c语言第9章习题参考答案.doc

第9章习题一、选择题12345678910DDACBDCDDB1112131415CDBCA二 填空题1. 成员 指向2. stu 或 struct student311 20 114. printf(“%s”,p-name);5. pp15 struct pp *f();6. (*p).sex or p-sex7. 28. Mary9. r-next=q; p-next=r;10. 32三 程序分析题1. 212. 1999.4 zhang 1999.4 zhang y hang3. 5,34. 1,215. 13四、编程题1. 设计一个通讯录的结构体类型，并画出该结构体变量在内存的存储形式。typedef struct int no; char name15; char gender; char mobile20; char phone20; char address30; Contacts;Contacts con;2. 用结构体变量表示平面上的一个点（横坐标和纵坐标），输入两个点，求两点之间的距离。#include stdio.h#include math.htypedef struct float x; float y; Point;float distance(Point a, Point b) float dis; dis=sqrt(a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y); return dis;void main() Point a, b; printf(Please input the value of point a(Format: x,y):); scanf(%f,%f, &a.x, &a.y); printf(Please input the value of point b(Format: x,y):); scanf(%f,%f, &b.x, &b.y); printf(The distance between the two points is : %.3f n, distance(a,b);3. 用结构体变量表示日期（年、月、日），任意输入两个日期，求它们之间相差的天数。#include stdio.htypedef struct int year; int month; int day; Date;void main() int month12= 0,31,59,90,120,151,181,212,243,273,304,334, year; Date s, e; long sn, en; printf(Fromat: 2006-6-16-1989-01-25n); scanf(%ld-%ld-%ld-%ld-%ld-%ld, &s.year, &s.month, &s.day, &e.year, &e.month, &e.day); /* 计算起始日期距离公元元年的天数sn */ if( (s.year%4=0 & s.year%100!=0 | s.year%400=0 ) & s.month3 ) year=s.year/4 - s.year/100 + s.year/400 + s.year*365 - 1; else year=s.year/4 - s.year/100 + s.year/400 + s.year*365; sn = months.month - 1 + year + s.day; /* 计算终止日期距离公元元年的天数en */ if( (e.year%4=0 & e.year%100!=0 | e.year%400=0 ) & e.month3 ) year=e.year/4 - e.year/100 + e.year/400 + e.year*365 - 1; else year=e.year/4 - e.year/100 + e.year/400 + e.year*365; en = monthe.month - 1 + year + e.day; printf( There are %ld days between %ld-%ld-%ld and %ld-%ld-%ld.n , sn-en, s.year, s.month, s.day, e.year, e.month, e.day); 4. 用结构体变量表示复数（实部和虚部），输入两个复数，求两复数之积。#includetypedef struct int real; int image; Complex;void main() Complex c1, c2; int real, image; printf(Please input a complex (format: real image)n); scanf(%d%d, &c1.real, &c1.image); printf(Please input another complex (format: real image)n); scanf(%d%d, &c2.real, &c2.image); real=c1.real*c2.real-c1.image*c2.image; image=c1.real*c2.image+c2.real*c1.image; if(image0) printf(multipul result=%d+%din, real, image); else if(image0) printf(multipul result=%d%din, real, image); else printf(multipul result=%dn, real);5有20个学生，每个学生的数据包括学号（num）、姓名（name）、性别（sex）、五门课程成绩（score5）。要求编写一个程序，输入学生数据，计算并输出每个学生的总分和平均分。#include stdio.h#define STU_NUM 3typedef structchar no10;char name15;char sex;float score5; Student;void main()Student stuSTU_NUM;int i, j;float ave=0;/ inputfor(i=0; iSTU_NUM; i+)fflush(stdin);printf(Please input the no of %d student:, i+1);gets(stui.no);printf(Please input the name of %d student:, i+1);gets();printf(Please input the sex of %d student:, i+1);stui.sex=getchar();printf(Please input the five scores of %d student:, i+1);for(j=0; j5; j+)scanf(%f, &stui.scorej);printf(n);/ process and outputfor(i