第8章結構體與共用體課后習題答案一、單選題1.D2.A3.D4.B5.B6.D7.C8.D9.C10.C二、程序填空題1.sizeof(bt)2.stud[i].name3.ptr=&stu;ptr->name4.ptr<stu+3ptr++5.n[i]=m[i];%s,%d\nn[i].no,n[i].data三、編程題1.#include<stdio.h>#include<stdlib.h>typedefstructstu{charnum[9];charname[15];ints1;ints2;ints3;structstu*next;}stu;stu*Buynode(){stu*node=(stu*)malloc(sizeof(stu));node->next=NULL;returnnode;}intmain(){intn=0;scanf("%d",&n);getchar();stu*cur,*head;cur=head=Buynode();scanf("%s",head->num);scanf("%s",head->name);scanf("%d%d%d",&head->s1,&head->s2,&head->s3);while(--n){getchar();stu*node=Buynode();scanf("%s",node->num);scanf("%s",node->name);scanf("%d%d%d",&node->s1,&node->s2,&node->s3);cur->next=node;cur=cur->next;}cur=head;intmax=cur->s1+cur->s2+cur->s3;while(cur){if((cur->s1+cur->s2+cur->s3)>max)max=cur->s1+cur->s2+cur->s3;cur=cur->next;}cur=head;while((cur->s1+cur->s2+cur->s3)!=max){cur=cur->next;}printf("%s%s%d",cur->name,cur->num,cur->s1+cur->s2+cur->s3);return0;}2.#include<stdio.h>intmain(){typedefstructo{charname[100];floatsalary1;floatsalary2;floatpay;}t;intn;scanf("%d",&n);tpeople[n];doublefee[n];for(inti=0;i<n;i++){scanf("%s%f%f%f",&people[i].name,&people[i].salary1,&people[i].salary2,&people[i].pay);fee[i]=people[i].salary1+people[i].salary2-people[i].pay;}for(inti=0;i<n;i++){printf("%s%.2lf\n",people[i].name,fee[i]);}return0;}3.#include<stdio.h>intcmp(chara[],charb[]){inti;for(i=0;i<8;i++){if(a[i]>b[i])return1;elseif(a[i]<b[i])return0;}}intmain(){intcmp(chara[],charb[]);intn,i,j;scanf("%d",&n);struct{charname[20];charold[9];chartel[50];}s[n],t;for(i=0;i<n;i++){scanf("%s%s%s",s[i].name,s[i].old,s[i].tel);}for(i=0;i<n-1;i++){for(j=0;j<n-1-i;j++){if(cmp(s[j].old,s[j+1].old)){t=s[j];s[j]=s[j+1];s[j+1]=t;}}}for(i=0;i<n;i++){printf("%s%s%s\n",s[i].name,s[i].old,s[i].tel);}}4.#include<stdio.h>typedefstructStudent{//結構體charnumber[6];//記住要設大一點,設5就不能通過charname[11];intgrade;}Student;intmain(){intn,i,j,sum=0;scanf("%d\n",&n);Studentstudent[n];for(i=0;i<n;i++){//輸入scanf("%s%s%d",student[i].number,student[i].name,&student[i].grade);sum+=student[i].grade;}doubleaverage=1.0*sum/n;printf("%.2f\n",average);for(i=0;i<n;i++){if(student[i].grade<average){printf("%s%s\n",student[i].name,student[i].number);}}return0;}5.#include<stdio.h>structbook{charname[32];doubleprice;}s[10],high,low;intmain(){intn;scanf("%d",&n);for(inti=0;i<n;i++){scanf("\n");gets(s[i].name);scanf("%lf",&s[i].price);}high=low=s[0];for(inti=1;i<n;i++){if(s[i].price>high.price)high=s[i];if(s[i].price<low.price)low=s[i];}printf("%.2lf,%s\n",high.price,);printf("%.2lf,%s\n",low.price,);return0;}6.#include<stdio.h>#include<string.h>intmain(){intn;scanf("%d",&n);intsex[n];chararr[n][15];inthx[51]={0};//標志匹配時是否已經匹配過的條件，0表非匹配，1表已被匹配，跳過for(inti=0;i<n;i++){scanf("%d%s",&sex[i],arr[i]);}for(inti=0;i<n/2;i++){for(intj=n-1;j>(n-1)/2;j--){if(sex[i]!=sex[j]&&hx[i]==0&&hx[j]==0){printf("%s%s\n",arr[i],arr[j]);hx[i]=hx[j]=1;}}}return0;}7.#include<stdio.h>intmain(){inth,m,s;scanf("%d:%d:%d:",&h,&m,&s);intn;scanf("%d",&n);//輸入的秒數inttime;//定義變量表示時間，以秒的形式存儲time=3600*h+60*m+s+n;//將相加后的時間表示成秒if(time>=86400)//一天86400秒，如果相加后秒數大于86400，則表明到了第二天{time=time-86400;//減去前一天的秒數，表示新一天的秒數}if(time<86400)//反之則沒有超過一天