1.略
2.略
3.略
4.代码如下：
#include <stdio.h> struct teacher { int card_id; char name[20]; char sex[10]; int birthYear; int birthMonth; union { // 1->未婚, 2->已婚, 3->离异 int stateNum; char state[10]; } married; char company[50]; }; int main() { struct teacher t1 = {123, "Sam", "男", 1990, 11, 2, "THU"}; printf("工资卡号：%d\n", t1.card_id); printf("姓名：%s\n", t1.name); printf("性别：%s\n", t1.sex); printf("出生年份：%d\n", t1.birthYear); printf("出生月份：%d\n", t1.birthMonth); printf("婚姻状态：%s\n", (t1.married.stateNum == 1 ? "未婚" : t1.married.stateNum == 2 ? "已婚" : "离异")); printf("工作部门：%s\n", t1.company); return 0; }5.代码如下：
#include <stdio.h> struct date { int year; int month; int day; }; int main() { struct date d1 = {2020, 11, 11}, d2 = {1990, 12, 5}; printf("年份差值：%d\n", d1.year-d2.year); printf("月份差值：%d\n", d1.month-d2.month); printf("日期差值：%d\n", d1.day-d2.day); return 0; }6.代码如下：
#include <stdio.h> struct student { int id; char name[20]; int grade; }; int main() { struct student s1 = {101, "Sam", 90}, s2 = {102, "Bob", 60}, s3 = {103, "Amy", 100}, s4 = {104, "Tim", 97}, s5 = {105, "Jessica", 95}; double average = (s1.grade + s2.grade + s3.grade + s4.grade + s5.grade) / 5.0; if (s1.grade > average) { printf("学生ID：%d，学生姓名：%s，学生成绩：%d\n", s1.id, s1.name, s1.grade); } if (s2.grade > average) { printf("学生ID：%d，学生姓名：%s，学生成绩：%d\n", s2.id, s2.name, s2.grade); } if (s3.grade > average) { printf("学生ID：%d，学生姓名：%s，学生成绩：%d\n", s3.id, s3.name, s3.grade); } if (s4.grade > average) { printf("学生ID：%d，学生姓名：%s，学生成绩：%d\n", s4.id, s4.name, s4.grade); } if (s5.grade > average) { printf("学生ID：%d，学生姓名：%s，学生成绩：%d\n", s5.id, s5.name, s5.grade); } return 0; }7.代码如下：
#include <stdio.h> #include <stdlib.h> struct student { int id; char name[20]; int math; int english; int program; }; int cmpFunc (const void *a, const void *b) { struct student *p1 = (struct student*)a, *p2 = (struct student*)b; return -((p1->math + p1->english + p1->program) - (p2->math + p2->english + p2->program)); } int main() { struct student s1 = {101, "Sam", 20, 30, 40}, s2 = {102, "Bob", 60, 60, 60}, s3 = {103, "Amy", 70, 70, 70}, s4 = {104, "Tim", 97, 98, 99}, s5 = {105, "Jessica", 95, 90, 98}, s6 = {106, "Robin", 60, 60, 34}, s7 = {107, "Rust", 100, 100, 100}, s8 = {108, "Python", 97, 99, 95}, s9 = {109, "Java", 95, 99, 80}, s10 = {110, "Swift", 95, 77, 66}; struct student list[] = {s1, s2, s3, s4, s5, s6, s7, s8, s9, s10}, temp; qsort(list, 10, sizeof(struct student), cmpFunc); for (int i = 0; i < 10; i++) { temp = list[i]; printf("学生%d的个人信息：\n学号：%d\t姓名：%s\t数学成绩：%d\t英语成绩：%d\t编程成绩：%d\n", i+1, temp.id, temp.name, temp.math, temp.english, temp.program); } return 0; }8.代码如下(用了随机数来模拟)：
#include <stdio.h> #include <stdlib.h> #include <time.h> struct player { int id; char name[30]; char nationality[30]; double avg_point; }; int cmpFunc (const void *a, const void *b) { struct player *p1 = (struct player*)a, *p2 = (struct player*)b; double temp = p1->avg_point - p2->avg_point; return temp > 0 ? -1 : temp == 0 ? 0 : 1; } int main() { srand(time(0)); double grades[10][7], avg_arr[10],temp, max, min; int i, j; for (i = 0; i < 10; i++) { for (j = 0; j < 7; j++) { grades[i][j] = (int)rand() % 11; } } for (i = 0; i < 10; i++) { temp = 0; max = grades[i][0]; min = max; for (j = 0; j < 7; j++) { temp += grades[i][j]; if (grades[i][j] > max) { max = grades[i][j]; } if (grades[i][j] < min) { min = grades[i][j]; } } temp -= max; temp -= min; avg_arr[i] = temp / 5; } struct player p1 = {101, "Sam", "中国", avg_arr[0]}, p2 = {102, "Bob", "美国", avg_arr[1]}, p3 = {103, "Amy", "英国", avg_arr[2]}, p4 = {104, "Tim", "法国", avg_arr[3]}, p5 = {105, "Jessica", "德国", avg_arr[4]}, p6 = {106, "Robin", "韩国", avg_arr[5]}, p7 = {107, "Rust", "日本", avg_arr[6]}, p8 = {108, "Python", "苏俄", avg_arr[7]}, p9 = {109, "Java", "古巴", avg_arr[8]}, p10 = {110, "Swift", "尤里", avg_arr[9]}; struct player list[] = {p1, p2, p3, p4, p5, p6, p7, p8, p9, p10}, temp_p; qsort(list, 10, sizeof(struct player), cmpFunc); for (i = 0; i < 10; i++) { temp_p = list[i]; printf("选手%d的个人信息：\n编号：%d\t姓名：%s\t国籍：%s\t总评：%lf\n", i+1, temp_p.id, temp_p.name, temp_p.nationality, temp_p.avg_point); } return 0; }9.代码如下(忽略键盘输入的过程)：
#include <stdio.h> #include <stdlib.h> struct student { int id; char name[20]; int grade; }; int *defineArray(int n) { return (int *)malloc(sizeof(int) * n); } void freeArray(int *p) { free(p); } int main() { int n = 5; struct student s1 = {101, "Sam", 90}, s2 = {102, "Bob", 60}, s3 = {103, "Amy", 100}, s4 = {104, "Tim", 97}, s5 = {105, "Jessica", 95}; struct student list[] = {s1, s2, s3, s4, s5}, temp; int *grades = defineArray(n), sum = 0; for (int i = 0; i < n; i++) { grades[i] = list[i].grade; } for (int i = 0; i < n; i++) { sum += grades[i]; } double avg = (double)sum / n; freeArray(grades); printf("平均成绩：%.2lf\n", avg); return 0; }10.代码如下：
#include <stdio.h> struct people { int id; char name[30]; struct people *next; }; int main() { struct people p1 = {1, "Sam"}, p2 = {2, "Bob"}, p3 = {3, "Amy"}, p4 = {4, "Tim"}, p5 = {5, "Jessica"}, p6 = {6, "Robin"}, p7 = {7, "Rust"}, p8 = {8, "Python"}, p9 = {9, "Java"}, p10 = {10, "Swift"}; p1.next = &p2; p2.next = &p3; p3.next = &p4; p4.next = &p5; p5.next = &p6; p6.next = &p7; p7.next = &p8; p8.next = &p9; p9.next = &p10; p10.next = &p1; struct people list[] = {p1, p2, p3, p4, p5, p6, p7, p8, p9, p10}, *temp_p = &p1, *prev_p = &p10; int n = 10, m = 3, i; m %= n; while (temp_p->next != NULL && temp_p->next->id != temp_p->id) { for (i = 1; i < m; i++) { prev_p = temp_p; temp_p = temp_p->next; } printf("报数：%d\n", temp_p->id); temp_p = temp_p->next; prev_p->next = temp_p; } printf("报数：%d\n", temp_p->id); return 0; }Chapter10 泛化编程与预编译
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