C语言程序设计何钦铭课后习题作业

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,Counterl,begin_答：合法的：_debug、Counterl、begin_。不合法的：Total、Large&Tall。2、改写节中的流程图，求1—100中能被6整除的所有整数的和。3、改写节中的程序，求1—100中能被6整除的所有整数的和，并在编程环境中验证该程序的运行结果。答：程序为：#include<>intmain(void)(inti,sum=0;for(i=1;i<=100;i++)if(i%6==0)sum=sum+i;printf("sum=%d\n",sum);return0;}4、对于给定的整数n(n>1)，请设计一个流程图判别n是否为一个素数(只能被1和自己整除的整数)，并分析该流程图中哪些是顺序结构、哪些是分支结构和循环结构。

开始入假>=(n输出n假,直直i=i+1输出nr=0开始入假>=(n输出n假,直直i=i+1输出nr=0结束i=2r=n/]的假>=(n输入输出n假输出nV直r=0直i=i+1假>=(n输入输出n假输出nV直r=0直i=i+1结束i=2r=n/i的第二章作业.编写程序，输入两个整数num和num2,计算并输出她们的和、差、积、商。答：程序：#include<>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*num2;y5=num1%num2;printf("num1,num2和y1=%d\nnum1,num2差y2=%d\nnum1,num2积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”，安装一户一表的居民用户电价分为两个“阶梯”：月用电量50千瓦时以内的，电价为元/千瓦时；超出50千瓦时的用电量，电价上调元/千瓦时。编写程序，输入用户的月用电量(千瓦时)，计算并输出该用户应支付的电费(元)。答：程序：#include<>voidmain()(doublex,y;printf(〃请输入月用电量：x\n〃)；scanf("%lf",&x);if(x<=50){y=*x;printf(〃电费y=%lf\n",y);}else(y=*x;printf(〃应支付电费y=%lf\n",y);}}.编写程序，输入实数*和正整数口，计算xn,,不允许调用pow()函数求幂。答：程序：#include<>voidmain()(doublex,power;inti,n;printf(〃请输入：x,n\n");scanf("%lf%d”,&x,&n);power=;for(i=1;i<=n;i++)power二power*x;printf("power(x,n)=%lf\n",power);}.编写程序，输入两个正整数山和必求Z(i2+1/i)(i从m到n。)答：程序：#include<>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+i);printf("sum=%lf\n",sum);}.编写程序，输入一个正整数n,计算1-2/3+3/5-4/7+5/9-6/11+…的前n项之和。答：程序：#include<>voidmain()(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二-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(loan)和月利率(rate)一定的情况下，住房贷款的月还款(money)取决于还款月数(皿0口计)。客户打算在5—30年的范围内选择还清贷款的年限，想得到一张“还款年限一月还款额表”以供参考。编写程序，输入贷款本金loan和月利率rate，输出“还款年限一月还款额表”，还款年限的范围是5—30年，输出时分别精确到年和元。Money=loan*rate(1+rate)month/[(1+rate)month-1]答：程序：#include<>#include<>voidmain()(intlower,upper,month,year,loan;doublemoney,rate;lower=5;upper=30;printf(〃请输入贷款本金：loan\n");scanf("%d”,&loan);printf(〃请输入月利率：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);}}.编写程序，输入一个正整数n,求E2i(i从1到n),可调用pow()函数求幂。答：程序：#include<>#include<>voidmain()(inti,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m求6=：£口(1从0到n)。要求定义和调用函数fact(n)计算n!，函数类型是double.答：程序：#include<>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二；for(i=1;i<=n;i++){product二product*i;}returnproduct;}第三章作业#include<>#include<>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)/;area二sqrt(s*(s-a)*(s-b)*(s-c));printf(〃三角形的周长perimeter=%.2lf\n三角形的面积area=%.2lf\n",perimeter,area);}}#include<>#include<>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;elserate=20;tax二rate*(salary-850)/100;printf(〃职工应缴个人所得税tax=%.2lf\n",tax);}#include<>voidmain()(doublem,n,y;printf(〃请输入行驶里程(公里)：m\n等待时间(分钟)：n\n〃);scanf("%lf%lf”,&m,&n);if((m+n/<=3)y=10;elseif((m+n/<=10)y=2*(m+n/;elsey=2*10+3*(m+n/;;printf(〃乘客应付车费y=%d\n”,(int)((y*10+/);}#include<>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(〃请输入第战d个学生成绩：\n〃，i);scanf("%lf”,&score);total二total+score;if(score>=90)A++;elseif(score>=80)B++;elseif(score>=70)C++;elseif(score>=60)D++;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);}#include<>voidmain()(intyear;printf(〃21世纪所有的闰年：\n〃)；for(year=2000;year<3000;year++)if(year%4==0&&year%100!二0||year%400==0)printf(〃％d\n〃,year);}第四章作业#include〃〃#include〃〃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))>={s=pow(x,i)*fact⑴+s;i++;}printf("s=%.2lf\n",s);}doublefact(intn)(inti;doubleresult;result=1;for(i=1;i<=n;i++)result二result*i;returnresult;}#include””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=%4\门〃,。0口田)；printf(〃各个位数之和为:％d\n”,sum);return0;}5、#include""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""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””#include””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(〃逐位输出：%d",n/m%10);printf(",");for(j=m/10;j>0;j=j/10)(n二k/j;printf('%d”,n%10);if(j!=1)printf(",");}}11、#include""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二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""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#include<>#include<>longfac(intn,inta)(longsum;if(n==1)sum=a;elsesum=(long)(pow(10,nT)*a)+fac(nT,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二fac(i,a);sum十二temp;}printf(〃它们的和是二为^^^口山)；return0;}#include<>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二number/10;if(a==dight)count++;}printf("%d\n”,count);returncount;}#include<>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;}#include<>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");}#include<>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二number/10;}printf("\n");returnnumber;}第七章作业1.#include<>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%4个数：\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二i;}if(a[i]>max){max=a[i];j=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");}#include<>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％4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;}#include<>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<>#include<>intmain(void)inti,n;chars[80];printf(〃请输入n(n<80)的值：\n");scanf("%d",&n);printf(〃请输入%4个字符：\n”,n);for(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<>#include<>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<>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二二,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(zz%d\nzz,a[i]);}}elseif(ch==，D，){for(i=0;i<9;i++){for(j=i+l;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<>#include<>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m位复制新字符串，请输入m:\n〃);scanf(〃%d〃,&m);printf(〃复制后，新的字符串为:〃)；mcopy(str,m);return0;}voidmcopy(char*s,intm)(printf("%s\n”,s+mT);}#include<>#include<>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;1=0；for(i=0;*(p+i)!=，\0，;i++){1++；}if(*(p+1-1)=-y，){(p+1)='e，;(p+1+1)='s';(p+1+2)=，\0，;}elseif((*(p+1-1)='s')||(*(p+lT)二二'x')||((*(p+1-2)==，c，)&&(*(p+1-1)二二'h'))||((*(p+1-2)==，s，)&&(*(p+1-1)==，h，))){(p+1)='e，;(p+1+1)='s';(p+1+2)=，\0，;}elseif(*(p+1-1)==，o?){(p+1)='e，;(p+1+1)='s';(p+1+2)=，\0，;else{*(p+l)=，s'*(p+l+1)='\0';}}#include<>#include<>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%4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二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#include<>struct(inthour,minute,second;}time;intmain(void)(scanf("%d:%d:%d",,,;++；if==60){++;=0;if==60){++;=0;if==24)=0;}}printf("%d:%d:%d",,,;return0;}structs1(charc1,c2;intn;)；structs2(intn;structsim;)；intmain(void)(printf("\n\t%d\t%d\t%c\n",,,,return0;}#include<>#defineN10structperson(charnum[10];charname[20];doublejbgz,jj,zc,sfgz;);structpersongz[N];intmain(){inti,index;printf(〃请输入%4名工人的基本信息：\n”,N);for(i=0;i<N;i++)(printf(〃请输入第%4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姓名\t基本工资\t奖金\t支出\t实发工资\n〃)；for(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);in