C-Primer-Plus第6版编程练习答案(已下载)1408.pdf

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1、文档 Chapter 2 Programming Exercises PE 2-1 /*Programming Exercise 2-1 */#include int main(void)printf(Gustav Mahlern);printf(GustavnMahlern);printf(Gustav);printf(Mahlern);return 0;PE 2-3 /*Programming Exercise 2-3 */#include int main(void)int ageyears;/*age in years*/int agedays;/*age in days */*lar

2、ge ages may require the long type*/ageyears=101;agedays=365*ageyears;printf(An age of%d years is%d days.n,ageyears,agedays);return 0;PE 2-4 /*Programming Exercise 2-4 */#include void jolly(void);void deny(void);int main(void)jolly();jolly();jolly();deny();return 0;void jolly(void)printf(For hes a jo

3、lly good fellow!n);void deny(void)printf(Which nobody can deny!n);PE 2-6 /*Programming Exercise 2-6 */#include int main(void)int toes;toes=10;文档 printf(toes=%dn,toes);printf(Twice toes=%dn,2*toes);printf(toes squared=%dn,toes*toes);return 0;/*or create two more variables,set them to 2*toes and toes*

4、toes*/PE 2-8 /*Programming Exercise 2-8 */#include void one_three(void);void two(void);int main(void)printf(starting now:n);one_three();printf(done!n);return 0;void one_three(void)printf(onen);two();printf(threen);void two(void)printf(twon);Chapter 3 Programming Exercises PE 3-2 /*Programming Exerci

5、se 3-2 */#include int main(void)int ascii;printf(Enter an ASCII code:);scanf(%d,&ascii);printf(%d is the ASCII code for%c.n,ascii,ascii);return 0;PE 3-4 /*Programming Exercise 3-4 */#include int main(void)float num;printf(Enter a floating-point value:);scanf(%f,&num);printf(fixed-point notation:%fn,

6、num);printf(exponential notation:%en,num);printf(p notation:%an,num);return 0;文档 PE 3-6 /*Programming Exercise 3-6 */#include int main(void)float mass_mol=3.0e-23;/*mass of water molecule in grams*/float mass_qt=950;/*mass of quart of water in grams*/float quarts;float molecules;printf(Enter the num

7、ber of quarts of water:);scanf(%f,&quarts);molecules=quarts*mass_qt/mass_mol;printf(%f quarts of water contain%e molecules.n,quarts,molecules);return 0;Chapter 4 Programming Exercises PE 4-1 /*Programming Exercise 4-1 */#include int main(void)char fname40;char lname40;printf(Enter your first name:);

8、scanf(%s,fname);printf(Enter your last name:);scanf(%s,lname);printf(%s,%sn,lname,fname);return 0;PE 4-4 /*Programming Exercise 4-4*/#include int main(void)float height;char name40;printf(Enter your height in inches:);scanf(%f,&height);printf(Enter your name:);scanf(%s,name);printf(%s,you are%.3f fe

9、et talln,name,height/12.0);return 0;PE 4-7 /*Programming Exercise 4-7*/#include#include int main(void)文档 float ot_f=1.0/3.0;double ot_d=1.0/3.0;printf(float values:);printf(%.4f%.12f%.16fn,ot_f,ot_f,ot_f);printf(double values:);printf(%.4f%.12f%.16fn,ot_d,ot_d,ot_d);printf(FLT_DIG:%dn,FLT_DIG);print

10、f(DBL_DIG:%dn,DBL_DIG);return 0;Chapter 5 Programming Exercises PE 5-1 /*Programming Exercise 5-1*/#include int main(void)const int minperhour=60;int minutes,hours,mins;printf(Enter the number of minutes to convert:);scanf(%d,&minutes);while(minutes 0)hours=minutes/minperhour;mins=minutes%minperhour

11、;printf(%d minutes=%d hours,%d minutesn,minutes,hours,mins);printf(Enter next minutes value(0 to quit):);scanf(%d,&minutes);printf(Byen);return 0;PE 5-3 /*Programming Exercise 5-3*/#include int main(void)const int daysperweek=7;int days,weeks,day_rem;printf(Enter the number of days:);scanf(%d,&days)

12、;while(days 0)weeks=days/daysperweek;day_rem=days%daysperweek;printf(%d days are%d weeks and%d days.n,days,weeks,day_rem);printf(Enter the number of days(0 or less to end):);scanf(%d,&days);文档 printf(Done!n);return 0;PE 5-5 /*Programming Exercise 5-5*/#include int main(void)/*finds sum of first n in

13、tegers*/int count,sum;int n;printf(Enter the upper limit:);scanf(%d,&n);count=0;sum=0;while(count+n)sum=sum+count;printf(sum=%dn,sum);return 0;PE 5-7 /*Programming Exercise 5-7*/#include void showCube(double x);int main(void)/*finds cube of entered number*/double val;printf(Enter a floating-point va

14、lue:);scanf(%lf,&val);showCube(val);return 0;void showCube(double x)printf(The cube of%e is%e.n,x,x*x*x);Chapter 6 Programming Exercises PE 6-1 /*pe6-1.c*/*this implementation assumes the character codes*/*are sequential,as they are in ASCII.*/#include#define SIZE 26 int main(void)char lcaseSIZE;int

15、 i;for(i=0;i SIZE;i+)lcasei=a+i;for(i=0;i SIZE;i+)printf(%c,lcasei);printf(n);return 0;PE 6-3 /*pe6-3.c*/文档/*this implementation assumes the character codes*/*are sequential,as they are in ASCII.*/#include int main(void)char let=F;char start;char end;for(end=let;end=A;end-)for(start=let;start=end;st

16、art-)printf(%c,start);printf(n);return 0;PE 6-6 /*pe6-6.c*/#include int main(void)int lower,upper,index;int square,cube;printf(Enter starting integer:);scanf(%d,&lower);printf(Enter ending integer:);scanf(%d,&upper);printf(%5s%10s%15sn,num,square,cube);for(index=lower;index=upper;index+)square=index

17、*index;cube=index*square;printf(%5d%10d%15dn,index,square,cube);return 0;PE 6-8 /*pe6-8.c*/#include int main(void)double n,m;double res;printf(Enter a pair of numbers:);while(scanf(%lf%lf,&n,&m)=2)res=(n-m)/(n*m);printf(%.3g-%.3g)/(%.3g*%.3g)=%.5gn,n,m,n,m,res);printf(Enter next pair(non-numeric to

18、quit):);return 0;文档 PE 6-11 /*pe6-11.c*/#include#define SIZE 8 int main(void)int valsSIZE;int i;printf(Please enter%d integers.n,SIZE);for(i=0;i=0;i-)printf(%d,valsi);printf(n);return 0;PE 6-13 /*pe6-13.c*/*This version starts with the 0 power*/#include#define SIZE 8 int main(void)int twopowsSIZE;in

19、t i;int value=1;/*2 to the 0*/for(i=0;i SIZE;i+)twopowsi=value;value*=2;i=0;do printf(%d,twopowsi);i+;while(i SIZE);printf(n);return 0;PE 6-14 /*pe-14.c*/*Programming Exercise 6-14*/#include#define SIZE 8 int main(void)double arrSIZE;double arr_cumulSIZE;int i;printf(Enter%d numbers:n,SIZE);for(i=0;

20、i SIZE;i+)printf(value#%d:,i+1);scanf(%lf,&arri);/*or scanf(%lf,arr+i);*/文档 arr_cumul0=arr0;/*set first element*/for(i=1;i SIZE;i+)arr_cumuli=arr_cumuli-1+arri;for(i=0;i SIZE;i+)printf(%8g,arri);printf(n);for(i=0;i SIZE;i+)printf(%8g,arr_cumuli);printf(n);return 0;PE 6-16 /*pe6-16.c*/#include#define

21、 RATE_SIMP 0.10#define RATE_COMP 0.05#define INIT_AMT 100.0 int main(void)double daphne=INIT_AMT;double deidre=INIT_AMT;int years=0;while(deidre=daphne)daphne+=RATE_SIMP*INIT_AMT;deidre+=RATE_COMP*deidre;+years;printf(Investment values after%d years:n,years);printf(Daphne:$%.2fn,daphne);printf(Deidr

22、e:$%.2fn,deidre);return 0;Chapter 7 Programming Exercises PE 7-1 /*Programming Exercise 7-1*/#include int main(void)char ch;int sp_ct=0;int nl_ct=0;int other=0;while(ch=getchar()!=#)if(ch=)sp_ct+;else if(ch=n)nl_ct+;else other+;printf(spaces:%d,newlines:%d,others:%dn,sp_ct,nl_ct,other);文档 return 0;P

23、E 7-3 /*Programming Exercise 7-3*/#include int main(void)int n;double sumeven=0.0;int ct_even=0;double sumodd=0.0;int ct_odd=0;while(scanf(%d,&n)=1&n!=0)if(n%2=0)sumeven+=n;+ct_even;else /n%2 is either 1 or-1 sumodd+=n;+ct_odd;printf(Number of evens:%d,ct_even);if(ct_even 0)printf(average:%g,sumeven

24、/ct_even);putchar(n);printf(Number of odds:%d,ct_odd);if(ct_odd 0)printf(average:%g,sumodd/ct_odd);putchar(n);printf(ndonen);return 0;PE 7-5 /*Programming Exercise 7-5*/#include int main(void)char ch;int ct1=0;int ct2=0;while(ch=getchar()!=#)switch(ch)case.:putchar(!);+ct1;break;case!:putchar(!);put

25、char(!);文档+ct2;break;default :putchar(ch);printf(%d replacement(s)of.with!n,ct1);printf(%d replacement(s)of!with!n,ct2);return 0;PE 7-7 /Programming Exercise 7-7#include#define BASEPAY 10 /$10 per hour#define BASEHRS 40 /hours at basepay#define OVERTIME 1.5 /1.5 time#define AMT1 300 /1st rate tier#d

26、efine AMT2 150 /2st rate tier#define RATE1 0.15 /rate for 1st tier#define RATE2 0.20 /rate for 2nd tier#define RATE3 0.25 /rate for 3rd tier int main(void)double hours;double gross;double net;double taxes;printf(Enter the number of hours worked this week:);scanf(%lf,&hours);if(hours=BASEHRS)gross=ho

27、urs*BASEPAY;else gross=BASEHRS*BASEPAY+(hours-BASEHRS)*BASEPAY*OVERTIME;if(gross=AMT1)taxes=gross*RATE1;else if(gross=AMT1+AMT2)taxes=AMT1*RATE1+(gross-AMT1)*RATE2;else taxes=AMT1*RATE1+AMT2*RATE2+(gross-AMT1-AMT2)*RATE3;net=gross-taxes;printf(gross:$%.2f;taxes:$%.2f;net:$%.2fn,gross,taxes,net);retu

28、rn 0;PE 7-9 /*Programming Exercise 7-9*/#include#include int main(void)int limit;int num;int div;bool numIsPrime;/use int if stdbool.h not available printf(Enter a positive integer:);while(scanf(%d,&limit)=1&limit 0)文档 if(limit 1)printf(Here are the prime numbers up through%dn,limit);else printf(No

29、primes.n);for(num=2;num=limit;num+)for(div=2,numIsPrime=true;(div*div)=num;div+)if(num%div=0)numIsPrime=false;if(numIsPrime)printf(%d is prime.n,num);printf(Enter a positive integer(q to quit):);printf(Done!n);return 0;PE 7-11 /*pe7-11.c*/*Programming Exercise 7-11*/#include#include int main(void)co

30、nst double price_artichokes=2.05;const double price_beets=1.15;const double price_carrots=1.09;const double DISCOUNT_RATE=0.05;const double under5=6.50;const double under20=14.00;const double base20=14.00;const double extralb=0.50;char ch;double lb_artichokes=0;double lb_beets=0;double lb_carrots=0;

31、double lb_temp;double lb_total;double cost_artichokes;double cost_beets;double cost_carrots;double cost_total;double final_total;double discount;double shipping;printf(Enter a to buy artichokes,b for beets,);printf(c for carrots,q to quit:);while(ch=getchar()!=q&ch!=Q)if(ch=n)continue;while(getchar(

32、)!=n)continue;ch=tolower(ch);switch(ch)case a:printf(Enter pounds of artichokes:);scanf(%lf,&lb_temp);lb_artichokes+=lb_temp;break;文档 case b:printf(Enter pounds of beets:);scanf(%lf,&lb_temp);lb_beets+=lb_temp;break;case c:printf(Enter pounds of carrots:);scanf(%lf,&lb_temp);lb_carrots+=lb_temp;brea

33、k;default :printf(%c is not a valid choice.n,ch);printf(Enter a to buy artichokes,b for beets,);printf(c for carrots,q to quit:);cost_artichokes=price_artichokes*lb_artichokes;cost_beets=price_beets*lb_beets;cost_carrots=price_carrots*lb_carrots;cost_total=cost_artichokes+cost_beets+cost_carrots;lb_

34、total=lb_artichokes+lb_beets+lb_carrots;if(lb_total=0)shipping=0.0;else if(lb_total 5.0)shipping=under5;else if(lb_total 100.0)discount=DISCOUNT_RATE*cost_total;else discount=0.0;final_total=cost_total+shipping-discount;printf(Your order:n);printf(%.2f lbs of artichokes at$%.2f per pound:$%.2fn,lb_a

35、rtichokes,price_artichokes,cost_artichokes);printf(%.2f lbs of beets at$%.2f per pound:$%.2fn,lb_beets,price_beets,cost_beets);printf(%.2f lbs of carrots at$%.2f per pound:$%.2fn,lb_carrots,price_carrots,cost_carrots);printf(Total cost of vegetables:$%.2fn,cost_total);if(cost_total 100)printf(Volume

36、 discount:$%.2fn,discount);printf(Shipping:$%.2fn,shipping);printf(Total charges:$%.2fn,final_total);return 0;Chapter 8 Programming Exercises PE 8-1 /*Programming Exercise 8-1*/#include int main(void)int ch;int ct=0;while(ch=getchar()!=EOF)ct+;printf(%d characters readn,ct);return 0;PE 8-3 /*Program

37、ming Exercise 8-3*/*Using ctype.h eliminates need to assume consecutive coding*/#include#include int main(void)int ch;文档 unsigned long uct=0;unsigned long lct=0;unsigned long oct=0;while(ch=getchar()!=EOF)if(isupper(ch)uct+;else if(islower(ch)lct+;else oct+;printf(%lu uppercase characters readn,uct)

38、;printf(%lu lowercase characters readn,lct);printf(%lu other characters readn,oct);return 0;/*or you could use if(ch=A&ch=a&ch=z)lct+;else oct+;*/PE 8-5 /*Programming Exercise 8-5*/*binaryguess.c-an improved number-guesser*/*but relies upon truthful,correct responses*/#include#include int main(void)

39、int high=100;int low=1;int guess=(high+low)/2;char response;printf(Pick an integer from 1 to 100.I will try to guess);printf(it.nRespond with a y if my guess is right,with);printf(na h if it is high,and with an l if it is low.n);printf(Uh.is your number%d?n,guess);while(response=getchar()!=y)/*get r

40、esponse*/if(response=n)continue;if(response!=h&response!=l)printf(I dont understand that response.Please enter h forn);printf(high,l for low,or y for correct.n);continue;if(response=h)high=guess-1;else if(response=l)low=guess+1;guess=(high+low)/2;printf(Well,then,is it%d?n,guess);printf(I knew I cou

41、ld do it!n);return 0;PE 8-7 /*Programming Exercise 8-7*/文档#include#include#include#define BASEPAY1 8.75 /$8.75 per hour#define BASEPAY2 9.33 /$9.33 per hour#define BASEPAY3 10.00 /$10.00 per hour#define BASEPAY4 11.20 /$11.20 per hour#define BASEHRS 40 /hours at basepay#define OVERTIME 1.5 /1.5 time

42、#define AMT1 300 /1st rate tier#define AMT2 150 /2st rate tier#define RATE1 0.15 /rate for 1st tier#define RATE2 0.20 /rate for 2nd tier#define RATE3 0.25 /rate for 3rd tier int getfirst(void);void menu(void);int main(void)double hours;double gross;double net;double taxes;double pay;char response;me

43、nu();while(response=getfirst()!=q)if(response=n)/*skip over newlines */continue;response=tolower(response);/*accept A as a,etc.*/switch(response)case a:pay=BASEPAY1;break;case b:pay=BASEPAY2;break;case c:pay=BASEPAY3;break;case d:pay=BASEPAY4;break;default:printf(Please enter a,b,c,d,or q.n);menu();

44、continue;/go to beginning of loop printf(Enter the number of hours worked this week:);scanf(%lf,&hours);if(hours=BASEHRS)gross=hours*pay;else gross=BASEHRS*pay+(hours-BASEHRS)*pay*OVERTIME;if(gross=AMT1)taxes=gross*RATE1;else if(gross=AMT1+AMT2)taxes=AMT1*RATE1+(gross-AMT1)*RATE2;else taxes=AMT1*RAT

45、E1+AMT2*RATE2+(gross-AMT1-AMT2)*RATE3;net=gross-taxes;printf(gross:$%.2f;taxes:$%.2f;net:$%.2fn,gross,taxes,net);menu();printf(Done.n);return 0;void menu(void)printf(*n);文档 printf(Enter the letter corresponding to the desired pay rate or action:n);printf(a)$%4.2f/hr b)$%4.2f/hrn,BASEPAY1,BASEPAY2);p

46、rintf(c)$%5.2f/hr d)$%5.2f/hrn,BASEPAY3,BASEPAY4);printf(q)quitn);printf(*n);int getfirst(void)int ch;ch=getchar();while(isspace(ch)ch=getchar();while(getchar()!=n)continue;return ch;Chapter 9 Programming Exercises PE 9-1 /*Programming Exercise 9-1*/#include double min(double,double);int main(void)d

47、ouble x,y;printf(Enter two numbers(q to quit):);while(scanf(%lf%lf,&x,&y)=2)printf(The smaller number is%f.n,min(x,y);printf(Next two values(q to quit):);printf(Bye!n);return 0;double min(double a,double b)return a b?a:b;/*alternative implementation double min(double a,double b)if(a b)return a;else

48、return b;*/文档 PE 9-3 /*Programming Exercise 9-3*/#include void chLineRow(char ch,int c,int r);int main(void)char ch;int col,row;printf(Enter a character(#to quit):);while(ch=getchar()!=#)if(ch=n)continue;printf(Enter number of columns and number of rows:);if(scanf(%d%d,&col,&row)!=2)break;chLineRow(

49、ch,col,row);printf(nEnter next character(#to quit):);printf(Bye!n);return 0;/start rows and cols at 0 void chLineRow(char ch,int c,int r)int col,row;for(row=0;row r;row+)for(col=0;col c;col+)putchar(ch);putchar(n);return;PE 9-5 /*Programming Exercise 9-5*/#include void larger_of(double*p1,double*p2)

50、;int main(void)double x,y;printf(Enter two numbers(q to quit):);while(scanf(%lf%lf,&x,&y)=2)larger_of(&x,&y);printf(The modified values are%f and%f.n,x,y);printf(Next two values(q to quit):);printf(Bye!n);return 0;void larger_of(double*p1,double*p2)if(*p1 *p2)*p2=文档*p1;else *p1=*p2;/alternatively:/*