Apple II manual RIGHT$ Function, MID$ Function

ROCKW

ROCKWE

ROCKWEL

ROCKWELL

ROCKWELL R

ROCKWELL R6

ROCKWELL R65

ROCKWELL R650

ROCKWELL R6500

Since A$ has 14 characters this loop will be executed with N=1,2,3,...,13,14. The first time through only the first character will be printed, the second time the first two characters will be printed, etc.

RIGHT$ FUNCTION

Another string function, called "RIGHT$," returns the right N characters from a string expression. Try substituting "RIGHT$" for "LEFT$" in the previous example and see what happens.

MID$ FUNCTION

There is also a string function which allows us to take characters from the middle of a string. Try the following:

FOR N=1 TO LEN(A$):PRINT MID$(A$,N):NEXT N

ROCKWELL R6500

OCKWELL R6500

CKWELL R6500

KWELL R6500

WELL R6500

ELL R6500

LLR6500

L R6500

R6500

R6500

6500

500

00

0

"MID$" returns a string starting at the Nth position of A$ so the end (last character) of A$. The first position of the string is position 1 and the last possible position of a string is position 255.

Very often it is desirable to extract only the Nth character from a string. This can be done by calling MID$ with three arguments. The third argument specifies the number of characters to return.

For example:

FOR N=1 TO LEN(A$):PRINT MID$(A$,N,1),MID$(A$,N,2):NEXT N

R	RO
O	OC
C	CK
K	KW
W	WE
E	EL
L	LL
L	L
	R
R	R6
6	65
5	50

000

00

CONCATENATION-JOINING STRINGS

Strings may also be concatenated (put or joined together) through the use of the "+" operator. Try the following: