C语言程序设计何钦铭课后习题作业

CCPAGEPAGE51/51第一章习题1、对C语言来说，下列标示符中哪些是合法的，哪些是不合法的Total, _debug, Large＆Tall, Counter1, begin_答：合法的：_debug、Counter1、begin_。不合法的：Total、Large＆Tall。21.41.21—1006Sum=0,i=1Sum=0,i=1I<=100真I能被6整除？假sum=sum+ii=i+1sum31.41—1006并在编程环境中验证该程序的运行结果。答：程序为：#include<stdio.h>intmain(void){inti,sum=0;for(i=1;i<=100;i++)if(i%6==0)sum=sum+i;printf("sum=%d\n",sum);return0;}4n>1n是否为一个素数（只能被1和自己整除的整数结构、哪些是分支结构和循环结构。开始开始ni=2r=n/i的余数真r=0？假i=i+1输出n假i>=(n-1)真输出n“是素数”结束开始开始ni=2r=n/i的余数真r=0？假i=i+1输出n假i>=(n-1)真输出n“是素数”结束第二章作业num答：程序：#include<stdio.h>voidmain(){intnum1,num2,y1,y2,y3,y5;doubley4;printf("请输入两个数：num1,num2\n");scanf("%d%d",&num1,&num2);y1=num1+num2;y2=num1-num2;y3=num1*num2;y4=num1*1.0/num2;y5=num1%num2;printf("num1,num2 y2=%d\nnum1,num2 积

y1=%d\nnum1,num2 y3=%d\nnum1,num2 商y4=%lf\nnum1,num2余y5=%d\n",y1,y2,y3,y4,y5);}为了倡导居民节约用电，某省电力公司执行“阶梯电价户一表的居民用户电价分为两个“阶梯50千瓦时以内的，电价为0.53元/千瓦时；超出50千瓦时的用电量，电价上调0.05元千瓦时。编写程序，输入用户的月用电量（千瓦时并输出该用户应支付的电费（元。答：程序：#include<stdio.h>voidmain(){doublex,y;printf("请输入月用电量：x\n");scanf("%lf",&x);if(x<=50){y=0.53*x;printf("电费y=%lf\n",y);}else{y=0.58*x;printf("应支付电费y=%lf\n",y);}}x和正整数函数求幂。答：程序：#include<stdio.h>voidmain(){doublex,power;inti,n;printf("请输入：x,n\n");scanf("%lf%d",&x,&n);power=1.0;for(i=1;i<=n;i++)power=power*x;printf("power（x,n）=%lf\n",power);}m和（+1/（i从m到）答：程序：#include<stdio.h>voidmain(){inti,m,n;doublesum;sum=0;printf("input:m,n\n");scanf("%d%d",&m,&n);for(i=m;i<=n;i++)sum=sum+(i*i+1.0/i);printf("sum=%lf\n",sum);}5．编写程序，输入一个正整数1-2/3+3/5-4/7+5/9-6/11+…的前n项之和。答：程序：#include<stdio.h>voidmain(){

n，计算inti,n;doublesum,item,flag;flag=1;sum=0;printf("input:n\n");scanf("%d",&n);for(i=1;i<=n;i++){item=(flag*i)/(2*i-1);flag=-flag;sum=sum+item; }printf("sum=%lf\n",sum);}某用户为购房办理商业贷款，选择了按月等额本息还款法，计算公式如下，在贷款本金和月利率房贷款的月还款（money）取决于还款月数（month）。客户打算在5—30loan和月利率rat，输出“还款年限—月还款额表5—30答：程序：#include<stdio.h>#include<math.h>voidmain(){intlower,upper,month,year,loan;doublemoney,rate;lower=5;upper=30;:loan\n");scanf("%d",&loan);:rate\n");scanf("%lf",&rate);printf("还款年限\t月还款额\n");for(year=lower;year<=upper;year++){month=year*12;money=(loan*rate*pow((1+rate),month))/(pow((1+rate),month)-1);printf("%d\t\t%lf\n",year,money);}}i（）答：程序：#include<stdio.h>#include<math.h>voidmain(){

i从1到powinti,n;doublesum,item;sum=0;printf("input:n\n");scanf("%d",&n);for(i=0;i<=n;i++){item=pow(2,i);sum=sum+item;}printf("sum=%lf\n",sum);}编写程序，输入一个正整数，求e∑ii从0到n义和调用函数fact(n)计算n!，函数类型是double.答：程序：#include<stdio.h>doublefact(intn);voidmain(){inti,n;doublesum;sum=0;printf("input:n\n");scanf("%d",&n);for(i=0;i<=n;i++){sum=sum+fact(i);}printf("sun=%lf\n",sum);}doublefact(intn){inti;doubleproduct;product=1.0;for(i=1;i<=n;i++){product=product*i;}returnproduct;}第三章作业1.#include<stdio.h>#include<math.h>voidmain(){inta,b,c;doubles,area,perimeter;printf("请输入三角形三条边：a,b,c\n");scanf("%d%d%d",&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a){perimeter=a+b+c;s=(a+b+c)/2.0;area=sqrt(s*(s-a)*(s-b)*(s-c));printf("三角形的周长 perimeter=%.2lf\n三角形的面area=%.2lf\n",perimeter,area);}}2、#include<stdio.h>#include<math.h>voidmain(){doublesalary,tax,rate;printf("请输入职工的月薪：salary\n");scanf("%lf",&salary);if(salary<=850)rate=0;elseif(salary<=1350)rate=5;elseif(salary<=2850)rate=10;elseif(salary<=5850)rate=15;else rate=20;tax=rate*(salary-850)/100;printf("职工应缴个人所得税tax=%.2lf\n",tax);}3、#include<stdio.h>voidmain(){doublem,n,y;printf(：m\nn\n");scanf("%lf%lf",&m,&n);if((m+n/5.0)<=3)y=10;elseif((m+n/5.0)<=10)y=2*(m+n/5.0);else y=2*10+3*(m+n/5.0-10);;printf("乘客应付车费y=%d\n",(int)((y*10+0.5)/10.0));}4、#include<stdio.h>voidmain(){inti,n,A,B,C,D,E;doublescore,total;printf("请输入一个数n：\n");scanf("%d",&n);total=0;A=0;B=0;C=0;D=0;E=0;for(i=1;i<=n;i++){printf("请输入第#%d个学生成绩：\n",i);scanf("%lf",&score);total=total+score;if(score>=90)A++;elseB++;elseC++;elseD++;elseE++;}printf("平均成绩=%lf\n",total/n);printf(" 等 级 成 绩 个 数 ：\nA=%d\nB=%d\nC=%d\nD=%d\nE=%d\n",A,B,C,D,E);}5、#include<stdio.h>voidmain(){intyear;printf("21世纪所有的闰年：\n");for(year=2000;year<3000;year++)if(year%4==0&&year%100!=0||year%400==0)printf("%d\n",year);}第四章作业2、#include"stdio.h"#include"math.h"doublefact(intn);voidmain(){inti,n;doublex,s;printf("请输入一个实数x:\n");scanf("%lf",&x);s=0;i=1;while((pow(x,i)/fact(i))>=0.00001){s=pow(x,i)*1.0/fact(i)+s;i++;}printf("s=%.2lf\n",s);}doublefact(intn){inti;doubleresult;result=1;for(i=1;i<=n;i++)result=result*i;returnresult;}3、#include"stdio.h"intmain(void){intx,a,count,sum;printf("请输入一个整数x:\n");scanf("%d",&x);sum=0;count=0;if(x<0)x=-x;do{a=x%10;sum=sum+a;x=x/10;count++;}while(x!=0);printf("位数=%d\n",count);printf("各个位数之和为:%d\n",sum);return0;}5、#include"stdio.h"voidmain(){inta,n,i=1,s=0,t=0;printf("请输入两个正整数a,n=:\n");scanf("%d%d",&a,&n);while(i<=n){t=t+a;s=s+t;a=a*10;++i;}printf("a+aa+aaa+…+aa…a=%d\n",s);}7、#include"stdio.h"voidmain(){inti,j,k,l,n;printf("1-10000之间的水仙花数有:\n");for(n=10;n<10000;n++){i=n/1000;j=n/100%10;k=n/10%10;l=n%10;if(i*1000+j*100+k*10+l==i*i*i+j*j*j+k*k*k+l*l*l){printf("%-5d",n);}}printf("\n");}9、#include"stdio.h"#include"math.h"voidmain(){inti,n,m,j,k;i=0;printf("请输入一个多位整数:\n");scanf("%d",&n);k=n;while(k!=0){i++;k=k/10;}k=n;m=pow(10,i-1);printf(printf(",");for(j=m/10;j>0;j=j/10){n=k/j;printf("%d",n%10);if(j!=1)printf(",");}}11、#include"stdio.h"voidmain(){intp,r,n,m,temp;printf("请输入两个正整数:\n");scanf("%d%d",&n,&m);if(n<m){temp=n;n=m;m=temp;}p=n*m;while(m!=0){r=n%m;n=m;m=r;}printf("最大公约数为:%d\n",n);printf("最小公倍数为:%d\n",p/n);}13、#include"stdio.h"voidmain(){inti,j;for(i=0;i<=3;i++){for(j=0;j<=2-i;j++)printf("");for(j=0;j<=2*i;j++)printf("*");printf("\n");}for(i=0;i<=2;i++){for(j=0;j<=i;j++)printf("");for(j=0;j<=4-2*i;j++)printf("*");printf("\n");}}第五章1.#include<stdio.h>#include<math.h>longfac(intn,inta){longsum;if(n==1)sum=a;elsesum=(long)(pow(10,n-1)*a)+fac(n-1,a);return(sum);}main(){inta,n,i;longtemp,sum=0;printf("请输入一个数a,n\n");scanf("%d%d",&a,&n);for(i=1;i<=n;i++){temp=fac(i,a);sum+=temp;}printf("它们的和是=%ld",sum);return0;}2.#include<stdio.h>intcountdight(intnumber,intdight);intmain(void){intnumber;printf("输入一个数:");scanf("%d",&number);countdight(number,2);return0;}countdight(intnumber,intdight){inta,count;count=0;while(number!=0){a=number%10;number=number/10;if(a==dight)count++;}printf("%d\n",count);returncount;}3.#include<stdio.h>intfib(intn);intmain(void){intm,n,num1;num1=1;printf("请输入两个正整数m和n(m>=1,n<=10000)\n");scanf("%d%d",&m,&n);if(num1>=m&&num1<=n)fib(n);return0;}intfib(intn){inti,x1,x2,x,t;x1=1;x2=1;for(i=0;i<n;i++){x=x1+x2;printf("%5d",x);t=x;x1=x2;x2=t;}printf("\n");returnx;}5.#include<stdio.h>voidis(intnum);intmain(void){intn,m,num1;num1=1;printf("输入两个数m和n(m>=1,n<=1000)\n");scanf("%d%d",&m,&n);if(num1>=m&&num1<=n)is(num1);return0;}voidis(intnum){inti,j,k;for(num=1;num<1000;num++){i=num/100;j=num/10%10;k=num%10;if(i*100+j*10+k*1==i*i*i+j*j*j+k*k*k)printf("%5d",num);}printf("\n");}6.#include<stdio.h>intreverse(intnumber);intmain(void){intx;printf("请输入一个正整数:\n");scanf("%d",&x);reverse(x);return0;}intreverse(intnumber){while(number!=0){printf("%d",number%10);number=number/10;}printf("\n");returnnumber;}第七章作业1.#include<stdio.h>voidmain(){inti,j=0,k=0,n,p,q,max,min;inta[10];printf("请输入n(1<n<10)的值:\n");scanf("%d",&n);printf("请输入%d\n",n);for(i=0;i<n;i++){scanf("%d",&a[i]);min=a[0];max=a[9];if(a[i]<min){min=a[i];k=i;}j=i;}

if(a[i]>max){max=a[i];}p=a[9];a[9]=a[j];a[j]=p;q=a[0];a[0]=a[k];a[k]=q;for(i=0;i<n;i++){printf("%8d",a[i]);printf("\n");}4.#include<stdio.h>intmain(void){intm,n,i,j,sum;inta[6][6],x[80];printf("请输入m,n(1<=m,n<=6)的值:\n");scanf("%d%d",&m,&n);printf("请输入%d个数:\n",m*n);for(i=0;i<m;i++)for(j=0;i<n;j++)scanf("%d",&a[i][j]);for(i=0;i<m;i++){for(j=0;j<n;j++)printf("%4d",a[i][j]);printf("\n");}for(i=0;i<m;i++){sum=0;for(j=0;j<n;j++)sum=sum+a[i][j];x[i]=sum;}for(i=0;i<m;i++)printf("%d\n",x[i]);return0;}5.#include<stdio.h>voidmain(){inta[3][3],max,max1,max2,i,j,flag=1;printf("请输入9个数:\n");for(i=0;i<=2;i++)for(j=0;j<=2;j++)scanf("%d",&a[i][j]);for(i=0;i<=2;i++){max=a[i][0];for(j=0;j<=2;j++){if(a[i][j]>max){max=a[i][j];max1=j;}}for(max2=0;max2<=2;max2++){if(max>a[max1][max2]){flag=0;break;}}if(flag==1)printf("鞍点是%d\n",a[max2][max1]);if(flag==0)printf("nonumber\n");flag=1;}}8.#include<stdio.h>#include<string.h>intmain(void){inti,n;chars[80];printf("请输入n(n<80)的值:\n");scanf("%d",&n);printf("请输入%dfor(i=0;i<n;i++)scanf("%s",s);for(i=0;s[i]!='\0';i++){if(s[i]>='A'&&s[i]<='Z')s[i]=155-s[i];}for(i=0;s[i]!='\0';i++)putchar(s[i]);printf("\n");return0;}#include<stdio.h>#include<string.h>intmain(void){inti,n; charf,s[80];printf("Enterastring:");/*输入字符串*/i=0;while((s[i]=getchar())!='\n')i++;s[i]='\0';n=0;for(i=0;s[i]!='\0';i++){if(s[i]<=7f&&s[i]>=20)s[i]=s[i++];elsebreak;}for(i=0;s[i]!='\0';i++)putchar(s[i]);return0;}第八章作业1.#include<stdio.h>intmain(void){charch;inta[10];inti,j,temp;printf("请输入10个整数:\n");for(i=0;i<10;i++)scanf("%d",&a[i]);printf("请输入A或D:");scanf("%c",&ch);if(ch=='A'){for(i=0;i<9;i++){for(j=i+1;j<10;j++){if(a[i]>a[j]){temp=a[i];a[i]=a[j];a[j]=temp;}}}for(i=0;i<10;i++){printf("%d\n",a[i]);}}elseif(ch=='D'){for(i=0;i<9;i++){for(j=i+1;j<10;j++){if(a[i]<a[j]){temp=a[i];a[i]=a[j];a[j]=temp;}}}for(i=0;i<10;i++){printf("%d\n",a[i]);}}return0;}5.#include<stdio.h>#include<string.h>voidmcopy(char*s,intm);intmain(void){inti,m,l;charstr[100];printf("请输入您要输入的字符串:");gets(str);printf("您将从原字符串的第mscanf("%d",&m);printf("复制后，新的字符串为:");mcopy(str,m);return0;}voidmcopy(char*s,intm){printf("%s\n",s+m-1);}11.#include<stdio.h>#include<string.h>voidfushu(char*p);intmain(void){charstr[80];printf("请输入一个英语名词单词:");scanf("%s",str);fushu(str);puts(str);return0;}voidfushu(char*p){inti,l;l=0;for(i=0;*(p+i)!='\0';i++){l++;}if(*(p+l-1)=='y'){*(p+l)='e';*(p+l+1)='s';*(p+l+2)='\0';}elseif((*(p+l-1)=='s')||(*(p+l-1)=='x')||((*(p+l-2)=='c')&&(*(p+l-1)=='h'))||((*(p+l-2)=='s')&&(*(p+l-1)=='h'))){*(p+l)='e';*(p+l+1)='s';*(p+l+2)='\0';}elseif(*(p+l-1)=='o'){*(p+l)='e';*(p+l+1)='s';*(p+l+2)='\0';}else{*(p+l)='s';*(p+l+1)='\0';}}12.#include<stdio.h>#include<stdlib.h>intmain(void){inti,j,a,n,sum,avg;int*p;printf("Entern:");scanf("%d",&n);if((p=(int*)calloc(n,sizeof(int)))==NULL){printf("Notabletoallocatememory.\n");exit(1);}printf("请输入%d个学生的成绩:\n",n);for(i=0;i<n;i++){scanf("%d",p+i);}sum=0;for(i=0;i<n;i++)sum=sum+*(p+i);avg=sum/n;for(i=0;i<n-1;i++){for(j=i+1;j<n;j++){if(*(p+i)>*(p+j)){a=*(p+i);}}

*(p+i)=*(p+j);*(p+j)=a;}printf("学生的平均成绩是:%d\n",avg);printf("学生的最高成绩是:%d\n",*(p+n-1));printf("学生的最低成绩是:%d\n",*p);return0;}第九章作业1.#include<stdio.h>struct{inthour,minute,second;}time;intmain(void){scanf("%d:%d:%d",time.hour,time.minute,time.second);time.second++;if(time.second==60){time.minute++;time.second=0;if(time.minute==60){time.hour++;time.minute=0;if(time.hour==24)time.hour=0;}}printf("%d:%d:%d",time.hour,time.minute,time.second);return0;}2.structs1{charc1,c2;intn;};structs2{intn;structs1m;};intmain(void){printf("\n\t%d\t%d\t%c\n",m.n,m.m,m.n,m.m.c1,m.m.c2);return0;}8.#include<stdio.h>#defineN10structperson{charnum[10];charname[20];doublejbgz,jj,zc,sfgz;};structpersongz[N];intmain(){inti,index;printf("请输入%d名工人的基本信息：\n",N);for(i=0;i<N;i++){printf("请输入第%d名工人的基本信息：\n",i+1);scanf("%s%s%lf%lf%lf",gz[i].num,gz[i].name,&gz[i].jbgz,&gz[i].jj,&gz[i].zc);}printf("%d名工人的基本信息：\n",N);printf("编号\t\t\t\t\tfor(i=0;i<N;i++)printf("%s\t%s\t%.2lf\t\t%.2lf\t%.2lf\t%.2lf\n",gz[i].num,gz[i].name,gz[i].jbgz,gz[i].jj,gz[i].zc,gz[i].sfgz=gz[i].jbgz+gz[i].jj-gz[i].zc);index=0;for(i=0;i<N