Commodore 128D - Page 328

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LEFTS
—Return the leftmost characters of string
LEFTS (string,integer)
This function returns a string comprised of the number of leftmost
characters of the string determined by the specified integer. The
integer argument must be in the range 0 to 255. If the integer is
greater than the length of the string, the entire string is returned. If
an integer value of zero is used, then a null string (of zero length) is
returned.
EXAMPLE:
PRINT LEFTS ("C0MM0D0RE",5>
COMMO
LEN —Return the length of a string
LEN (string)
This function returns the number of characters in the string expres
sion. Non-printed characters and blanks are included.
EXAMPLE:
PRINT LEN ("COMMODORE128")
12
LOG
—Return natural log of X
LOQ(X)
This function returns the natural log of X. The natural log is log to the
base e (see EXP(X)). To convert to log base 10, divide by LOG(10).
EXAMPLE:
PRINT LOG (37/5)
2.00148
MID$
—Return a substring from a larger string
MID$ (string,starting position[,length])
This function returns a substring specified by the LENGTH, starting
at the character specified by the starting position. The starting posi
tion of the substring defines the first character where the substring
begins. The length of the substring is specified by the length argue-
ment. If the starting position value (range 1 -255) is greater than the
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BASIC 7.0 ENCYCLOPEDIA-Basic Functions