And 5 - Sharp PC-1500 Instruction Manual

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The fi(St argu1nent to this fur1ction is a cha(aCttP.( string or a characte r string va.riable. The seco nd
argument is a number rep resent ing the first character to be e:xtracted. The th ird argument is the
total number of characters, including the fi rst, to be extracted.
In the f irst example, "I NEED HELP" is stored in AS. MIDS extracts four characters beginning
at the third, and places these into
SS.
When
6$
is printed, i t is found to contain "NEED''.
In t he second example ,
a
string containing a telephone number is the f irs t argument. The sixth
character ("7") is located and , together with the following two characters, is stored in the variable
TS. When print.cd. the result is
" 743".
C.7. RIGHT$
The RIGHT$ function works much like LEF TS. the only difference bei ng that i t starts from
the opposite (right} end of the string. The arguments arc the same as LEFTS:
RIGHT$
("ch aracter string", n umber)
( character variable, number)
The "number " argumen t to this fun c tion specifies h ow many charact ers to extract from the
c hnract cr string bcginni1 19 on the right side.
Example 1:
10 XS = "READ ONLY MEMORY"
20
YS = RIGHTS (XS.
6)
30 PRINT Y$
In this p rogram the R IGHTS functio n takes six characters from the right end of the s t ring and
stores them in t ile variable YS. The con tent of YS is now "MEMORY".
C.8. RND
There ll' 1 ay be ti mes \•;1hen you want to provide your program \Vith random n·umbers . The RNO
functions allows the computer to generate random nurnbers in a range fr om o ne to a specified
nurn ber. {Note : The range a l\vays starts •tJith o rle)
Example 1:
10 A = AND 5
In this exa mple A could have any one of the values one through five, inclu sive. If you ,.vant
random. nu1nbers in a range whii;h begins \Yitlh a number o ther than 1, (for example 40 to 50}
you will have tu s imulate this by generating ra:ndom numbcrs·from
1 to 10
and adding a constant
(39 in ou r example}:
Example 2:
10
FO R I = 1 TO 5
20 B = 40+RND
10
40
PR INT
B :
50
NEXT I
Output :
[ 42
AUN
; I
44 47
48
42
77
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