String Function - Sharp MZ-700 Series Owner's Manual

5 String Function
>.1 LEN
Format
Function
Example
LEN (XS)
X$ . . . String expression
This funcion returns the number of characters included in the string expression
represented by X$. This value includes spaces which are not displayed on the screen
and any control characters in the string, as well as letters, numefals, and symbols.
(Example 1)
1 0 A $ =
1 1
A B C D E F G "
2 0 P R I N T L E N ( A $ >
R U N
7
(Example 2) The following program uses the LEN funcition to draw squares on the
screen.
1 0 9 " E " : 9 " E N T E R 3 0 R M O R E A S T E R I S K S "
2 0 I N P U T A S
3 0 F O R I = 1 T O L E N ( A S ) - 2
4 0 P R I N T T A B ( 2 ) ; " * " ; S P C ( L E N ( A S ) - 2 ) ; " ' * "
5 0 N E X T I
6 0 P R I N T T A B ( 2 ) ; A S : G O T O 2 0
(Example 3) The LEN function can also be used to produce a "parade" of charac-
ters as shown below.
1 0 S $ = " S H A R P B A S I C "
2 0 F O R 1 = 1 T O L E N ( S S )
3 0 9 R I G H T S ( S S , I )
4 0 N E X T I
5 0 E N D
R U N
C
I C
S I C
S H A R P B A S I C
(Example 4)
P R I N T L E N ( S T R S ( P A I ( 1 ) ) ) J
9
PAI (1), the function which returns the value of the ratio of the circumference of a
circle to its diameter, contains the 8-digit constant 3.1415927 (approximately the
value of PI). When the length of the character string produced by converting this
constant with the STR$ function is evaluated with the LEN function, a total string
length of 9 is returned.