C Primer Plus第6版编程练习答案已.docx

C Primer Plus第6版编程练习答案已.docx

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CPrimerPlus第6版编程练习答案已

Chapter2ProgrammingExercises

PE2-‐1

/*ProgrammingExercise2-1*/

#includeintmain（void）

{printf（"GustavMahler\n"）;printf（"Gustav\nMahler\n"）;printf（"Gustav"）;printf（"Mahler\n"）;return0;

}

PE2-‐3

/*ProgrammingExercise2-3*/

#includeintmain（void）

{intageyears;/*ageinyears*/intagedays;/*ageindays*/

/*largeagesmayrequirethelongtype*/ageyears=101;agedays=365*ageyears;

printf（"Anageof%dyearsis%ddays.\n",ageyears,agedays）;return0;

}

PE2-‐4

/*ProgrammingExercise2-4*/

#includevoidjolly（void）;voiddeny（void）;intmain（void）

{jolly（）;jolly（）;jolly（）;deny（）;return0;}

voidjolly（void）

{

printf（"Forhe'sajollygoodfellow!

\n"）;

}

voiddeny（void）

{

printf（"Whichnobodycandeny!

\n"）;

}

PE2-‐6

/*ProgrammingExercise2-6*/

#includeintmain（void）

{inttoes;toes=10;

printf（"toes=%d\n",toes）;

printf（"Twicetoes=%d\n",2*toes）;printf（"toessquared=%d\n",toes*toes）;return0;

}

/*orcreatetwomorevariables,setthemto2*toesandtoes*toes*/

PE2-‐8

/*ProgrammingExercise2-8*/

#includevoidone_three（void）;voidtwo（void）;intmain（void）

{

printf（"startingnow:

\n"）;one_three（）;printf（"done!

\n"）;return0;

}

voidone_three（void）

{

printf（"one\n"）;two（）;

printf（"three\n"）;

}

voidtwo（void）

{

printf（"two\n"）;

}

Chapter3ProgrammingExercises

PE3-‐2

/*ProgrammingExercise3-2*/

#includeintmain（void）

{

intascii;

printf（"EnteranASCIIcode:

"）;scanf（"%d",&ascii）;

printf（"%distheASCIIcodefor%c.\n",ascii,ascii）;return0;

}

PE3-‐4

/*ProgrammingExercise3-4*/

#includeintmain（void）

{floatnum;

printf（"Enterafloating-pointvalue:

"）;scanf（"%f",&num）;

printf（"fixed-pointnotation:

%f\n",num）;printf（"exponentialnotation:

%e\n",num）;printf（"pnotation:

%a\n",num）;return0;

}

PE3-‐6

/*ProgrammingExercise3-6*/

#includeintmain（void）

{

floatmass_mol=3.0e-23;/*massofwatermoleculeingrams*/floatmass_qt=950;/*massofquartofwateringrams*/floatquarts;floatmolecules;

printf（"Enterthenumberofquartsofwater:

"）;scanf（"%f",&quarts）;

molecules=quarts*mass_qt/mass_mol;

printf（"%fquartsofwatercontain%emolecules.\n",quarts,molecules）;return0;

}

Chapter4ProgrammingExercises

PE4-‐1

/*ProgrammingExercise4-1*/

#includeintmain（void）

{charfname[40];charlname[40];

printf（"Enteryourfirstname:

"）;scanf（"%s",fname）;printf（"Enteryourlastname:

"）;scanf（"%s",lname）;printf（"%s,%s\n",lname,fname）;return0;

}

PE4-‐4

/*ProgrammingExercise4-4*/

#includeintmain（void）

{floatheight;charname[40];

printf（"Enteryourheightininches:

"）;scanf（"%f",&height）;printf（"Enteryourname:

"）;scanf（"%s",name）;

printf（"%s,youare%.3ffeettall\n",name,height/12.0）;

return0;

}

PE4-‐7

/*ProgrammingExercise4-7*/

#include#includeintmain（void）

{floatot_f=1.0/3.0;doubleot_d=1.0/3.0;printf（"floatvalues:

"）;

printf（"%.4f%.12f%.16f\n",ot_f,ot_f,ot_f）;printf（"doublevalues:

"）;

printf（"%.4f%.12f%.16f\n",ot_d,ot_d,ot_d）;printf（"FLT_DIG:

%d\n",FLT_DIG）;printf（"DBL_DIG:

%d\n",DBL_DIG）;return0;

}

Chapter5ProgrammingExercises

PE5-‐1

/*ProgrammingExercise5-1*/

#includeintmain（void）

{constintminperhour=60;intminutes,hours,mins;

printf（"Enterthenumberofminutestoconvert:

"）;scanf（"%d",&minutes）;while（minutes>0）

{hours=minutes/minperhour;mins=minutes%minperhour;

printf（"%dminutes=%dhours,%dminutes\n",minutes,hours,mins）;printf（"Enternextminutesvalue（0toquit）:

"）;scanf（"%d",&minutes）;

}

printf（"Bye\n"）;

return0;

}

PE5-‐3

/*ProgrammingExercise5-3*/

#includeintmain（void）

{constintdaysperweek=7;intdays,weeks,day_rem;

printf（"Enterthenumberofdays:

"）;scanf（"%d",&days）;while（days>0）

{weeks=days/daysperweek;day_rem=days%daysperweek;

printf（"%ddaysare%dweeksand%ddays.\n",days,weeks,day_rem）;

printf（"Enterthenumberofdays（0orlesstoend）:

"）;scanf（"%d",&days）;

}

printf（"Done!

\n"）;return0;

}

PE5-‐5

/*ProgrammingExercise5-5*/#include

intmain（void）/*findssumoffirstnintegers*/

{

intcount,sum;intn;

printf（"Entertheupperlimit:

"）;scanf（"%d",&n）;count=0;sum=0;while（count++

}

PE5-‐7

/*ProgrammingExercise5-7*/#includevoidshowCube（doublex）;

intmain（void）/*findscubeofenterednumber*/

{doubleval;

printf（"Enterafloating-pointvalue:

"）;scanf（"%lf",&val）;showCube（val）;return0;}

voidshowCube（doublex）

{

printf（"Thecubeof%eis%e.\n",x,x*x*x）;

}

Chapter6ProgrammingExercises

PE6-‐1

/*pe6-1.c*/

/*thisimplementationassumesthecharactercodes*/

/*aresequential,astheyareinASCII.*/

#include#defineSIZE26intmain（void）{charlcase[SIZE];inti;for（i=0;i

}

PE6-‐3

/*pe6-3.c*/

/*thisimplementationassumesthecharactercodes*/

/*aresequential,astheyareinASCII.*/

#includeintmain（void）

{charlet='F';charstart;charend;

for（end=let;end>='A';end--）

{

for（start=let;start>=end;start--）printf（"%c",start）;printf（"\n"）;

}return0;

}

PE6-‐6

/*pe6-6.c*/#includeintmain（void）

{intlower,upper,index;intsquare,cube;

printf（"Enterstartinginteger:

"）;scanf（"%d",&lower）;printf（"Enterendinginteger:

"）;scanf（"%d",&upper）;

printf（"%5s%10s%15s\n","num","square","cube"）;for（index=lower;index<=upper;index++）

{square=index*index;cube=index*square;

printf（"%5d%10d%15d\n",index,square,cube）;

}return0;

}

PE6-‐8

/*pe6-8.c*/#includeintmain（void）

{doublen,m;doubleres;

printf（"Enterapairofnumbers:

"）;

while（scanf（"%lf%lf",&n,&m）==2）

{

res=（n-m）/（n*m）;

printf（"（%.3g-%.3g）/（%.3g*%.3g）=%.5g\n",n,m,n,m,res）;printf（"Enternextpair（non-numerictoquit）:

"）;

}

return0;

}

PE6-‐11

/*pe6-11.c*/

#include#defineSIZE8intmain（void）

{intvals[SIZE];inti;

printf（"Pleaseenter%dintegers.\n",SIZE）;for（i=0;i

printf（"Here,inreverseorder,arethevaluesyouentered:

\n"）;for（i=SIZE-1;i>=0;i--）printf（"%d",vals[i]）;printf（"\n"）;return0;

}

PE6-‐13

/*pe6-13.c*/

/*Thisversionstartswiththe0power*/

#include#defineSIZE8intmain（void）

{

inttwopows[SIZE];inti;

intvalue=1;/*2tothe0*/

for（i=0;i

{twopows[i]=value;value*=2;

}i=0;do{

printf（"%d",twopows[i]）;i++;}while（i

}

PE6-‐14

/*pe-14.c*/

/*ProgrammingExercise6-14*/

#include#defineSIZE8intmain（void）

{doublearr[SIZE];doublearr_cumul[SIZE];inti;

printf（"Enter%dnumbers:

\n",SIZE）;

for（i=0;i

{

printf（"value#%d:

",i+1）;scanf（"%lf",&arr[i]）;/*orscanf（"%lf",arr+i）;*/

}

arr_cumul[0]=arr[0];/*setfirstelement*/for（i=1;i

arr_cumul[i]=arr_cumul[i-1]+arr[i];

for（i=0;i

}

PE6-‐16

/*pe6-16.c*/

#include

#defineRATE_SIMP0.10

#defineRATE_COMP0.05#defineINIT_AMT100.0intmain（void）

{

doubledaphne=INIT_AMT;doubledeidre=INIT_AMT;intyears=0;

while（deidre<=daphne）

{daphne+=RATE_SIMP*INIT_AMT;deidre+=RATE_COMP*deidre;

++years;}

printf（"Investmentvaluesafter%dyears:

\n",years）;printf（"Daphne:

$%.2f\n",daphne）;printf（"Deidre:

$%.2f\n",deidre）;return0;

}

Chapter7ProgrammingExercises

PE7-‐1

/*ProgrammingExercise7-1*/#includeintmain（void）

{charch;intsp_ct=0;intnl_ct=0;intother=0;while（（ch=getchar（））!

='#'）

{

if（ch==''）sp_ct++;elseif（ch=='\n'）nl_ct++;elseother++;

}

printf（"spaces:

%d,newlines:

%d,others:

%d\n",sp_ct,nl_ct,other）;

return0;

}

PE7-‐3

/*ProgrammingExercise7-3*/

#includeintmain（void）

{intn;doublesumeven=0.0;intct_even=0;doublesumodd=0.0;intct_odd=0;

while（scanf（"%d",&n）==1&&n!

=0）

{

if（n%2==0）

{

sumeven+=n;

++ct_even;

}

else//n%2iseither1or-1

{

sumodd+=n;

++ct_odd;

}}

printf（"Numberofevens:

%d",ct_even）;if（ct_even>0）

printf（"average:

%g",sumeven/ct_even）;putchar（'\n'）;

printf（"Numberofodds:

%d",ct_odd）;if（ct_odd>0）

printf（"average:

%g",sumodd/ct_odd）;putchar（'\n'）;printf（"\ndone\n"）;

return0;

}

PE7-‐5

/*ProgrammingExercise7-5*/

#includeintmain（void）

{charch;intct1=0;intct2=0;while（（ch=getchar（））!

='#'）

{

switch（ch）{

case'.':

putchar（'!

'）;++ct1;break;case'!

':

putchar（'!

'）;putchar（'!

'）;++ct2;break;default:

putchar（ch）;

}}

printf（"%dreplacement（s）of.with!

\n",ct1）;printf（"%dreplacement（s）of!

with!

!

\n",ct2）;

return0;

}

PE7-‐7

//ProgrammingExercise7-7

#include

#defineBASEPAY10//$10perhour

#defineBASEHRS40//hoursatbasepay