASCII
		characters in quotes.
 
				X=POS("ABCDE","CD",1)
		In this example, starting at the first letter the string is
		searched for "CD" and returns a value of 3 to X.
 
 SEG$(string,expression1,expression2)
		The SEG$ function is used to copy a segment of a string from
		position given by expression1 to a position given by expres-
		sion2, into another string.
				A$ = SEG$("ABCDEFGHIJ",3,5)
			Sets  A$ ="CDE"
 
 ASC(string)    Converts the 1 character string to its ASCII decimal equivalent
 
 CHR$(expression) Converts the expression(0 or greater) to the ASCII letter
		code corresponds to the decimal value of the expression mod 256.
 
 VAL(string)    String may contain digits 0-9.  Converts the one character
		string to its numeric value.
		      X=VAL("9")  yields an X value of 9.
 
 STR$(expression) Takes the numeric value of the expression and converts it to
		a string variable.
 
 DAT$
 CLK$           Returns the value of the current date or time to the string
		variable.
			    X$ = CLK$  or  PRINT DAT$
 
