* HEX$(<numeric expression>)
Returns the hexadecimal string representation of the decimal
value of <numeric expression> with no leading zeroes.
Examples:    HEX$(ADR+OFFSET)    HEX$(N)    HEX$(99)

INP(<numeric expression>)
Performs a read from the machine input port <numeric expression>.
Returns the value of the machine input port <numeric expression>.

INT(<numeric expression>)
Returns the largest integer which is less than or equal to
<numeric expression>.  Examples:  INT(-3.5)  INT(0)  INT(3.14159)

LEFT$(<string expression>,<numeric expression>)
Returns the leftmost <numeric expression> characters of 
<string expression>.  Examples:  LEFT$(ANS$,3)    LEFT$(A$+B$,N-M)

LEN(<string expression>)
Returns the length of <string expression>.
Examples:  LEN(A$+B$)    LEN(ALPHABET$)    LEN("ABC"+STRING$)

* LOC(<variable name>)
Returns the decimal address of the location in memory
of the variable's value.  Useful for passing addresses
to routines which are accessed via the CALL function.
Examples:  LOC(ARRAY$(N))   LOC(N)   LOC(A$)

LOG(<numeric expression>)
Returns the natural logarithm (base e) of <numeric expression>.
Examples:  LOG(1)    LOG(X^2 +Y/5)    LOG(.5*SIN(X+Y))

* MATCH(<string expression>,<string expression>,numeric expression>)
Returns the position of the first occurence of the first string
expression in the second string expression, starting with the
character position indicated by the numeric expression.  A
zero will be returned if no match is found.  The following pattern
matching features are implemented:

	1)  A pound sign(#) will match any digit (0-9).
	2)  An exclamation mark (!) will match any upper
	or lower case letter.
	3)  A question mark (?) will match any character.
Examples:  MATCH("DEF","ABCDEFGHIJ",1)   (returns 4)
	   MATCH(PATTERN$,OBJECT$,START)

MID$(<string expression>,<numeric expression>[,<numeric expression>])
Without the optional second numeric expression, returns rightmost
characters of <string expression> starting with the first
<numeric expression>.  With the second numeric expression, returns
a string whose length is determined by the second numeric expression,
starting with the character of <string expression> whose position
is determined by the first numeric expression.
Examples:  MID$(A$,5)    MID$(STRING$,POSITION,LENGTH)






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