c語言程序設(shè)計現(xiàn)代方法(第二版)習題答案1

Chapter2

AnswerstoSelectedExercises

2.[was#21(a)Theprogramcontainsonedirective(#include)andfour

statements(threecallsofprintfandonereturn).

(b)

Parkinson'sLaw:

Workexpandssoastofillthetime

availableforitscompletion.

3.[was#4]

ttinclude<stdio.h>

intmain(void)

(

intheight=8,length=12,width=10,volume;

volume=height*length*width;

printf(^Dimensions:%dx%dx%d\n〃，length,width,height);

printf(Z/Volume(cubicinches):%d\nz，,volume);

printf(^Dimensionalweight(pounds):%d\n”,(volume+165)/166);

return0;

)

4.[was#6]Here'sonepossibleprogram:

ttinclude<stdio.h>

intmain(void)

(

inti,j,k;

floatx,y,z;

printf("Valueofi:%d\nz，,i);

printf("Valueofj：%d\n〃，j);

printf("Valueofk:%d\n〃，k);

printf("Valueofx:%g\nz，,x);

printf("Valueofy：y);

printf(^Valueofz:%g\n，/,z);

return0;

)

WhencompiledusingGCCandthenexecuted,thisprogramproducedthe

followingoutput:

Valueofi:5618848

Valueofj：0

Valueofk:6844404

Valueofx:3.98979e-34

Valueofy:9.59105e-39

Valueofz:9.59105e-39

Thevaluesprinteddependonmanyfactors,sothechancethatyou'11get

exactlythesenumbersissmall.

5.[was#10](a)isnotlegalbecause100_bottlesbeginswithadigit.

8.[was#12]Thereare14tokens:a,=,(,3,*,q,p,*,p,),/,3,

and

AnswerstoSelectedProgrammingProjects

4.[was#8;modified]

ftinclude<stdio.h>

intmain(void)

(

floatoriginal_amount,amount_withtax;

printf("Enteranamount:〃)；

scanf(//%f&original_amount);

amount_with_tax=original_amount*1.05f;

printf("Withtaxadded:$%.2f\n〃，amount_with_tax);

return0;

)

Theamount_with_taxvariableisunnecessary.Ifweremoveit,theprogram

isslightlyshorter:

ttinclude<stdio.h>

intmain(void)

(

floatoriginal_amount;

printf("Enteranamount:〃)；

scanf(〃%f”,&original_amount);

printf("Withtaxadded:$%.2f\n”,original_amount*1.05f);

return0;

)

Chapter3

AnswerstoSelectedExercises

2.[was#2]

(a)printf(/z%-8.le^,x);

(b)printf6e〃，x);

(c)printfC%-8.3f*,x);

(d)printf(〃％6.Of”,x);

5.[was#8]Thevaluesofx,i,andywillbe12.3,45,and.6,respectively.

AnswerstoSelectedProgrammingProjects

1.[was#4;modified]

ttinclude<stdio.h>

intmain(void)

(

intmonth,day,year;

printf("Enteradate(nun/dd/yyyy):〃)；

scanf(〃%d/%d/%cT,&month,&day,&year);

printf(Z/Youenteredthedate%d%.2d%.2d\n，z,year,month,day);

return0;

)

3.[was#6;modified]

ttinclude<stdio.h>

intmain(void)

(

intprefix,group,publisher,item,check_digit;

printf("EnterISBN:〃)；

scanf(/，%d-%d-%d-%d-%d，z,&prefix,&group,fcpublisher,&item,

&checkdigit);

printf(〃GS1prefix:%d\n/z,prefix);

printf("Groupidentifier:%d\n〃，group);

printf("Publishercode:%d\n〃，publisher);

printf("Itemnumber:%d\n/z,item);

printf("Checkdigit:%d\n〃，check_digit);

/*Thefiveprintfcallscanbecombinedasfollows:

printf(Z，GS1prefix:%d\nGroupidentifier:%d\nPublisher

code:%d\nltemnumber:%d\nCheckdigit:%d\n，z,

prefix,group,publisher,item,checkdigit);

*/

return0;

)

Chapter4

AnswerstoSelectedExercises

2.[was#2]NotinC89.Supposethatiis9andjis7.Thevalueof(~i)/j

couldbeeither-1or-2,dependingontheimplementation.Ontheother

hand,thevalueof-(i/j)isalways-1,regardlessoftheimplementation.

InC99,ontheotherhand,thevalueof(-i)/jmustbeequaltothevalue

of-(i/j).

9.[was#6]

(a)638

(b)321

(c)2-13

(d)000

13.[was#8]Theexpression++iisequivalentto(i+=1).Thevalueof

bothexpressionsisiaftertheincrementhasbeenperformed.

AnswerstoSelectedProgrammingProjects

2.[was#4]

ftinclude<stdio.h>

intmain(void)

(

intn;

printf("Enterathree-digitnumber:〃)；

scanf&n);

printf(z，Thereversalis:%d%d%d\n，z,n%10,(n/10)%10,n/100);

return0;

)

Ch叩ter5

AnswerstoSelectedExercises

2.[was#21

/\

\(a/!1

/b1\

X(71

(/\

\c/)1

(/d\

X71

4.[was#4](i>j)-(i<j)

6.[was#12]Yes,thestatementislegal.Whennisequalto5,itdoes

nothing,since5isnotequalto-9.

10.[was#16]Theoutputis

onetwo

sincetherearenobreakstatementsafterthecases.

AnswerstoSelectedProgrammingProjects

2.[was#6]

ttinclude<stdio.h>

intmain(void)

(

inthours,minutes;

printf("Entera24-hourtime:〃)；

scanf(〃%d:%d〃，&hours,&minutes);

printf(^Equivalent12-hourtime:〃)；

if(hours==0)

printf("12:%.2dAM\n〃，minutes);

elseif(hours<12)

printf(/z%d:%.2dAM\nzz,hours,minutes);

elseif(hours==12)

printf(〃與d:%.2dPM\n〃，hours,minutes);

else

printf(z，%d:%.2dPM\n",hours-12,minutes);

return0;

)

4.[was#8;modified]

#include<stdio.h>

intmain(void)

(

intspeed;

printf("Enterawindspeedinknots:〃)；

scanf(〃%d〃，&speed);

if(speed<1)

printf(〃Calm\n");

elseif(speed<=3)

printf(z，Lightair\n〃)；

elseif(speed<=27)

printf("Breeze'n");

elseif(speed<=47)

printf("Gale\n〃)；

elseif(speed<=63)

printf(z/Storm\nzz);

else

printf("Hurricane\n〃);

return0;

)

6.[was#10]

ttinclude<stdio.h>

intmain(void)

(

intcheck_digit,d,il,i2,i3,i4,i5,jl,j2,j3,j4,j5,

first_sum,second_sum,total;

printf("Enterthefirst(single)digit:");

scanf(，z%ldz，,&d);

printf("Enterfirstgroupoffivedigits:〃)；

scanf&il,&i2,&i3,&i4,&i5);

printf("Entersecondgroupoffivedigits:〃)；

scanf&jl,&j2,&j3,&j4,&j5);

printf("Enterthelast(single)digit:〃)；

scanf(/z%Idz，,&check_digit);

first_sum=d+i2+i4+jl+j3+j5;

second_sum=il+i3+i5+j2+j4;

total=3*first_sum+second_sum;

if(check_digit=9-((total-1)%10))

printf("VALID'n");

else

printfCNOTVALTD\n3;

return0;

}

10.[was#14]

#include<stdio.h>

intmain(void)

(

intgrade;

printf("Enternumericalgrade:");

scanf&grade);

if(grade<0||grade>100){

printf("Illegalgrade\n〃)；

return0;

)

switch(grade/10){

case10:

case9:printf("Lettergrade:A\n〃)

break;

case8:printf(''Lettergrade:B\n〃)

break;

case7:printf("Lettergrade:C\n〃)

break;

case6:printf(^Lettergrade:D\n〃)

break;

case5:

case4:

case3:

case2:

case1:

case0:printf(^Lettergrade:F\n〃)；

break;

)

return0;

)

Ch叩ter6

AnswerstoSelectedExercises

4.[was#10](c)isnotequivalentto(a)and(b),becauseiisincremented

beforetheloopbodyisexecuted.

10.[was#12]Considerthefollowingwhileloop:

while(…){

continue;

Theequivalentcodeusinggotowouldhavethefollowingappearance:

while(…){

gotoloop_end;

???

loop_end:;/*nullstatement*/

)

12.[was#14]

for(d=2;d*d<=n;d-+)

if(n%d==0)

break;

Theifstatementthatfollowstheloopwillneedtobemodifiedaswell:

if(d*d<=n)

printf(zz%disdivisibleby%d\n〃，n,d);

else

printf(〃%disprime\n〃，n);

14.[was#16]Theproblemisthesemicolonattheendofthefirstline.

Ifweremoveit,thestatementisnowcorrect:

if(n%2二二0)

printf(^niseven\n〃)；

AnswerstoSelectedProgrammingProjects

2.[was#2]

ffinclude<stdio.h>

intmain(void)

(

intm,n,remainder;

printf("Entertwointegers:〃)；

scanf(〃%d%d”,&m,&n);

while(n!=0){

remainder=m%n;

m=n;

n二remainder;

)

printf(^Greatestcommondivisor:%d\nz，,m);

return0;

)

4.[was#41

ffinclude<stdio.h>

intmain(void)

(

floatcommission,value;

printf(Z/Entervalueoftrade:");

scanf(〃%f”,lvalue);

while(value!=0.Of){

if(value<2500.OOf)

commission二30.OOf+.017f*value;

elseif(value<6250.OOf)

commission二56.OOf+.0066f*value;

elseif(value<20000.OOf)

commission二76.OOf+.0034f*value;

elseif(value<50000.OOf)

commission=100.OOf+.0022f*value;

elseif(value<500000.OOf)

commission=155.OOf+.OOllf*value;

else

commission=255.OOf+.0009f*value;

if(commission<39.OOf)

commission=39.OOf:

printf(''Commission:$%.2f\n\n〃，commission)

printf(/zEntervalueoftrade:〃)；

scanf(zz%fz/,&value);

return0;

)

6.[was#6]

^include<stdio.h>

intmain(void)

(

inti,n;

printf(^Enterlimitonmaximumsquare:〃)；

scanf&n);

for(i=2;i*i<=n;i+=2)

printf(〃％d\n〃，i*i);

return0;

}

8.[was#8]

#include<stdio.h>

intmain(void)

(

inti,n,start_day;

printf("Enternumberofdaysinmonth:〃)；

scanf&n);

printf("Enterstartingdayoftheweek(l=Sun,7=Sat):〃)；

scanf(〃/d〃，&start_day);

/*printanyleading"blankdates"*/

for(i=1;i<start_day;i++)

printfC〃)；

/*nowprintthecalendar*/

for(i=1;i<=n;i++){

printf("%3d〃，i);

if((start_day+i-1)%7—0)

printf(〃\n〃)；

)

return0;

Chapter7

AnswerstoSelectedExercises

3.[was#4](b)isnotlegal.

4.[was#61(d)isillegal,sinceprintfrequiresastring,notacharacter,

asitsfirstargument.

10.[was#14]unsignedint,becausethe(int)castappliesonlytoj,not

j*k.

12.[was#16]Thevalueofiisconvertedtofloatandaddedtof,then

theresultisconvertedtodoubleandstoredind.

14.[was#18]No.Convertingftointwillfailifthevaluestoredin

fexceedsthelargestvalueoftypeint.

AnswerstoSelectedProgrammingProjects

1.[was#2]shortintvaluesareusuallystoredin16bits,causingfailure

at182.intandlongintvaluesareusuallystoredin32bits,withfailure

occurringat46341.

2.[was#8]

#include<stdio.h>

intmain(void)

(

inti,n;

charch;

printf("Thisprogramprintsatableofsquares.\n，z);

printf("Enternumberofentriesintable:〃)；

scanf(/z%d/z,&n);

ch=getchar();

/*disposeofnew-linecharacterfollowingnumberofentries*/

/*couldsimplybegetchar();*/

for(i=1;i<=n;i++){

printf(，，%10d%10d\n，/,i,i*i);

if(i%24=0){

printf("PressEntertocontinue…〃)；

ch=getchar();/*orsimplygetchar();*/

}

return0;

}

5.[was#10]

ttinclude<ctype.h>

itinclude<stdio.h>

intmain(void)

(

intsum=0;

charch;

printf("Enteraword:〃)；

while((ch=getchar())!='\n')

switch(toupper(ch)){

case'D':case'G':

sum+=2;break;

case'B':case'C':case'M':case'P':

sum+=3;break;

case'F':case'H':case'V':case'W':case'Y':

sum+=4;break;

case'K':

sum+=5;break;

case'J,:case'X':

sum+=8;break;

case'Q':case'Z':

sum+=10;break;

default:

sum++;break;

)

printf(^Scrabblevalue:%d\n，z,sum);

return0;

}

6.[was#12]

#include<stdio.h>

intmain(void)

printf("Sizeofint:%d\n〃，(int)sizeof(int));

printf(，zSizeofshort:%d\n/z,(int)sizeof(short));

printf("Sizeoflong:%d\n，z,(int)sizeof(long));

printf("Sizeoffloat:%d\n/z,(int)sizeof(float));

printf("Sizeofdouble:%d\n〃，(int)sizeof(double));

printf("Sizeoflongdouble:刎\n〃，(int)sizeof(longdouble));

return0;

}

Sincethetypeofasizeofexpressionmayvaryfromoneimplementation

toanother,it'snecessaryinC89tocastsizeofexpressionstoaknown

typebeforeprintingthem.Thesizesofthebasictypesaresmallnumbers,

soit'ssafetocastthemtoint.(Ingeneral,however,it'sbesttocast

sizeofexpressionstounsignedlongandprintthemusing%lu.)InC99,

wecanavoidthecastbyusingthe%zuconversionspecification.

Chapter8

AnswerstoSelectedExercises

1.[was#4]Theproblemwithsizeof(a)/sizeof(t)isthatitcan'teasily

becheckedforcorrectnessbysomeonereadingtheprogram.(Thereader

wouldhavetolocatethedeclarationofaandmakesurethatitselements

havetypet.)

2.[was#8]Touseadigitd(incharacterform)asasubscriptintothe

arraya,wewouldwritea[d-，0*].Thisassumesthatdigitshave

consecutivecodesintheunderlyingcharacterset,whichistrueofASCII

andotherpopularcharactersets.

7.[was#1。]

constintsegments[10][7]:{{1,1,1,1,1,1),

(0,1,1),

{1,1,0,1,1,o,1},

{1,1,1,1,0,0,1),

{o,1,I,0,0,1,1),

{1,0,1,1,0,1,1},

{1,0,1,1,1,1,1},

{1,1,1),

(1,1,1,1,1,1,1),

{1,1,1,1,0,1,1))

AnswerstoSelectedProgrammingProjects

2.[was#21

#include<stdio.h>

intmain(void)

(

intdigit_count[10]={0};

intdigit;

longn;

printf(/zEnteranumber:〃)；

scanf(〃％ld”,&n);

while(n>0){

digit=n%10;

digit_count[digit]++;

n/-10;

)

printf("Digit:〃)；

for(digit=0;digit<=9;digit++)

printf(線3d”,digit);

printf(〃\nOccurrences:〃)；

for(digit=0;digit<=9;digit++)

printf(，z%3dzz,digit_count[digit]);

printfCXn");

return0;

)

5.[was#6]

ttinclude<stdio.h>

ftdefineNUM_RATES((int)(sizeof(value)/sizeof(value[0])))

^defineINITIAL_BALANCE100.00

intmain(void)

(

inti,low_rate,month,num_years,year;

doublevalue[5];

printf("Enterinterestrate:");

scanf(，z%d/z,&low_rate);

printf("Enternumberofyears:〃)；

scanf&num_years);

printf(〃\nYears");

for(i=0;i<NUM_RATES;i++){

printf(〃%6d%%〃，low_rate+i);

value[i]=INITIAL_BALANCE;

)

printfCAn");

for(year=1;year<=num_years;year++){

printf(z，%3d”,year);

for(i=0;i<NUM_RATES;i++){

for(month=1;month<=12;month++)

value[i]+=((double)(low_rate+i)/12)/100.0*value[i];

printf("%7.2f",value[i]);

)

printfCXn");

return0;

)

8.[was#12]

#include<stdio.h>

ftdefineNUM_QUIZZES5

#defineNUM_STUDENTS5

intmain(void)

(

intgrades[NUM_STUDENTS：[NUM_QUIZZES];

inthigh,low,quiz,student,total;

for(student=0;student<NUM_STUDENTS;student++){

printf(Z/Entergradesforstudent%d:〃，student+1);

for(quiz=0;quiz<NUM_QUIZZES;quiz++)

scanf&grades[student][quiz]);

printf(^XnStudentTotalAverage\n〃)；

for(student=0;student<NUM_STUDENTS;student++){

printf(z/%4d”,student+1);

total=0;

for(quiz=0;quiz<NUM_QUIZZES;quiz++)

total+=grades[student][quiz];

printf(/z%3d%3d\n”,total,total/NUM_QUIZZES);

printf("\nQuizAverageHighLow\n〃)；

for(quiz=0;quiz<NUM_QUIZZES;quiz++){

printf("%3d〃，quiz+1);

total=0;

high=0;

low=100;

for(student=0;student<NUM_STUDENTS;student++){

total+=grades[student][quiz];

if(grades[student][quiz]>high)

high=grades[student][quiz];

if(grades[student][quiz]<low)

low=grades[student][quiz];

)

printf("%3d%3d與3d\n〃，total/NUM_STUDENTS,high,low);

return0;

Ch叩ter9

AnswerstoSelectedExercises

2.[was#2]

intcheck(intx,inty,intn)

(

return(x>=0&&x<=n-1&&y>=0&&y<=n-1);

)

4.[was#4]

intday_of_year(intmonth,intday,intyear)

(

intnum_days[]={31,28,31,30,31,30,31,31,30,31,30,31};

intday_count=0,i;

for(i=1;i<month;i++)

day_count+=num_days[i-1];

/*adjustforleapyears,assumingtheyaredivisibleby4*/

if(year%4==0&&month>2)

day_count++;

returnday_count+day;

}

Usingtheexpressionyear%4==0totestforleapyearsisnotcompletely

correct.Centuriesarespecialcases:ifayearisamultipleof100,then

itmustalsobeamultipleof400inordertobealeapyear.Thecorrect

testis

year%4=0&&(year%100!二0||year%400==0)

6.[was#6;modified]

intdigit(intn,intk)

(

inti;

for(i=1;i<k;i++)

n/=10;

returnn%10;

)

8.[was#8](a)and(b)arevalidprototypes,(c)isillegal,sinceit

doesn,tspecifythetypeoftheparameter.(d)incorrectlyspecifiesthat

freturnsanintvalueinC89;inC99,omittingthereturntypeisillegal.

10.Lwas#10」

(a)

intlargest(inta[],intn)

(

inti,max=a[0];

for(i=1;i<n;i++)

if(a[i]>max)

max=a[i];

returnmax;

)

(b)

intaverage(inta[],intn)

(

inti,avg=0;

for(i=0;i<n;i++)

avg+=a[i];

returnavg/n;

}

(c)

intnum_positive(inta[],intn)

(

inti,count=0;

for(i=0;i<n;i++)

if(a[i]>0)

count++;

returncount;

)

15.[was#12;modified]

doublemedian(doublex,doubley,doublez)

(

doubleresult;

if(x<=y)

if(y<=z)result=y；

elseif(x<=z)result=z;

elseresult=x;

else{

if(z<=y)result二y；

elseif(x<=z)result=x;

elseresult=z;

}

returnresult;

)

17.[was#14]

intfact(intn)

(

inti,result=1;

for(i=2;i<=n;i++)

result*=i;

returnresult;

)

19.[was#161Thefollowingprogramteststhepbfunction:

ttinclude<stdio.h>

voidpb(intn);

intmain(void)

(

intn;

printf(^Enteranumber:〃)；

scanf&n);

printf("Outputofpb:〃)；

pb(n);

printf；

return0;

}

voidpb(intn)

(

if(n!=0){

pb(n/2);

putchar+n%2);

)

)

pbprintsthebinaryrepresentationoftheargumentn,assumingthatn

isgreaterthan0.(Wealsoassumethatdigitshaveconsecutivecodesin

theunderlyingcharacterset.)Forexample:

Enteranumber:53

Outputofpb:110101

Atraceofpb'sexecutionwouldlooklikethis:

pb(53)findsthat53isnotequalto0,soitcalls

pb(26),whichfindsthat26isnotequalto0,soitcalls

pb(13),whichfindsthat13isnotequalto0,soitcalls

pb(6),whichfindsthat6isnotequalto0,soitcalls

pb(3),whichfindsthat3isnotequalto0,soit

calls

pb(l),whichfindsthat1isnotequalto0,so

itcalls

pb(0),whichfindsthat0isequalto0,so

itreturns,causing

pb(l)toprint1andreturn,causing

pb(3)toprint1andreturn,causing

pb(6)toprint0andreturn,causing

pb(13)toprint1andreturn,causing

pb(26)toprint0andreturn,causing

pb(53)toprint1andreturn.

Ch叩ter10

AnswerstoSelectedExercises

1.[was#2](a)a,b,andcarevisible.

(b)a,anddarevisible.

(c)a,d,andearevisible.

(d)aandfarevisible.

AnswerstoSelectedProgrammingProjects

3.[was#4]

ttinclude<stdbool.h>/*C99only*/

#include<stdio.h>

ttinclude<stdlib.h>

^defineNUM_CARDS5

ttdefineRANK0

^defineSUIT1

/*externalvariables*/

inthand[NUM_CARDS][2];

/*01

0|_

1I—I—

2I_1_

3I1_

4I—I—

ranksuit

*/

boolstraight,flush,four,three;

intpairs;/*canbe0,1,or2*/

/*prototypes*/

voidread_cards(void);

voidanalyze_hand(void);

voidprint_result(void);

*main:Callsread_cards,analyze_hand,andprint_result*

*repeatedly.*

^|cj

intmain(void)

(

for(;;){

read_cards();

analyze_hand();

print_result();

}

)

[?)|^

*read_cards:Readsthecardsintotheexternalvariable*

*hand;checksforbadcardsandduplicate*

*cards.*

voidread_cards(void)

(

charch,rank_ch,suit_ch;

inti,rank,suit;

boolbad_card,duplicate_card;

intcards_read=0;

while(cards_read<NUM_CARDS)(

badcard=false;

printf(z，Enteracard:〃)；

rank_ch=getchar();

switch(rank_ch){

case'O'exit(EXIT_SUCCESS)

case，2'rank=0break;

case'3'rank=1break;

case，4'rank二2break;

case，5'rank=3break;

case，6'rank二4break;

，7,

caserank=5break;

caserank=6break;

case，c，rank=7break;

case't':caseTrank=8break;

9j.

case:case'J'rank二9break;

，，

caseq:case'Q'rank=10;break;

case，k':case'K'rank二11;break;

，，

casea:case'A，rank=12;break;

default:bad_(:ard二true;

)

suit_ch二getchar();

switch(suit_ch){

casec:case'C'suit=0break;

case'd':case'D'suit=1break;

case'h':case'H'suit=2break;

，，

cases:case'S':suit二3break;

default:bad_(:ard=true;

while((ch=getchar())!='\n')

if(ch!=')bad_card=true;

if(bad_card){

printf(^Badcard;ignored.\n/z);

continue;

}

duplicate_card=false;

for(i=0;i<cards_read;i++)

if(handEi][RANK]=rank&&hand[i][SUIT]==suit)

printf(^Duplicatecard;ignored.Xn^);

duplicate_card=true;

break;

if(!duplicate_card){

hand[cards_read][RANK]=rank;

hand[cards_read][SUIT]=suit;

cards_read++;

)

}

*analyze_hand:Determineswhetherthehandcontainsa*

*straight,aflush,four-of-a-kind,*

*and/orthree-of-a-kind;determinesthe*

*numberofpairs;storestheresultsinto*

*theexternalvariablesstraight,flush,*

*four,three,andpairs.*

/

voidanalyze_hand(void)

(

intrank,suit,card,pass,run;

straight=true;

flush=true;

four=false;

three=false;

pairs=0;

/*sortcardsbyrank*/

for(pass-1;pass<NUM_CARDS;pass++)

for(card=0;card<NUM_CARDS-pass;card++)

rank=hand[card][RANK];

suit=hand[card][SUIT];

if(hand[card+l][RANK]<rank){

hand[card][RANK]=hand[card+1][RANK];

hand[card][SUIT]=hand[card+1][SUIT];

hand[card+1][RANK'=rank;

hand[card+1][SUIT=suit;

)

)

/*checkforflush*/

suit=hand[0][SUIT];

for(card=1;card<NUM_CARDS;card++)

if(hand[card][SUIT]!=suit)

flush=false;

/*checkforstraight*/

for(card=0;card<NUM_CARDS-1;card++)

if(hand[card][RANK]-1!=hand[card+1][RANK])

straight=false;

/*checkfor4-of-a-kind,3-of-a-kind,andpairsby

lookingfor"runs"ofcardswithidenticalranks*/

card=0;

while(card<NUM_CARDS){

rank=hand[card][RANK];

run=0;

do{

run+4-;

card++;

}while(card<NUM_CARDS&&hand[card][RANK]==rank);

switch(run){

case2:pairs++;break;

case3:three=true;break;

case4:four=true;break;

}

}

)

*print_result:Printstheclassificationofthehand,*

*basedonthevaluesoftheexternal*

*variablesstraight,flush,four,three,*

*andpairs.*

t

voidprint_result(void)

(

if(straight&&flush)printf(^Straightflush");

elseif(four)printf("Fourofakind");

elseif(three&&

pairs==1)printf("Fullhouse");

elseif(flush)printf("Flush");

elseif(straight)printf("Straight");

elseif(three)printf("Threeofakind")

elseif(pairs==2)printf(^Twopairs");

elseif(pairs二二1)printf("Pair");

elseprintf(^Highcard");

printfC\n\nO;

)

5.[was#6]

ttinclude<stdbool.h>/*C99only*/

ttinclude<stdio.h>

ttinclude<stdlib.h>

ttdefineNUM_RANKS13

^defineNUM_SUITS4

ttdefineNUM_CARDS5

/*externalvariables*/

intnum_in_rank[NUM_R