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CP-AS-10-08Mark scheme

COMP1

Marks 25Answer all questions

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Put your answers ont o the document "CP- AS- 10- 08 Answers"

Thi s program when f i ni shed wi l l enabl e a user t o car r y out some usef ul

everyday conver si ons. Al ong wi t h t he answer document you wi l l f i nd t heskel et on code f or t hi s pr ogr am on t he school websi t e

Exmouth Col l ege > Subj ect s > I CT & Comput i ng > I CT Year 12 : .

usi ng Syst em;usi ng System. Col l ect i ons. Gener i c;usi ng Syst em. Li nq;usi ng Syst em. Text ;

namespace CShar pExamPr act i ce1{

cl ass Pr ogr am { stat i c i nt sel ect i on;

st at i c i nt MenuOpt i on( ) { i nt choi ce = 0; bool val i dNumber = f al se;

Consol e. Wr i t eLi ne( ) ; Consol e. Wr i t eLi ne( "Ent er a number t o choose an opt i on: " ) ; Consol e. Wr i t eLi ne( " 1 Conver t Fahr enhei t t o Cel si us 3Conver t Mi l es t o Ki l omet er s" ) ; Consol e. Wr i t eLi ne( " 2 Conver t t o Fahr enhei t 4

Conver t Ki l omet er s t o Mi l es" ) ; Consol e. Wr i t eLi ne( " 5 Exi t ") ; Consol e. Wr i t eLi ne( ) ; Consol e. Wr i t e( "Your choi ce: ") ;

choi ce = Conver t . ToI nt 32( Consol e. ReadLi ne( ) ) ;

r et ur n choi ce;

}

st at i c bool Val i dat eDat a( st r i ng s) { st r i ng st r = s; t r y / / we haven' t cover ed val i dat i on yet but you wi l l f i ndt he detai l s on pages 95 - 98 { doubl e d = Conver t . ToDoubl e( s) ; r et ur n t r ue; } cat ch { Consol e. Wr i t eLi ne( "Thi s was not a number " ) ; Consol e. Wr i t eLi ne( "Pl ease t r y agai n") ; r et ur n f al se; }

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}

st at i c voi d Conver t ToCel si us( ) { St r i ng Degr eesFahr enhei t St r ; doubl e Degr eesFahr enhei t ; doubl e Degr eesCel si us; Consol e. Wr i t e( "Ent er f ahr enhei t val ue : ") ; Degr eesFahr enhei t St r = Consol e. ReadLi ne( ) ; Degr eesFahr enhei t = Conver t . ToDoubl e(Degr eesFahr enhei t St r ) ; Degr eesCel si us = ( Degr eesFahr enhei t - 32) *( 5/ 9) ; Consol e. Wr i t e( "Thi s i s ") ; Consol e. Wr i t eLi ne( Degr eesCel si us) ;

}

st at i c voi d Conver t ToFahr enhei t ( ) { Consol e. Wr i t eLi ne( "You wi l l need t o wr i t e t he code f or t he

pr ocedur e Conver t ToFahr enhei t your sel f " ) ; }

st at i c voi d Conver t ToKi l omet er s( ) { Consol e. Wr i t eLi ne( "You wi l l need t o wr i t e t he code f or t hepr ocedur e Conver t ToKi l omet er s your sel f " ) ; }

st at i c voi d Conver t ToMi l es( ) { Consol e. Wr i t eLi ne( "You wi l l need t o wr i t e t he code f or t hepr ocedur e Conver t ToMi l es your sel f " ) ; }

st at i c voi d Mai n( st r i ng[ ] ar gs) { Consol e. Wr i t eLi ne( "Usef ul Conver t er ") ; sel ect i on = MenuOpt i on( ) ; whi l e ( sel ect i on ! = 5) { swi t ch ( sel ecti on) { case 1: Conver t ToCel si us( ) ; br eak; / / t he br eak st at ement t r ansf er s cont r olout ot t he case body case 2:

Conver t ToFahr enhei t ( ) ; br eak; / / t he br eak st at ement t r ansf er s cont r olout ot t he case body case 3: Conver t ToKi l omet er s( ) ; br eak; / / t he br eak st at ement t r ansf er s cont r olout ot t he case body case 4: Conver t ToMi l es( ) ; br eak; / / t he br eak st at ement t r ansf er s cont r olout ot t he case body

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} sel ect i on = MenuOpt i on( ) ; }

i f ( sel ecti on < 5) Consol e. ReadLi ne( ) ; } }}

Gi ve an exampl e of gl obal var i abl e.1 a

(1 Mark)

sel ecti on / t here ar e none?

Gi ve an exampl e of a l ocal var i abl e.b

(1 Mark)

choi ce / val i dnumber st r

Gi ve an exampl e of a f unct i on.c

(1 Mark)

val i datedata / MenuOpt i on

Expl ai n how a f unct i on di f f er s f r oma pr ocedur e.d

(1 Mark)

A f unct i on r eturns a val ue / a f unct i on can be part of an expr essi on

whereas

a pr ocedure does not r etur n a val ue / i s cal l ed as a statement

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Wr i t e a pr ocedur e Conver t ToKm t o conver t mi l es t o ki l omet er s.The conver si on f or mul a i s:

1 mi l e = 1. 6 km

1 e

(5 Marks)

decl ar e var i abl es Mi l esSt r st r i ng Ki l omet er s & Mi l es doubl e = al l t hr ee 1 mar kcor r ect t ype 1 mark

Good pr ompt and i nput st r i ng = 1 mark

Conver t st r i ng t o doubl e = 1 mark

corr ect assi gnment t o cal cl ate = 1 mark

corr ect out put 1 mark

MAX 5

An exampl e of boundary dat a mi ght be t he empt y st r i ng.

Thi s shoul d not cause an er r or but gi ve t he empt y st r i ng as aresul t .

Wr i t e the i nst r uct i ons necessar y t o handl e t hi s boundar y val ue.

Copy t he ent i r e code f or your Conver t ToKm pr ocedur e i nt o youranswer .

f

(4 Marks)

Thi s quest i on r ef er s t o t est i ng t he procedure Conver t ToKm.

To t est a r out i ne adequat el y, normal , boundar y and er r oneousdat a need to be used.

Look at your ver si on of t he f unct i on Conver t ToKm.

Gi ve t wo sui t abl e val ues of normal t est data.

g

(2 Marks)

t r y / cat ch 1 mark

I f l engt h = 0 1 mark

out put "" 1 mark

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Thi s quest i on r ef er s t o t he mai n MenuOpt i on sub- program.

The sub program shoul d show t he menu r epeat edl y t o t he userunt i l t he user ent er s a val i d number ( 1, 2, 3, 4 or 5) .

Wr i t e t he code t o r epeat t he i nput t o t he var i abl e choi ce unt i la cor r ect val ue i s ent er ed.

1 h

(4 Marks)

I f ( Choi ce 5) 1 markf or Appror i at e er r or message 1 mark

I f ( choi ce >1) AND ( choi ce

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COMP2

Marks 8Answer all questions

Look at t he t r ut h tabl e bel ow.

+- - - - - - - +- - - - - - - +- - - - - - - +| I nput | I nput | Out put || A | B | Q |+- - - - - - - +- - - - - - - +- - - - - - - +| 0 | 0 | 1 |+- - - - - - - +- - - - - - - +- - - - - - - +| 0 | 1 | 0 |+- - - - - - - +- - - - - - - +- - - - - - - +

| 1 | 0 | 0 |+- - - - - - - +- - - - - - - +- - - - - - - +| 1 | 1 | 0 |+- - - - - - - +- - - - - - - +- - - - - - - +

What l ogi c gat e does t hi s r epr esent ?

2 a

(1 Mark)

NOR Gat e

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An i nt er i or l i ght i n a t wo- door car i s cont r ol l ed by twoswi t ched t hat t he dr i ve can t ur n on or of f and t wo sensor s, oneper door .

The swi t ches ar e named A and B.The door sensor s ar e named C and D.The i nt er i or l i ght i s named L.I f a door i s open t he out put of i t s sensor i s on.I f a door i s cl osed t he out put of i t s sensor i d of f .

Of bot h swi t ches A and B ar e of f t hen t he l i ght L i s al ways of f .I f swi t ch A i s on t he l i ght L i s al ways on.I f swi t ch B i s on and swi t ch A i s of f t hen:

t he l i ght L t ur ns on i f one or mor e of t he car door s i s opened.The l i ght L t urns of f i f bot h of t he doors ar e cl osed.

The f ol l owi ng symbol s ar e used t o r epresent l ogi c gat es:

- - - - - O- - -

AND OR NOTUsi ng onl y AND, OR and NOT gates dr aw a ci cui t f or t hi s syst emi n the box bel ow. You may not need to use al l t hr ee t ypes aofgate.

+- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + | | | | A- O | | | | | | | | | | | B- O | | | | | | O- L | | | | C- O | | |

| | | | | | | | D- O | | | | | | | +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +

2 b

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(3 Marks)

Wr i t e a Bool ean expr essi on t o repr esent t he l ogi c of t hei nter i or l i ght sys tem

c

(1 Mark)

A + B . ( C + D)

A + B . C + B . D _A + A . B . ( C + D)

_ _A + A . B . C + A . B . D

Si mpl i f y t he Bool ean expr essi on bel ow showi ng your worki ng.

_____- - -A + B + B . A

d

(3 Marks)

- - -= A + B + B . A

_= A . B + B . A

= B . (A + A)

= B . 1

= B

OR Use t r uth t abl e.

8

Computing Summer 2009 COMP2 Q 4

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CP-AS-10-08.pdf