C语言程序设计-基于计算思维的培养 习题答案 曾智勇

一、单项选择题

C语言程序设计习题解析与实验指导习题11B 2B 3A 4A 5、C 6、C 7、C 8D 9、B 10C二、填空题1、判断条件2、基本操作、控制结构3、当型循环、直到型循环4、复杂问题的分解和程序模块的划分5、编译、链接、运行、调试s/t->termsum+term->sumi+1->ii<=20?s/t->termsum+term->sumi+1->ii<=20?NY输出sums->temp,s+t->s,temp->t0.0->sum,2.0->s,1.0->t,0.0->term,0.0->temp,1->i开始结束1、其迭代方法如下：sum0.0，s2.0，t1.0，term0.0，temp0.0i1；②确定s/t->term；③确定迭代公式sum+term->sum；④通过temp更新迭代变量s，t；i20sum1是迭代法求和的流程图。图12、如图2所示。图23、如图3所示。输入整数个数输入整数个数ni<=n?NY输入整数aa%2==0?YN输出sumi+1->isum+a->sum结束1->i,0->sum开始图34、如图4所示。输入整数个数输入整数个数nn%3==0与n%5==0与n%7==0?Y输出n可同时被3,5,7整除N输出n不可同时被3,5,7整除开始结束图45、如图5所示。n素数判规是当n已知，果n能被2~ 间的意个数i整，则nnnninnnstep1n值；

n2~

之间的任意一个整数整除，nstep2环量值值k= ；nstep3除数i赋初值i=2；step4kstep5~step6step7；step5nistep7；step6i加1，i=i+1step4；step7n其流程图和N-S图如下：开始输入n开始输入nNi<=sqrt(n)YYn被i整除Ni=i+1YNi<n输出n不是素数输出n是素数结束i=2输入nK<sqrt(n)fori=2tokn被i整除Y N执行break结束循环i=i+1Y i<n N输出n不是素数输出n是素数66

5N-S图77

6N-S图year被4整除Y NY year被100整除 NLeap=0year被400整除Y NLeap=1Leap=1Leap=0Y leap N输出闰年输出非闰年图78、如图8所示。输入学生数n输入学生数n输入一个学生成绩scorei<=n?YN输出avsum+score->sum1->i,0.0->sum,0.0->av结束sum/n->av开始9、略。10、略。一、单项选择题

图8习题21->i,0->suma1、D 2、C 3、B 4、B 5、C 6、A 7、A 8、C 9C 10、1->i,0->suma12、C 13D 14、C 15B 16、D 17C 18、C 19、A 20、A 21、A22、D 23C 24、D 25、A二、填空题1、temptemp=aa=bb=cc=temp;25.53、14、0三、编程题1、小写字母与大写字母的转换关系为：小写字母=大写字母+32。代码如下：#include<stdio.h>intmain(){charch;ch=getchar();ch=ch+32;printf("%c\n",ch);return0;}2、代码如下：#include<stdio.h>#include<math.h>intmain(){longd=1000000,p=20000;doublem,r=0.00545;m=log10(p/(p-d*r))/log10(1+r);printf("%.1f",m);return0;}3、代码如下：#include<stdio.h>intmain(){intlength,width,height;printf("pleaseenterthelength,widthandheightofacuboid:");scanf("%d%d%d",&length,&width,&height);intarea=0,volume=0;area=length*width*4+width*height*2;volume=length*width*height;printf("%d\n%d\n",area,volume);return0;}4、代码如下：#nclde<tdio.>itai(){ina,b,c,tep;prnf(enera,b,c”)scaf(“d%d%d”,a,b,c);tep=a;a=bb=cc=tep;prnf(“%d,%d,%d”,a,b,c)return0;}5、代码如下：#include<stdio.h>intmain(){inta,b,c,d;scanf("%d",&d);a=d/100;b=d/10%10;c=d%10;printf("%d",c*100+b*10+a);return0;}本章实验题代码如下：#include<stdio.h>intmain(void){intd,i1,i2,i3,i4,i5,j1,j2,j3,j4,j5,first_sum,second_sum,total;printf("PleaseenterthefirstdigitofaUPC:");scanf("%1d",&d);printf("PleaseenterthefirstgroupoffivedigitsofaUPC:");scanf("%1d%1d%1d%1d%1d",&i1,&i2,&i3,&i4,&i5);printf("PleaseenterthesecondgroupoffivedigitsofaUPC:");scanf("%1d%1d%1d%1d%1d",&j1,&j2,&j3,&j4,&j5);first_sum=d+i2+i4+j1+j3+j5;second_sum=i1+i3+i5+j2+j4;total=3*first_sum+second_sum;printf("Checkdigit:%d\n",9-((total-1)%10));return0;}习题3一、单项选择题1、D 2、C 3、B 4、D 5、B二、阅读程序，填程运行结果124 28,14,5 3、x=2 4、aabb cc 5123,4 6、4294967295 7、13.7000008、a=%d,b=%d 9、a=98, b=765.000000, c=4321.000000本章实验题代码如下：#include<stdio.h>intmain(void){inti1,i2,i3,i4;charch;printf("PleaseEnterISBN:");scanf("%1d%c%3d%c%5d%c%1d",&i1,&ch,&i2,&ch,&i3,&ch,&i4);printf("Language:%1d\n",i1);printf("Publisher:%3d\n",i2);printf("BookNumber:%5d\n",i3);printf("Checkdigit:%d\n",i4);return0;}习题4一、单项选择题1、C 2B 3B 4A 5、A 6、D 7C 8、C 9B 10B 11B 12、D13、B 14C 15、A 16、D 17、B 18C 19、C 20B 21、C 22A 23、D24、B 25B 26、C 27、C 28、D 29、C 30、B二、填空题1、u，5 2、x<y，x<z，y<z三、阅读程序1、place=4，每位数字是：8，6，4，2四、编程题1、代码如下：#include<stdio.h>intmain(void){intgrade,level;scanf("%d",&grade);level=grade/10;printf("Yourscore:");switch(level){case9:printf("A\n");break;case8:printf("B\n");break;case7:printf("C\n");break;case6:printf("D\n");break;case5:case4:case3:case2:case1:case0:printf("E\n");default:printf("inputerror\n");}return0;}2、代码如下：#include<stdio.h>intmain(void){floatdata1,data2,data3;charch;scanf("%f%c%f",&data1,&ch,&data2);switch(ch){case'+':data3=data1+data2;break;case'-':data3=data1-data2;break;case'*':data3=data1*data2;break;case'/':data3=data1/data2;break;default:printf("error!\n");}printf("%f%c%f=%f\n",data1,ch,data2,data3);return0;}3、代码如下：#include<stdio.h>intmain(void){intyear;floatprintf("entermoneyandyear=?");scanf("%f%d",&money,&year);if(year==1)rate=0.00315;elseif(year==2)rate=0.00330;elseif(year==3)rate=0.00345;elseif(year==5)rate=0.00375;elseif(year==8)rate=0.00420;elserate=0.0;total=money+money*rate*12*year;printf("Total=%.2f\n",total);return0;}4、代码如下：#include<stdio.h>intmain(void){floatsalary,rate,tax,money;printf("entersalary:");scanf("%f",&salary);if(salary<1000)rate=0.0;elseif(salary>1000&&salary<=2000)rate=0.05;elseif(salary>2000&&salary<=3000)rate=0.1;elseif(salary>3000&&salary<=6000)rate=0.15;elserate=0.2;tax=salary*rate;money=salary-tax;return0;}5、代码如下：#include<stdio.h>intmain(void){intn;printf("enterainterger:");scanf("%d",&n);if(n%3==0&&n%5==0&&n%7==0)printf("%dcanbedividedexactlyby3,5,7 elseif(n%3==0&&n%5==0)printf("%dcanbedividedexactlyby3,5 elseif(n%5==0&&n%7==0)printf("%dcanbedividedexactlyby5,7 elseif(n%3==0&&n%7==0)printf("%dcanbedividedexactlyby3,7 elseif(n%3==0)printf("%dcanbedividedexactlyby3.");elseif(n%5==0)printf("%dcanbedividedexactlyby5.");elseif(n%7==0)printf("%dcanbedividedexactlyby7.");elseprintf("%dcannotbedividedexactlybyanyonenumberamong3,5,7.",n);return0;}6、代码如下：#include<stdio.h>#include<math.h>#defineEPS1e-1intmain(void){floata,b,c;intflag=1;printf("inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a+b>c&&b+c>a&&a+c>b){if(fabs(a-b)<=EPS&&(fabs(b-c)<=EPS&&fabs(c-a)<=EPS)){printf("等边");flag=0;}elei(as(b)=E|(ab(-c<=EP||(c-)=ES){printf("等腰");flag=0;}f(bsa*a+*b-*c)=ES|(as(*a+*c*)=ES|as(c+b*b-*a<=E)){printf("直角");flag=0;}if(flag)printf("一般");printf("三角形\n");}elseprintf("不是三角形");return0;}本章实验题1.身高预测#include<stdio.h>#include<stdlib.h>#include<conio.h>intmain(){floatfaHeight,moHeight,babyHeight;charsex,sport,diet;printf("pleaseinputyoursex:\n");printf("=======================输入 F 表示女性，M 表示男性=======================\n");scanf("%c",&sex);printf("性别是%c\n",sex);printf("pleaseinputfaHeightandmoHeight:\n");printf("==============================================\n");scanf("%f%f",&faHeight,&moHeight);printf("父亲身高是%f，母亲身高是%f\n",faHeight,moHeight);fflush(stdin);//刷新缓冲区printf("Doyoulikesport?\n");printf("======================= 喜 欢 输 入 Y ， 否 则 输 入N=======================\n");scanf("%c",&sport);printf("\n运动%c\n",sport);fflush(stdin);printf("Doyoueatahealthydiet?\n");printf("======================= 健 康 输 入 Y ， 否 则 输 入N=======================\n");scanf("%c",&diet);if(sex=='M'){if(sport=='Y'){if(diet=='Y'){饮食健康

}else{}

babyHeight=(faHeight+moHeight)*0.54*(1+0.02)*(1+0.015);//男性，运动，babyHeight=(faHeight+moHeight)*0.54*(1+0.02);//男性，运动，饮食不健康}else{

if(diet=='Y'){康}}else{

}else{}

babyHeight=(faHeight+moHeight)*0.54*(1+0.015);//男性，不运动，饮食健babyHeight=(faHeight+moHeight)*0.54;//男性，不运动，饮食不健康if(sport=='Y'){if(diet=='Y'){babyHeight=((faHeight*0.923+moHeight)/2)*(1+0.02)*(1+0.015);//女性，运动，饮食健康}else{babyHeight=((faHeight*0.923+moHeight)/2)*(1+0.02);//女性，运动，饮食不健康}}else{if(diet=='Y'){食健康}

}else{}

babyHeight=((faHeight*0.923+moHeight)/2)*(1+0.015);//女性，不运动，饮babyHeight=((faHeight*0.923+moHeight)/2);//女性，不运动，饮食不健康}printf("孩子的身高是：%f\n",babyHeight);system("pause");return0;}2.体重正常吗？#include<stdio.h>intmain(){doublea,b,g,BMI;while(scanf("%lf%lf",&a,&b)!=EOF){g=a/100;BMI=b/(g*g);if(BMI<19)printf("%.2lflower\n",BMI);elseif(BMI>=19&&BMI<25)printf("%.2lfhealth\n",BMI);elseif(BMI>=25&&BMI<30)printf("%.2lfheavy\n",BMI);elseif(BMI>=30&&BMI<40)printf("%.2lfsuperheavy\n",BMI);elseif(BMI>=40)printf("%.2lfextraheavy\n",BMI);}return0;}习题5一、单项选择题1、A 2、B 、D 4、B二、填空题1、intmain()，i=199;i>=17，i%17==0，i2、t=n%10，max=t3、x%i==0，break4、&n，n/10!=0，n=n/105、b=i/10%10，i==a*a*a+b*b*b+c*c*c6、i=0，f1>200三、编程题1代码如下：#include<stdio.h>#include<math.h>#defineEPS1e-1intmain(){floatx,y=0;intt;scanf("%f%d",&x,&t);if(t>7&&t<21){if(x<=3)y=0.1;else{y=0.1;do{y=0.1+y;x=x-1;}while(x-3>0);}}else{if(x<=3)y=0.1/2;else{y=0.1/2;do{y=0.1/2+y;x=x-1;}while(x-3>0);}}printf("telephone_fee=%.2f",y);return0;}2、代码如下：#include<stdio.h>intmain(){5);}

intx,y,z,count=1;printf("可能的兑换方法如下：\n");for(x=0;x<=100;x++)for(y=0;y<=50;y+=2)for(z=0;z<=20;z+=5)if(x+y+z==100)printf(count%4?"%d:1*%d+2*%d+5*%d\t":"%d:1*%d+2*%d+5*%d\n",count++,x,y/2,z/printf("\n\n兑换的方法数=%d",count-1);return0;3、代码如下：#include<stdio.h>intmain(){longn,sum,i;while(scanf("%ld",&n)!=EOF){printf1-%ld\n",n);sum=0;for(i=7;i<=n;i++)if(i%7==0)if(i%6==5)if(i%5==4)if(i%3==2){sum++;printf("%ld\n",i);}printf1-%ld%ld\n",n,sum);}}4、代码如下：intmain(){intx,y,z,number=0;printf(" Men Woman for(x=0;x<=10;x++){y=20-2*x;z=30-x-y;if(3*x+2*y+z==50)printf("%2d:%4d%5d%6d\n",++number,x,y,z);}}5、代码如下：#include<stdio.h>intmain(){chara,b,c;for(a='x';a<='z';a++)for(b='x';b<='z';b++){if(a!=b)for(c='x';c<='z';c++)if(a!=c&&b!=c){if(a!='x'&&c!='x'&&c!='z')printf("a→%c\nb→%c\nc→%c",a,b,c);}}}本章实验题1.龟兔赛跑#include<stdio.h>intmain(){intv1,v2,t,s,l;inti,tl=0,rl=0;charcount;scanf("%d%d%d%d%d",&v1,&v2,&t,&s,&l);intf=v1;for(i=1;;i++){if(rl-tl>=t&&v1>0){v1=0;count++;}if(count==s+1){count=0;v1=f;}if(count>0)count++;tl+=v2;rl+=v1;if(tl>=l&&rl>=l){printf("D\n%d\n",i);break;}elseif(tl>=l){printf("T\n%d\n",i);break;}elseif(rl>=l){printf("R\n%d\n",i);break;}}return0;}2、代码如下：#include<math.h>#include<stdio.h>#defineCONST1.42e8main(){intn;doubleterm=1,sum=1;for(n=2;n<=64;n++){term=term*2;sum=sum+term;}printf("sum=%e\n",sum);printf("volum=%e\n",sum/CONST);}3、代码如下：#include<stdio.h>#include<time.h>#include<stdlib.h>voidtask1();voidtask2();voidtask3();voidtask4();voidtask5();voidtask6();voidmenu();voidmain(){system("color2f");menu();}voidtask1(){intn,n2anser,esu; /* n,n2anwer*/srand(time(NULL));do{n1=rand()%10+1;n2=rand()%10+1;result=n1+n2;do{printf("%d+%d=n",n1,n2);scanf("%d",&answer);if(result!=answer){printf("Wrong,Pleasetryitagainn");}else{printf("Right!n");}}while(result!=answer);}while(1);}voidtask2(){intn1,n2,answer,result,counter=0; /*counter*/begin:srand(time(NULL));n1=rand()%10+1;n2=rand()%10+1;result=n1+n2;while(counter<=2){printf("%d+%d=?n",n1,n2);scanf("%d",&answer);if(result==answer){printf("Right!n");gotobegin;}else{printf("Wrrong!Pleasetryagain.n");counter++;}}printf("Wrong!Youhavetriedthreetimes!Testover!n");printf("请按1键返回主菜单!n");}voidtask3(){intn1,n2,answer,result,i=0,ri=0,wr=0/*ri,wrsrand(time(NULL));while(i<10){n1=rand()%10+1;n2=rand()%10+1;result=n1+n2;printf("%d+%d=n",n1,n2);scanf("%d",&answer);if(result==answer){printf("Rightn");++ri;}else{printf("Wrongn");++wr;}++i;}printf("恭喜！得分%dn",ri*10);printf("正确率%d%%n",ri%10*10);menu();return;}voidtask4(){intn1,n2,counter,score,t; /* scoretif*/floatanswer,result;chara;srand(time(NULL));counter=0;score=0;do{n1=rand()%10+1;n2=rand()%10+1;t=rand()%4;if(t==0){a='+';result=n1+n2;}if(t==1){a='-';result=n1-n2;}if(t==2){a='*';result=n1*n2;}if(t==3){a='/';result=n1/n2;}printf("%d%c%d=?",n1,a,n2);scanf("%f",&answer);counter++;if(answer!=result)printf("wrong!n");else{printf("Right!n");score++;}}while(counter<10);printf("总分为%d,正确率为%d%%",score*10,(score%10)*10);exit(0);}voidtask5(){intn1,n2;inti,counter,t;intresult,answer;charc;srand(time(NULL));for(counter=0;counter<8;counter++){printf("Try!n");for(i=1;i<11;i++){t=rand()%4;n1=rand()%10+1;n2=rand()%10+1;if(t==0){c='+';result=n1+n2;}if(t==1){c='-';result=n1-n2;}if(t==2){c='*';result=n1*n2;}if(t==3){c='/';result=n1/n2;}printf("%d%c%d=n",n1,c,n2);scanf("%d",&answer);if(result!=answer){printf("Wrongn");}else{printf("Right!n");counter=counter+1;}}}}voidtask6(){inti;intn1,n2,data;intresult;intanswer;intchoose1,choose2;floatj,rate;srand(time(NULL));do{ j=0;for(i=1;i<=10;i++){4

n1=rand()%10+1;n2=rand()%10+1;data=rand()%4;switch(data)/*data值产生之后，就需要计算结果与选择符号。因为符号一此随机数应该对4取余，从而得到data值为0到3*/{case0:printf("%d+%d=",n1,n2);result=n1+n2;break;case1:printf("%d-%d=",n1,n2);result=n1-n2;break;case2:printf("%d*%d=",n1,n2);result=n1*n2;break;case3:printf("%d/%d=",n1,n2);result=n1/n2;break;}scanf("%d",&answer);if(answer==result){choose1=rand()%4;switch(choose1)/*当计算正确时，choose1对4取余，随机得到0-3的数，然后选择一个回答正确时的夸奖语句*/{case0:printf("Verygood!n");break;case1:printf("Excellent!n");break;case2:printf("Nicework!n");break;case3:printf("Keepupthegoodwork!n");break;}j++;}else{的数，然后选择

choose2=rand()%4;switch(choose2)/*当计算错误时，choose2对4取余，随机得到0-3一个回答错误时鼓励的语句*/{case0:printf("No!Pleasetryagain!n");break;case1:printf("Wrong!Tryoncemore!n");break;case2:printf("Don'tgiveup!n");break;case3:printf("Notcorrect!Keeptrying!n");break;}}}rate=j/10;printf("精准度为:%fn",rate);}while(rate<=0.75);getchar();}voidmenu(){chara;intend;do{printf(" --小生算机学助统--n");printf(" -1.------task1-----------n");printf(" -2.------task2-----------n");printf(" -3.------task3-----------n");printf(" -4.------task4-----------n");printf(" -5.------task5-----------n");printf(" -6.------task6-----------n");printf(" printf(" n");scanf("%c",&a);switch(a){case'1':task1();break;case'2':task2();break;case'3':task3();break;case'4':task4();break;case'5':task5();break;case'6':task6();break;case'7':exit(0);break;default:break;}getchar();scanf("%d",&end);}while(end==1);}习题6一、单项选择题1、A 2、B 、C 4、A 5、D 6A 、C二、填空题1、i=1，i++，sum=sum+i，fun(100)2、n==2，f(n-1)3、intk，k<500，k%17==0，returnm，fun(500)4、f=n*f(n-1)，&n，y5、v=a*b*c，s2=b*c，h，&l，v=vs(l,w,h)，三、阅读程序，写出运行结果1、p=272、123453、24、3 7四、编程题1、代码如下：#include<stdio.h>doublegetSurface(doublelength,doublewidth,doubleheight);doublegetVolume(doublelength,doublewidth,doubleheight);intmain(){//定义长方体的长、宽、高doublelength,width,height,volume,area;printf("enterlength,widthandheightofacube:");scanf("%lf%lf%lf",&length,&width,&height);volume=getVolume(length,width,height);area=getSurface(length,width,height);printf("volume=%.2lf\narea=%.2lf\n",volume,area);return0;}//计算长方体表面积doublegetSurface(doublelength,doublewidth,doubleheight){return(length*width+width*height+length*height);}//计算长方体体积doublegetVolume(doublelength,doublewidth,doubleheight){returnlength*width*height;}2、代码如下：#include<stdio.h>unsignedlongFac(unsignedintn);intmain(){unsignedlongsum=0;unsignedinti;for(i=1;i<=10;i++)sum+=Fac(i);printf("sum=%ld",sum);return0;}unsignedlongFac(unsignedintn){unsignedlongresult=1;unsignedinti;for(i=1;i<=n;i++)result*=i;returnresult;}3、代码如下：#include<stdio.h>intdiv(intx);intmain(){inta,y;scanf("%d",&a);y=div(a);printf("%d",y);return0;}intdiv(intx){inty;if(x%5==0&&x%7==0)y=1;elsey=0;return(y);}4、代码如下：#include<stdio.h>intack(intm,intn){intx;if(m==0&&n==1)x=2;if(m==1&&n==0)x=2;if(m>0&&n>0)x=ack(m-1,ack(m,n-1));returnx;}voidmain(){intm,n;printf("Pleaseinput2intetgers:\n");scanf("%d%d",&m,&n);printf("ack(m,n)=%d\n",ack(m,n));}5、代码如下：#include<stdio.h>voidkblk(int);voidparse_sort(intnum,int*array);voidmax_min(int*array,int*max,int*min);intcount=0;intmain(){intn;printf("请输入一个四位数：");scanf("%d",&n);kblk(n);return0;}voidkblk(intnum){intarray[4],max,min;if(num!=6174&&num){parse_sort(num,array);max_min(array,&max,&min);num=max-min;printf("[%d]:%d-%d=%d\n",++count,max,min,num);kblk(num);}}voidparse_sort(intnum,int*array){inti,*j,*k,temp;for(i=0;i<4;i++){j=array+3-i;*j=num%10;num/=10;}for(i=0;i<3;i++)for(j=array,k=array+1;j<array+3-i;j++,k++)if(*j>*k){temp=*j;*j=*k;*k=temp;}return;}voidmax_min(int*array,int*max,int*min){int*i;*min=0;for(i=array;i<array+4;i++)*min=*min*10+*i;*max=0;for(i=array+3;i>=array;i--)*max=*max*10+*i;return;}6、代码如下：#include<stdio.h>intfish(intn,intx){if((x-1)%5==0){if(n==1)return1;elsereturnfish(n-1,(x-1)/5*4);}return0;}intmain(){inti=0,flag=0,x;do{i=i+1;x=i*5+1;if(fish(5,x)){flag=1;printf("五个人合伙捕到的鱼总数为:%d\n",x);}}while(!flag);}本章实验题1.小学生计算机辅助教学系统#include<stdio.h>#include<stdlib.h>#include<time.h>intCalulae(it,chro,inty;/alculte（x）op）*/intCeatRanomNmbe); /CreatRanomNmbe-10*/charCreateRandomOperator(); CreateRandomOperator(（*、/）*/voidPrintRandomRightEvaluation(PrintRandomRightEvaluation()，生成*/voidPrintRandomWrongEvaluation(PrintRandomWrongEvaluation()，生成*/intmain(){inta,b,userAnswer,i,rightNumber=0,flag=0;/*a,b,rightNumber751*/charopChar; /*opChar*/srand(time(NULL)); */do{for(i=0;i<10;i++) /*1010*/{a*/b*/

a=CreateRandomNumber(); /*b=CreateRandomNumber(); /*产一个机数给整型量opChar=CreateRandomOperator(); /*产生一随机算赋值给符变量opChar*/printf("%d%c%d=?\n",a,opChar,b); /*输一四运式=？*/scanf("%d",&userAnswer); /*用输答案*/if(userAnswer==Calculate(a,opChar,b))/*如果答案正确*/{PrintRandomRightEvaluation(); /*输一题做机示*/rightNumber++; /*回正题加1*/}else /**/{PrintRandomWrongEvaluation(); /**/}}printf("Totalscoreis%d\n",rightNumber*10);printf("Rateofcorrectnessis%d%%\n",rightNumber*10);if(rightNumber*10<75) /*75{printf("OnceAgain!\n");rightNumber=0; /**/flag=1;}}while(flag);return0;}/*（x,）（p*/intCalculate(intx,charop,inty){switch(op){case'+':returnx+y;case'-':returnx-y;case'*':returnx*y;case'/':returnx/y;default:printf("Operatorerror!\n");return0;}}/*1-10*/intCreateRandomNumber(){returnrand()%10+1;}/*函数功能：随机生成一个运算符号（+，-，*，/）*/charCreateRandomOperator(){intop;op=rand()%4+1;switch(op){case1:return'+';case2:return'-';case3:return'*';case4:return'/';}return0;}/*函数功能：生成一个题目做对的随机提示*/voidPrintRandomRightEvaluation(){inti;i=rand()%4+1;switch(i){case1:printf("Verygood!\n");break;case2:printf("Excellent!\n");break;case3:printf("Nicework!\n");break;case4:printf("Keepupthegoodwork!\n");break;default:printf("Wrongtype!");}}/*函数功能：生成一个题目做错的随机提示*/voidPrintRandomWrongEvaluation(){inti;i=rand()%4+1;switch(i){case1:printf("No.Pleasetryagain.\n");break;case2:printf("Wrong.Tryoncemore.\n");break;case3:printf("Don'tgiveup!\n");break;case4:printf("Notcorrect.Keeptrying.\n");break;default:printf("Wrongtype!");}}2、代码如下：#include<stdio.h>#defineMAX2147483647longre(longint);intnonres(longints);intmain(){longintn,m;intcount=0;printf("Pleaseenetranumberoptionaly:");scanf("%ld",&n);printf("Thegenerationprocessofpalindrome:\n");while(!nonres((m=re(n))+n)){if(m+n>=MAX){printf("inputerror,break.\n");break;}else{printf("[%d]:%ld+%ld=%ld\n",++count,n,m,m+n);n+=m;}}printf("[%d]:%ld+%ld=%ld\n",++count,n,m,m+n);printf("Herewereachedtheaimatlast!\n");return0;}longre(longinta){longintt;for(t=0;a>0;a/=10)t=t*10+a%10;returnt;}intnonres(longints){if(re(s)==s){return1;}else{return0;}}习题7一、单项选择题1、D 2、B 、A 4、C 5、C 6B二、填空题1、p<6，k=p2、&a[i]，i%10==03、&a[i]，&x，i--，x==a[i]4、&a[i]，SIZE-1，a[i]=a[j]，a[j]=t，j—5、c，s[j]，j++三、阅读程序，写出运行结果1、678552、sum=63、Thearrayhasbeenreverted.2,4,5,7,6,0,11,9,7,3四、编程题1、代码如下：#include<stdio.h>intcmp(inta[],intb[],charc){inti,j,aa1[10]={0},bb1[10]={0},aa2[10]={0},bb2[10]={0};charc1='a'+'b'-c;for(i=0;i<10;i++)for(j=0;j<10;j++)if(a[i]>b[j]){aa1[i]++;bb2[j]++;}elseif(a[i]<b[j]){aa2[i]++;bb1[j]++;}printf("%cbai：du\n",c);for(i=0;i<10;i++)printf("大于zhi%c数组：%d\t等于%c数组：%d\t小于%c数组：%d\n",c1,aa1[i],c1,10-aa1[i]-aa2[i],c1,aa2[i]);printf("%c数组：\n",c1);for(i=0;i<10;i++)printf("大于%c 数组：%d\t 等于%c 数组：%d\t 小于%c 数组：%d\n",c,bb1[i],c,10-bb1[i]-bb2[i],c,bb2[i]);for(i=j=0;i<10;i++)j+=aa1[i]-bb1[i];if(j==0)return 0;return }intmain(){inti,a[10],b[10],k;for(i=0;i<10;i++)scanf("%d",&a[i]);for(i=0;i<10;i++)scanf("%d",&b[i]);k=cmp(a,b,'a');if(k==0)printf("两个数组并列\n");elseif(k==1)printf("ab\n");elseprintf("b数比a数大\n");return 0;}2、代码如下：#include<stdio.h>voidinv(intx[],intn);intmain(){inti,a[10];for(i=0;i<10;i++)scanf("%d",&a[i]);inv(a,10);printf("Thearrayhasbeenreverted.\n");for(i=0;i<10;i++)printf("\n");return0;}voidinv(intx[],intn){intt,i,j,m=(n-1)/2;for(i=0;i<=m;i++){j=n-1-i;t=x[i];x[i]=x[j];x[j]=t;}}3、代码如下：#include<stdio.h>#include<math.h>#defineN300doubleaver(doublex[],intn){doubleaver=0.0,sum=0.0;inti;for(i=0;i<n;i++)sum=sum+x[i];aver=sum/n;returnaver;}doubleaversum(doublex[],intn){doubleave,sum=0.0;inti;ave=aver(x,N);for(i=0;i<n;i++)if(ave<x[i])sum=sum+x[i];returnsum;}intmain(){doublex[N],sum=0.0,ave=0.0;inti;for(i=0;i<N;i++)x[i]=10*tan(3.0+i*i);ave=aver(x,N);sum=aversum(x,N);printf("aver=%f\nm=%f\n",ave,sum);return0;}4、首先从数学上分析该问题：假设第一行中的素数为n[1]、n[2]、n[3]….n[i]、…第二行中的差值为m[1]、m[2]、m[3]…m[j]…。其中m[j]为：m[j]=n[j+1]-n[j]。N=(n[2]-n[1])+(n[3]-n[2])+(n[4]-n[3])+…+(n[j+1]-n[j])=n[j+1]-n[1]199318981898。2代码如下：#include"stdio.h"#include"stdlib.h"intmain(){inta[1994],i,j,num=0;//a0即可for(i=0;i<1994;i++)a[i]=0;for(i=3;i<=1993;i++){intkey=1;//key=1是表示是素数for(j=2;j<=i/2;j++)if(i%j==0){key=0;break;}if(key)a[i]=i;}for(i=3;i<1994;i++)//被减数一定大于1898+3{for(j=1898+3;j<1994;j++)if(a[j]-a[i]==1898){printf("%d%d\n",a[i],a[j]);num++;}}printf("\nd\n",num);system("pause");}5、代码如下：参考教材，略。6、代码如下：参考教材，略。本章实验题1.学生成绩管理系统V1.0略。习题8一、单项选择题1、C 2、B 、B 4、B 5、D二、填空题1、int*pa,pa=&a,*pa,&a,pa2、*pb,*pa,*pb,&c,&b三、阅读程序，写出运行结果1、10,20,302、first:a=3,b=2second:a=3,b=2third:a=2,b=33、10,20,70,104、82四、编程题1、代码如下：#include<stdio.h>voidSplitTime(longinttotal_sec,int*hr,int*min,int*sec);intmain(){longinttotal_sec;inthr,min,sec;printf("Entertotal_second:");scanf("%ld",&total_sec);SplitTime(total_sec,&hr,&min,&sec);printf("hr=%d,min=%d,sec=%d\n",hr,min,sec);system("pause");return0;}voidSplitTime(longinttotal_sec,int*hr,int*min,int*sec){inti,j;i=total_sec/60;j=total_sec-i*60;*sec=j;if(i<60){*min=i;*hr=0;}else{intk;*hr=i/60;k=i-*hr*60;*min=k;}}2、代码如下：#include<stdio.h>voidSwap(int*p1,int*p2);intmain(){intx,y;printf("inputtwointegernumbers:");scanf("%d%d",&x,&y);Swap(&x,&y);printf("%d\t%d\n",x,y);return0;}voidSwap(int*p1,int*p2){inttemp;temp=*p1;*p1=*p2;*p2=temp;}本章实验题1.学生成绩管理系统V2.0略。一、单项选择题

习题91、D 2、A 、D 4、C 5、D 6D 、C 8A 9、C二、阅读程序，写运结果1、XYZdefgh82、mo3、a=Iamateacher.a=Youareastudent.4、Iamateacher.三、编程题1、代码如下：#include<stdio.h>#include<string.h>intinsert(char*s1,char*s2,intp){char*cp,*tcp;tcp=s1+strlen(s1);cp=s1+p;if(tcp<cp)return-1;while(tcp>=cp){*(tcp+strlen(s2))=*tcp;tcp--;}while(*s2!='\0'){*cp=*s2;cp++;s2++;}return0;}intmain(void){charstr1[128];charstr2[128];intf;gets(str1);gets(str2);scanf("%d",&f);insert(str1,str2,f);puts(str1);return0;}2、代码如下：#include<stdio.h>#include<string.h>intstrcomp(char*s,char*t){while(*s!='\0'&&*t!='\0'){if(*s-*t>0)return1;if(*s-*t<0)return-1;s++;t++;}if(*s-*t>0)return1;if(*s-*t<0)return-1;return0;}intmain(void){charstr1[128];charstr2[128];intf;gets(str1);gets(str2);f=strcmp(str1,str2);printf("%d",f);return0;}3、代码如下：#include<stdio.h>#include<string.h>voiddel(char*str,char*sav,intk,intm);intmain(){intm,n;chars1[80],s2[80];gets(s1);scanf("%d%d",&m,&n);puts(s2);return0;}voiddel(char*str,char*sav,intk,intm){inti,j=0;//j要初始化for(i=0;i<strlen(str);i++){if(i==k-1){i+=m;//跳过m个字符}sav[j++]=str[i];}sav[j]='\0';//这里是sav不是str}4、代码如下：#include<stdio.h>#include<string.h>voidsort(char*str){inti,j,length=strlen(str);chartemp;for(i=0;i<length-1;i++) //if(*(str+i)>*(str+j)){}intmain(){

temp=*(str+i);*(str+i)=*(str+j);*(str+j)=temp;}charstr[256];gets(str);sort(str);puts(str);return0;}5、代码如下：#include<stdio.h>#include<string.h>intmain(){charstr[256];longn=0;inti,m;gets(str);while(strcmp("stop",str)!=0){m=strlen(str);for(i=0;i<m;i++){if(str[i]!=''&&str[i+1]=='')n++;if(str[i]!=''&&str[i+1]=='\0')n++;if(str[i]==''&&str[i+1]=='')continue;if(str[i]==''&&str[i+1]!='')continue;}gets(str);}printf("n=%ld\n",n);return0;}6、代码如下：#include<stdio.h>#include<string.h>intmain(){chars1[80],s2[40],*p1=s1,*p2=s2;printf("Input2string:\n");gets(s1);gets(s2);while(*p1!='\0') //s1while(*p2!='\0') //s2*p1++=*p2++;*p1='\0';while(p1!=s1) //{if(*p1!=32){p1--;continue;}else{p2=p1;while(p2!=s1) //{*p2=*(p2-1);p2--;}*p2='';p1--;}}puts(s1);return0;7、代码如下：#include<stdio.h>#include<string.h>inta[27];intmain(){inti=0;chars[80],*p=s;printf("Inputastring:\n");gets(s);while(*p!='\0'){if(*p>='A'&&*p<='Z'){*p=*p+32;}if(*p>='a'&&*p<='z'){a[*p-'a']++;}elsea[26]++;p++;}for(i=0;i<26;i++)printf("%c=%d",i+'a',a[i]);printf("other=%d\n",a[26]);return0;}本章实验题1V3.0略。一、单项选择题

习题101、D 2、D 、D 4、D 5、C 6B 、D 8D二、填空题1、r=r+b[k]、*x=r2、main()、char *pstr[3]、*(patr+j)3、p++、w[i-1]三、编程题1、代码如下：#include<stdio.h>#include<math.h>#defineN100doubleavernum(double*x,doublen,doubleave){doubleaver=0.0,a=0;inti;if(ave==0){for(i=0;i<n;i++)aver=aver+*(x+i);aver=aver/n;returnaver;}else{for(i=0;i<n;i++)if(ave<*(x+i))a++;returna;}}intmain(){doublex[N],m,aver;inti;for(i=0;i<N;i++)x[i]=200*cos(i*0.875);aver=avernum(x,N,0);m=avernum(x,N,aver);printf("aver=%f\nm=%f\n",aver,m);return0;}2、代码如下：#include<stdio.h>#include<math.h>#defineN300doubleavermax(double*x,doublen,doubleave){doubleaver=0.0,a=0;inti;if(ave==0){i=0;while(i<n){aver=aver+*(x+i);i++;}aver=aver/n;returnaver;}else{i=0;while(i<n){if(ave<*(x+i))a+=*(x+i);i++;}returna;}}intmain(){doublex[N],m,aver;inti;while(i<N){x[i]=10*cos(3.0+i*i)/5;i++;}aver=avermax(x,N,0);m=avermax(x,N,aver);printf("aver=%f\nm=%f\n",aver,m);return0;}3、代码如下：#include<stdio.h>#include<stdlib.h>#include<string.h>#defineN15inta[N][4];intb[N];char*name[]={" ","andwolf","andgoat","andcabbage"};intsearch(intStep){inti;/*若该种步骤能使各值均为1，则输出结果，进入回归步骤*/if(a[Step][0]+a[Step][1]+a[Step][2]+a[Step][3]==4){for(i=0;i<=Step;i++) /**/{printf("east:");if(a[i][0]==0)printf("wolf ");if(a[i][1]==0)printf("goat ");if(a[i][2]==0)printf("cabbage ");if(a[i][3]==0)printf("farmer ");if(a[i][0]&&a[i][1]&&a[i][2]&&a[i][3])printf("none");printf(" ");printf("west:");if(a[i][0]==1)printf("wolf ");if(a[i][1]==1)printf("goat ");if(a[i][2]==1)printf("cabbage ");if(a[i][3]==1)printf("farmer ");if(!(a[i][0]||a[i][1]||a[i][2]||a[i][3]))printf("none");printf("\n\n\n");if(i<Step)printf(" the%dtime\n",i+1);if(i>0&&i<Step){if(a[i][3]0) /**/{printf(" -----> farmer");printf("%s\n",name[b[i]+1]);}else /**/{printf(" <----- farmer");printf("%s\n",name[b[i]+1]);}}}printf("\n\n\n\n");return0;}for(i=0;i<Step;i++){if(memcmp(a[i],a[Step],160) */{return0;}}/**/if(a[Step][1]!=a[Step][3](a[Step][2]==a[Step][1]||a[Step][0]==a[Step][1])){return0;}/*递归，从带第一种动物开始依次向下循环，同时限定递归的界限*/for(i=-1;i<=2;i++){b[Step]=i;memcpy(a[Step+1],a[Step],16); /*制上步态进下步移*/a[Step+1][3]=1-a[Step+1][3]; /*农去或回*/if(i==-1){search(Step+1); /**/}elseif(a[Step][i]a[Step][3]) */{a[Step+1][i]=a[Step+1][3]; 带回物*/search(Step+1); /*行一*/}}return0;}intmain(){printf("\n\n ：\n\n\n");search(0);return0;}4、代码如下：#include<stdio.h>#include<math.h>