Sharp PC-1403

9 1
Each lin e o f a progr am m u s t h a v e a un i q ue li ne n u m be r - an y i nte ger be tw e en 1 a n d
65279. Li n e nu mbers are t h e ref e r e nc e f o r t h e c o m pu ter . T he y te ll t he co m p ut e r t h e
ord er i n wh i c h t o e xecut e th e progr am . Yo u n ee d not ente r l i nes i n seq uen t i a l o r de r
( al th oug h if yo u ar e a b e g i nn i ng p r og ra mme r, i t i s p r o b ab ly less co nf u s in g f o r y o u to d o
so) . The co mput e r a l w ays be g i n s e x ec u t i o n wi t h the l o w e st lin e nu mber and m ove s
se q uen t ia ll y t hrough t h e li n es o f a pro g r am i n ascending o rd e r .
Whe n p r o g ra mm i ng , i t is w i s e to a l l o w i n cr e ments i n yo u r li ne nu m b e ring (1 0 , 20 , 3 0 ,
. . . 10 , 30 , 5 0 , e t c .) . T h i s e n ab l es yo u t o i n se rt ad d it i ona l li ne s if n ec e s sary .
CAUTION: Do not use the same line numbe r s i n d i ffe r ent prog r a m s. If you u se th e
s am e lin e n umb e r , th e o l de s t li ne w i t h tha t n u m be r i s dele te d wh en y ou en ter the new
lin e .
line Numbers
The compute r i nterpre t s i ns tructi on s a cc or d i ng to a pr ede t erm ined for m at. T h is format
is ca l led a statement. You alwa y s e n t e r BA S I C s tate m ent s i n t he s a me pattern.
Statements must s t a rt w i t h a li ne n u m be r :
H1l: PRINT " HEL LO "
20 : END
30 :
-BASl~t~ ~
- - - --
A program co n sis t s o f a s et o f i n struct i ons t o the co mpu t er. R em embe r t h e compu t e r
i s only a m ac h i n e. I t w i ll perform t he e x a ct o p erat i o n s th a t you spe c if y. You, t h e
programmer, a r e r e spons i ble fo r iss u i ng the corr ect i n st ru ct i on s .
Programs
In the pre v i ou s cha p t e r, w e examin ed so m e of the c o ncept s an d t e rm s o f t h e BASIC
pro gra mm ing l a n gua ge . I n th is chapte r , yo u w i ll u s e t h es e e l em en ts t o create
p ro g r a m s o n the c o mp u t er. Le t us reite r a t e , how e ver, th at t hi s is not a m an u a l on how
to p ro gram i n B A SI C. Wha t this chapte r w il l do i s to f a m ili ariz e y o u wi th the u se of
BA S I C o n yo u r c omp ute r .
CHAPTERS .
PROGRAMMING THE COMPUTER
Prog r amming the Computer