叠拓测试笔试题

叠拓测试笔试题

概要：econdsinoneyear.(Toignoretheleapyear)#defineSEC_PER_YEAR(365*24*60*60UL)(Note:Ifyoudefineittobe(365*24*60*60)UL,youmaybefindthatitdoesnotpilewell.)b)PleasedefineaMacro,whichisusedtoparetwoparametersandreturnthesmallerparameter.#defineMIN(a,b)((a)char*Func(void){charp[10];strcpy(p,"111");returnp;}Thisfunctioncannotreturnthestringof"111";.3.Datadeclarations(10points)Pleasedefineavariableaccordingtothebelowrequirement,forexampleRequirement:Anint

叠拓测试笔试题,

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Instructions

PleaseanswerfollowingquestionsinEnglish,youcanonlyuselessthan60minutesforthistest

1.Preprocessor10points)

a)PleasedefineaMacrobyusingpreprocessinstruction#definein16-bitmachine,theconstantisusedtoindicatehowmanysecondsinoneyear.(Toignoretheleapyear)

#defineSEC_PER_YEAR(365*24*60*60UL)

(Note:Ifyoudefineittobe(365*24*60*60)UL,youmaybefindthatitdoesnotpilewell.)

b)PleasedefineaMacro,whichisusedtoparetwoparametersandreturnthesmallerparameter.

#defineMIN(a,b)((a)

2.Whatistheproblemofthebelowcode(5points)

#include

char*Func(void)

{

charp[10];

strcpy(p,"111");

returnp;

}

Thisfunctioncannotreturnthestringof"111";.

3.Datadeclarations(10points)

Pleasedefineavariableaccordingtothebelowrequirement,forexample

Requirement:Aninteger

Answer:inta;

a)Apointertoaninteger(1point)

int*a;

b)Apointertoapointertoaninteger(1point)

int**a;

c)Anarrayof10integers(1point)

inta[10];

d)Anarrayof10pointerstointegers(1point)

int*a[10];

e)Apointertoanarrayof10integers(2points)

int(*a)[10];

f)Apointertoafunctionthattakesanintegerasanargumentandreturnsaninteger(2points)

int(*a)(int)

g)Anarrayoftenpointerstofunctionsthattakeanintegerargumentandreturnaninteger(2points)

int(*a[10])(int)

4.What"stheoutputofthefunctionandwhy?(6points)

voidfoo(void)

{

unsignedinta=6;

intb=-20;

(a+b>6)?puts(">6"):puts("Result:">6";

Reason:Whenavariableofintegeroperateswithavariableofunsignedinteger,theintegerwillbeautomaticallyconvertedtounsignedinteger,sothe"-20";willbeconvertedtobealargeunsignedinteger.

5.Const(9points)

Inthefollowingcodes,therearesome"const";,whatismeaningofeachthem?

a)constchar*pa;

Thecontentofpaisread-only.

b)char*constpc=ca;

Theaddressofpcisread-only.

c)constchar*constpd=cb;

Boththeaddressandcontentofpdareread-only.

6.Accessingfixedmemorylocations(10points)

PleasemakeoutafewlinesofCcodesforaccessingafixedmemorylocation.Requirementistowriteanintvariable0xaa55intothefixedaddress0x67a9.

int*p;

p=(int*)0x67a9;

*p=0xaa55;

7.Typedef(10points)

Typedefisusedtodefineanewstructurewhichcanreplacetheoldstructure.

Youcanalsousepreprocessorforthesamethings.Buttheremustbedifferencebetweenthem,sopleasethinkofthebelowcode,andanswerwhatisthedifference?

#definedPSstructs*

typedefstructs*tPS;

Iwilldeclaretwoobjectvariablesforthem,suchas:

dPStest1,test2;

tPStest3,test4;

Youwillunderstandwhat"sthedifferences.

1.test1isapointerobjectofstructs,buttest2isnot,itisobjectofstructs.

2.bothtest3andtest4arepointerobjectofstructs.

8.What"stheoutputofthecode?(10points)

1〕#include

usingnamespacestd;

classBase

{

public:

virtualvoidf(floatx){coutclassDerived:publicBase

{

public:

virtualvoidf(floatx){coutvoidmain(void)

{

Derivedd;

Base*pb=d;

Derived*pd=d;

pb->f(3.14f);

pd->f(3.14f);

pb->g(3.14f);

pd->g(3.14f);

pb->h(3.14f);

pd->h(3.14f);

}

Result:

Derived::f(float)3.14

Derived::f(float)3.14

Base