main(){voidcpy(chars[],charc[]);charsty[80],c[80];printf(“nInputstring:”);gets(sty);cpy(sty,c);printf(“nThevowellettersare:%s”,c);}voidcpy(chars[],charc[]){inti,j;for(i=0,j=0;s[i]!=’ ’;i++)if(s[i]==’a’||s[i]==’A’||s[i]==’e’||s[i]==’E’||s[i]==’i’||s[i]==’I’||s[i]==’o’||s[i]==’O’||khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
s[i]==’u’||s[i]==’U’){c[j]=s[i];j++;}c[j]=’ ’;}5．参考答案：#include"stdio.h"#include”string.h”intalphabetic(charc){if((c>=’a’&&c<=’z’)||(c>=’A’&&c<=’Z’))khaw.comreturn(1);elsereturn(0);}intlongest(charstring[]){intlen=0,i,length=0,flag=1,place=0,point;for(i=0;i<=strlen(string);i++)if(alphabetic(string[i]))if(flag){point=i;flag=0;}else课后答案网{flag=1;if(len>=length){length=len;www.hackshp.cnplace=point;len=0;}}return(place);}main(){inti;charline[100];printf(“Inputoneline:n”);gets(line);printf(“nThelongestwordis:”)for(i=longest(line);alphabetic(line[i];i++)printf(“%c”,line[i]);printf(“n”);}khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
6．参考答案：将一个十进制整数m转换成r(2－16)进制字符串。方法：将m不断除r取余数，直到商为零，以反序得到结果。下面写出一转换函数，参数idec为十进制数，ibase为要转换成数的基（如二进制的基是2，八进制的基是8等），函数输出结果是字符串。char*trdec(intidec,intibase){charstrdr[20],t;inti,idr,p=0;while(idec!=0){idr=idec%ibase;if(idr>=10)khaw.comstrdr[p++]=idr-10+65;elsestrdr[p++]=idr+48;idec/=ibase;}for(i=0;i=’0’&&c<=’9’||c>=’a’&&c<=’f’||c>=’A’&&c<=’F’){flag=1;t[i++]=c;khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
}elseif(flag){t[i]=’ ’;printf(“decimalnumber%d:n”,htoi(t);printf(“Continueornot?”);c=getchar();if(c==’N’||c==’n’)flag1=0;else{flag=0;i=0;printf(“nInputahexnumber:”);khaw.com}}}}htoi(chars[]){inti,n;n=0;if(s[i]>=’0’&&s[i]<=’9’)n=n*16+s[i]-‘0’;for(i=0;s[i]!=’ ’;i++){if(s[i]>=’0’&&s[i]<=’9’)n=n*16+s[i]-‘0’;if(s[i]>=’A’&&s[i]<=’F’)n=n*16+s[i]-‘课后答案网A’+10;}return(n);}www.hackshp.cn7．参考答案：分析：输入year、month、day,先求出前month-1个月的总天数day_sum，再加上day即可。要注意闰年的二月问题main(){intday_sum=0,i,year,month,day;intday_tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};/*存储各月的天数（按平年处理）*/printf("nPleaseinputtoday"sdate(YEAR,MONTH,DAY):n");scanf("%d,%d,%d",&year,&month,&day);for(i=1;i2)/*闰年中的二月比平年多一天*/day_sum+=1;printf("nTodayisthe%dthdayof%d!n",day_sum,year);}8．参考答案：floatp(intn,intx){floatt,t1,t2;if(n==0)return(1);elseif(n==1)khaw.comreturn(x);else{t1=(2*n–1)*x*p((n–1),x);t2=(n–1)*p((n-2),x);t=(t1–t2)/n;return(t);}}9．参考答案：分析：该题的算法是先分别找出字符串的两头，然后同时逐一往中间移动，每移动一次都进行两字符的位置对换，直到中间字符（用s+i#include#include#defineN81www.hackshp.cnfun(char*s){inti=0,t,n=strlen(s);for(;s+imax)max=arr[i][j];khaw.comreturn(max);}11．参考答案：#defineM50main(){inta[M],c[5]={0},i,n,x;n=0;printf(“Enter1or2or3or4,toendwith-1n”);scanf(“%d”,&x);while(x!=-1){课后答案网if(x>=1&&x<=4){a[n]=x;n++;}scanf(“%d”,&x);}f(a,c,n);www.hackshp.cnprintf(“Outputtheresult:n”);for(i=1;i<=4;i++)printf(“%d:%dn”,i,c[i]);printf(“n”);}f(inta[],intc[],intn){inti;for(i=0;i#defineESC27structstudent_type{charname[10];／*姓名*／floatscore[3]；／*三门课成绩*／khaw.com}main(){structstudent_typestu；／*定义structstudent_type类型的结构体变量stu*／do{printf(”请输入学生的姓名、三门课学习成绩:n”)；scanf(”％s”，stu．name)；scanf(”％f％f％f”，&stu.score[0]，&stu.score[1]，&stu.score[2])；printf(“现输出该学生的数据如下：n”)；printf(“％10s％20sn”,”姓名”，”三门课成绩”)；printf(“％10s”，stu．name)；printf(“％8．2f，％课后答案网6．2f，％6．2f”，stu．score[0]，stu．score[l]，stu．score[2])；printf(”按Ese退出，按其他键继续．．．n”)；}while(getch()!＝ESC)；/*等待按键，按Ese退出，按其他键继续处理另一位学生的数据。*/}www.hackshp.cn2．参考答案：分析：(a+bi)*(c+di)=a*c-b*d+(b*c+a*d)i#includestructfushu{floata;floatb;}fushu1,fushu2,fushu3;main(){printf(“Inputshibuandxubu:n”);scanf(“%f%f”,&fushi1.a,&fushu1.b);printf(“Inputshibuandxubu:n”);scanf(“%f%f”,&fushi2.a,&fushu2.b);khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
printf(“%f+%fi”,fushu1.a,fushu1.b);printf(“%f+%fi”,fushu2.a,fushu2.b);fushu3.a=fushu1.a*fushu2.a-fushu1.b*fushu2.b;fushu3.b=-fushu1.a*fushu2.b+fushu1.b*fushu2.a;printf(“%f+%fi”,fushu3.a,fushu3.b);}3．参考答案：#includestructfushu{floata;floatb;khaw.com}fushu1,fushu2,fushu3;add(structfushufushu1,structfushufushu2){printf(“Inputshibuandxubu:n”);scanf(“%f%f”,&fushi1.a,&fushu1.b);printf(“Inputshibuandxubu:n”);scanf(“%f%f”,&fushi2.a,&fushu2.b);printf(“%f+%fi”,fushu1.a,fushu1.b);printf(“%f+%fi”,fushu2.a,fushu2.b);fushu3.a=fushu1.a+fushu2.a;fushu3.b=-fushu1.b+fushu2.b;printf(“%f+%fi”,fushu3.a,fushu3.b);}课后答案网subtract(structfushufushu1,structfushufushu2){printf(“Inputshibuandxubu:n”);scanf(“%f%f”,&fushi1.a,&fushu1.b);www.hackshp.cnprintf(“Inputshibuandxubu:n”);scanf(“%f%f”,&fushi2.a,&fushu2.b);printf(“%f+%fi”,fushu1.a,fushu1.b);printf(“%f+%fi”,fushu2.a,fushu2.b);fushu3.a=fushu1.a-fushu2.a;fushu3.b=-fushu1.b-fushu2.b;printf(“%f+%fi”,fushu3.a,fushu3.b);}main(){structfushufushu1,fushu2;add(fushu1,fushu2);sustract(fushu1,fushu2);}khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
4．参考答案：#include”stdio.h”structcharlink{charc;structcharlink*next;};intn;structcharlink*creat(){intlen;structcharlink*head,*p1,*p2;n=0;len=sizeof(structcharlink);khaw.comp1=p2=(structcharlink*)malloc(len);printf(“Inputthecharn”);scanf(“%c”,&p1.c);head=NULL;while(p1.c!=’0’){n++;if(n==1)head=p1;eslep2.next=p1;p2=p1;p1=(structcharlink)malloc(len);scanf(“%c”,&p1.c);}p2.next=NULL;课后答案网returnhead;}voidprint(structcharlink*head)www.hackshp.cn{structstudent*p;p=head;while(p!=NULL){printf(“char=%cn”,p.c);p=p.next;}}main(){structcharlink*head;head=create();print(head);khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
}5．参考答案：#defineN13structperson{intnumber;intnextp;}link[N+1];main(){inti,count,h;for(i=1;i<=N;i++)khaw.com{if(i==N)link[i].nextp=1;elselink[i].nextp=i+1;link[i].number=i;}printf(“n”);count=0;h=N;printf(“sequencethatpersonsleavethecircle:n”);while(coount2)sumday+=1;S=((year-1)+(year-1)/4.0-(year-1)/100.0+(year-1)/400.0+sumday);S%=7;printf("nsumday=%d,S=%d",sumday,S);khaw.comprintf("nTodayis%s",week[S]);}8．参考答案：方法一：使用二维数组#defineM5#defineN6main(){staticcharname[M][9]={“刘希民”,“梁天起”,“郑君丽”,“马军辉”,“张法”};voidaversum(floatscore[M][N]);voidsort(charname[M][9],floatscore[M][N]);staticfloatscore[][N]=课后答案网{{67.8,58.5,78,97.6,0,0},{89.4,100,88.7,89.4,0,0},{87.6,86.3,69.6,95.4,0,0},{78.6,83.8,56.7,78,0,0},{65.3,78.9,56.4,77.3,0,0}};aversum(score);sort(name,score);www.hackshp.cnprintf(“Thesortedgrade:n”);printf(“姓名C语言数据结构汇编语言计算机原理名次n”);printf(“=============================================”);for(i=0;iy?x:ymain(){intn1,n2;floatf1,f2;scanf("%d%d%f%f",&n1,&n2,&f1,&f2);printf("maxi=%dmaxf=%f",MAX(n1,n2),MAX(f1,f2));}经预编译宏替换后的printf语句如下：printf("maxi=%dmaxf=%f",n1>n2?n1:n2,f1>f2?f1:f2);3．参考答案：khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
#defineswap(x,y){intt;t=x;x=y;y=t;}main(){inti,a[10],b[10];for(i=0;i<10;i++)scanf(“%d”,&a[i]);for(i=0;i<10;i++)scanf(“%d”,&b[i]);for(i=0;i<10;i++)swap(a[i],b[i]);for(i=0;i<10;i++)printf(“%d”,a[i]);khaw.comprintf(“n”);for(i=0;i<10;i++)printf(“%d”,b[i]);}4．参考答案：#defineLEAP_YEAR(y)(y%4==0)&&(y%100!=0)||(i%400==0))#include”stdio.h”main()intyear;printf(“Inputyear:”);scanf(“%d”,&year)if(LEAP_YEAR(year))课后答案网printf(“%disaleapyear.n”,year);elseprintf(“%disnotaleapyear.n”);}www.hackshp.cn5．参考答案：1.用函数实现：main(){inta,b,c;printf(“Enterthreeintegers:”);scanf(“%d%d%d”,&a,&b,&c);printf(“max=%dn”,max(a,b,c));}max(intx,inty,intz){khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
intt;t=(x>y?x:y);return(t>z?t:z);}2用带参的宏实现#defineMAX(a,b)((a)>(b)?(a):(b))main(){inta,b,c;khaw.comprintf(“Pleaseenterthreeintegernumbers:”);scanf(“%d,%d,%dn”,&a,&b,&c);printf(“max=%dn”,MAX(MAX(a,b),c));}第10章文件1．参考答案：#include"stdio.h"#include"process.h"main(){FILE*fp;课后答案网charch,s[20];printf("Pleaseinputastring:n");if((fp=fopen("ss.txt","wb+"))==NULL){printf("Cannotopenthefile");www.hackshp.cnexit(0);}ch=getchar();while(ch!="#"){fputc(ch,fp);ch=getchar();}fclose(fp);if((fp=fopen("ss","r"))==NULL){printf("Cannotopenthefile");exit(0);}fscanf(fp,"%s",&s);puts(s);fclose(fp);khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
}2．参考答案：#include"stdio.h"#include"process.h"main(){charch;FILE*fp;if((fp=fopen("h:da.txt","r"))==NULL){printf("Cannotopenthefilen");exit(0);khaw.com}while(!feof(fp)){ch=fgetc(fp);if((ch>="a"&&ch<="z")||(ch>="A"&&ch<="Z")||(ch>="0"&&ch<="9"))putchar(ch);elsecontinue;}putchar("n");fclose(fp);}3．参考答案：课后答案网#includemain(){floatf[10]={3.2,-4.34,25.04,0.1,50.56,80.5,2.2,3.34.4,5.5};www.hackshp.cn/*定义浮点数组并初始化*/inti;FILE*fp;fp=fopen("test_b.dat","wb");/*创建一个二进制文件只写*/fwrite(f,sizeof(float),10,fp);/*将10个浮点数写入文件中*/fclose(fp);/*关闭文件*/}4．参考答案：#include"stdio.h"#include"process.h"main(){FILE*fp;charch,s[50];khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
if((fp=fopen("h:ss.txt","wb+"))==NULL){printf("Cannotopenthefile");exit(0);}printf("Pleaseinputastring:n");ch=getchar();while(ch!="#"){if(ch>="a"&&ch<="z")ch=ch-32;fputc(ch,fp);ch=getchar();}fclose(fp);khaw.comif((fp=fopen("h:ss.txt","r"))==NULL){printf("Cannotopenthefile");exit(0);}fscanf(fp,"%s",&s);puts(s);fclose(fp);}5．参考答案：#include"process.h"main(){课后答案网FILE*fp;charch,s[50];if((fp=fopen("h:ss.txt","wb+"))==NULL){printf("Cannotopenthefile");www.hackshp.cnexit(0);}printf("Pleaseinputastring:n");ch=getchar();while(ch!="#"){if(ch>="a"&&ch<="z")ch=ch-32;if(ch=="n")putchar(ch);fputc(ch,fp);ch=getchar();}fclose(fp);if((fp=fopen("h:ss.txt","r"))==NULL){printf("Cannotopenthefile");exit(0);}khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com
while(!feof(fp)){ch=fgetc(fp);putchar(ch);}fclose(fp);}6．参考答案：#includemain(){FILE*fp;khaw.comintdat[100];fp=fopen("test_b.dat","rb");/*打开一个二进制文件只读*/if(fread(dat,sizeof(int),100,fp)!=100)/*判断是否读了100个数*/{if(feof(fp))printf("Endoffile");/*不到100个数文件结束*/elseprintf("Readerror");/*读数错误*/fclose(fp);/*关闭文件*/}7．参考答案：课后答案网#include“stdio.h”main(intargc,char*argv[]){FILE*fp;charch;www.hackshp.cnif(argc!=2)/*参数个数不对*/{printf("thenumberofargumentsnotcorrectnn");printf(“Usage:可执行文件名filenamen”);exit(0);}if((fp=fopen(argv[1],"w"))==NULL)/*打开文件失败*/{printf("cannotopenthisfilen");exit(0);}for(;(ch=getchar())!="@";)fputc(ch,fp);/*输入字符并存储到文件中*/fclose(fp);}khdaw.com若侵犯了您的版权利益，敬请来信通知我们！℡www.khdaw.com'
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