C语言第十一章习题答案

11.1#include <iostream>struct date{int year;int month;int day;}date;void main(){static int day_table[]={31,28,31,30,31,30,31,31,30,31,30,31};int i,day_sum;printf("输入年，月，日\n\n");scanf("%d%d%d",&date.year,&date.month,&date.day);day_sum=0;for(i=0;i<date.month-1;i++)day_sum+=day_table[i];day_sum+=date.day;if((date.year%4==0)&&(date.year%100!=0)||(date.year%400==0)&&(date.m onth>2))day_sum+=1;printf("\n\n该日在本年中是第%d天\n\n",day_sum);}11.2#include <iostream>struct date{int year;int month;}date;void main(){int days(int y,int m,int d);printf("输入年，月，日\n\n");scanf("%d%d%d",&date.year,&date.month,&date.day);printf("\n\n该日在本年中是第%d天\n\n",days(date.year,date.month,date.day));}int days(int y,int m,int d){static int day_table[]={31,28,31,30,31,30,31,31,30,31,30,31}; int i,day_sum;day_sum=0;for(i=0;i<m-1;i++)day_sum+=day_table[i];day_sum+=date.day;if((y%4==0)&&(y%100!=0)||(y%400==0)&&(m>2))day_sum+=1;return day_sum;}11.3#include <iostream>#define N 2struct stu{int num;char name[10];float score[3];}stu[N];void main(){void print(struct stu *p);int i,j;struct stu *p;p=stu;for(i=0;i<N;i++){printf("\n\n输入第%d个学生的成绩\n\n",i+1);printf("输入学号：");scanf("%d",&((p+i)->num));printf("\n输入姓名：");scanf("%s",(p+i)->name);for(j=0;j<3;j++){printf("\n输入成绩%d：",j+1);scanf("%f",&((p+i)->score[j]));}}print(stu);}void print(struct stu *p){int i,j;printf("学号姓名成绩1 成绩2 成绩3\n\n"); for(i=0;i<N;i++){printf("%-8d%-8s",(p+i)->num,(p+i)->name);for(j=0;j<3;j++){printf("%-8f",(p+i)->score[j]);}printf("\n\n");}}11.4#include <iostream>#define N 2struct stu{int num;char name[10];float score[3];}stu[N];void main(){void input(struct stu *p);void print(struct stu *p);struct stu *p;p=stu;input(p);print(p);}void input(struct stu *p){int i,j;for(i=0;i<N;i++){printf("\n\n输入第%d个学生的成绩\n\n",i+1);printf("输入学号：");scanf("%d",&((p+i)->num));printf("\n输入姓名：");scanf("%s",(p+i)->name);for(j=0;j<3;j++){printf("\n输入成绩%d：",j+1);scanf("%f",&((p+i)->score[j]));}}}void print(struct stu *p){int i,j;printf("学号姓名成绩1 成绩2 成绩3\n\n"); for(i=0;i<N;i++){printf("%-7d%-7s",(p+i)->num,(p+i)->name);for(j=0;j<3;j++){printf("%-9.2f",(p+i)->score[j]);}printf("\n\n");}}11.5#include <iostream>#define N 3struct stu{char num[10];char name[10];float score[3];float average;}stu[N];void main(){void input(struct stu *p);void aver(struct stu *p);float aver_total(struct stu *p);void print(struct stu *p);struct stu *p;p=stu;input(p);aver(p);print(p);}void input(struct stu *p){int i,j;printf("按顺序依次输入学生的学号,姓名,成绩1,成绩2,成绩3\n\n"); for(i=0;i<N;i++){scanf("%s%s",(p+i)->num,(p+i)->name);for(j=0;j<3;j++)scanf("%f",&((p+i)->score[j]));}}void aver(struct stu *p){int i,j;float sum;for(i=0;i<N;i++){sum=0;for(j=0;j<3;j++){sum+=(p+i)->score[j];}(p+i)->average=sum/3;}}float aver_total(struct stu *p){float sum=0;for(;p<stu+N;p++)sum+=p->average;return (sum/N);}void print(struct stu *p){int i,j;struct stu *q;float max=0;printf("三门课的总平均成绩为：%f\n\n",aver_total(p));for(i=0;i<N;i++){if((p+i)->average>max){max=(p+i)->average;q=p+i;}}printf("最高分学生的数据为：\n\n");printf("学号姓名成绩1 成绩2 成绩3 平均成绩\n\n"); printf("%-7s%-7s",q->num,q->name);for(j=0;j<3;j++){printf("%-8.2f",q->score[j]);}printf("%-8.2f",q->average);printf("\n\n");}11.8#include <iostream>#include <malloc.h>#define NULL 0#define LEN sizeof(struct student)struct student{long int num;float score;struct student *next;}list_a,list_b;int n,sum;void main(){struct student *creat(void);struct student *insert(struct student *ha,struct student *hb); void print(struct student *head);struct student *ahead,*bhead,*abh;ahead=creat();sum=n;bhead=creat();sum=sum+n;abh=insert(ahead,bhead);print(abh);}struct student *creat(void){struct student *head;struct student *p1,*p2;n=0;p1=p2=(struct student *)malloc(LEN);printf("输入学生的学号和成绩\n\n");printf("如果输入的学号为0，就停止输入\n\n");scanf("%ld%f",&p1->num,&p1->score);head=NULL;while(p1->num!=0){n=n+1;if(n==1) head=p1;else p2->next=p1;p2=p1;p1=(struct student *)malloc(LEN);scanf("%ld%f",&p1->num,&p1->score);}p2->next=NULL;return(head);}struct student *insert(struct student *ha,struct student *hb) {struct student *pa1,*pa2,*pb1,*pb2;pa1=pa2=ha;pb1=pb2=hb;if(ha==NULL&&hb!=NULL) ha=hb;else{while((pb1->num>pa1->num)&&(pa1->next!=NULL)){pa2=pa1;pa1=pa1->next;if(pb1->num<=pa1->num){if(ha==pa1) ha=pb1;else pa2->next=pb1;pb2=pb1;pb1=pb1->next;pa2=pa1;pa1=pb2;pb2->next=pa2;}}if((pb1->num>pa1->num)&&(pa1->next==NULL)) pa1->next=pb1;}return (ha);}void print(struct student *head){struct student *p;printf("\n\n共有%d条记录，分别为：\n\n",sum); p=head;if(head!=NULL)do{printf("%ld%8.2f\n",p->num,p->score);p=p->next;}while(p!=NULL);}11.9#include <iostream>#include <malloc.h>#define N 13struct person{int num;int next;}link[N+1];void main(){int i,count,h;for(i=1;i<=N;i++){if(i==N) link[i].next=1;else link[i].next=i+1;link[i].num=i;}printf("\n\n");count=0;h=N;printf("退出者依次是：\n\n");while(count<N-1){i=0;while(i!=3){h=link[h].next;if(link[h].num) i++;}printf("%d ",link[h].num);link[h].num=0;count++;}printf("\n\n最后的成员是：");for(i=1;i<=N;i++){if(link[i].num) printf("%d\n\n",link[i].num); }}11.10#include <iostream>#include <malloc.h>#define LEN sizeof(struct student)#define NULL 0struct student{long int num;char name[20];struct student *next;}a,b;int n;void main(){struct student *creat(void);struct student *dele(struct student *ahead,struct student *bhead); void print(struct student *head);struct student *p1,*p2;printf("输入a中同学的学号，姓名\n\n");p1=creat();printf("输入b中同学的学号，姓名\n\n");p2=creat();print(dele(p1,p2));}struct student *creat(void){struct student *head;struct student *p1,*p2;n=0;p1=p2=(struct student *)malloc(LEN);scanf("%d%s",&p1->num,p1->name);head=NULL;while(p1->num!=0){n+=1;if(n==1) head=p1;else p2->next=p1;p2=p1;p1=(struct student *)malloc(LEN);scanf("%d%s",&p1->num,p1->name);}p2->next=NULL;return(head);}struct student *dele(struct student *ahead,struct student *bhead) {struct student *ah,*bh;struct student *ap1,*ap2,*bp1,*bp2;ap1=ap2=ahead;bp1=bp2=bhead;while(ap1->next){while(bp1->next){if(ap1->num!=bp1->num){bp2=bp1;bp1=bp1->next;}else{if(ap1==ahead) ahead=ap1->next;else ap2->next=ap1;ap2=ap1;ap1=ap1->next;break;}}}return(ahead);}void print(struct student *head){struct student *p;printf("删除后a中学生学号及成绩分别为：\n\n"); p=head;if(head!=NULL){do{printf("%ld%s",p->num,p->name);p=p->next;}while(p!=NULL);}}。