LEN

Action: Returns the number of characters in the string expression. Non-printed characters and blanks are counted.

   CC$ = "COMMODORE COMPUTER": PRINT LEN(CC$)

    18

LET

Action: The LET statement can be used to assign a value to a variable. But the word LET is optional and therefore most advanced programmers leave LET out because it's always understood and wastes valuable memory. The equal sign (=) alone is sufficient when assigning the value of an expression to a variable name.

   10 LET D= 12              (This is the same as D = 12)
   20 LET E$ = "ABC"
   30 F$ = "WORDS"
   40 SUM$= E$ + F$          (SUM$ would equal ABCWORDS)