高级语言程序设计课程第九次个人作业
这个作业属于哪个课程：https://edu.cnblogs.com/campus/fzu/2024C
这个作业要求在哪里： https://edu.cnblogs.com/campus/fzu/2024C/homework/13311
学号：<102400227>
姓名：<谭培>
14.17.3:没问题
#include <stdio.h>
struct month{
char month[10];
char mon[3];
int days;
int math;
}months[12];
14.17.4：没问题
int main(){
struct month months[12]={
("January","Jan",31,1),
("Febtuary","Feb",28,2),
("March","Mar",31,3),
("April","Apr",30,4),
("May","May",31,5),
("June","Jun",30,6),
("July","Jul",31,7),
("August","Aug",31,8),
("September","Sep",30,9),
("Octorber","Oct",31,10),
("November","Nov",30,11),
("Decmber","Dec",31,12)
};
return 0;
}
14.17.5：一来char mon[]里打3导致数据丢失了，应该是3+1
#include <stdio.h>
struct month{
char month[10];
char mon[4];
int days;
int math;
};
struct month months[12]={
{"January","Jan",31,1},
{"Febtuary","Feb",28,2},
{"March","Mar",31,3},
{"April","Apr",30,4},
{"May","May",31,5},
{"June","Jun",30,6},
{"July","Jul",31,7},
{"August","Aug",31,8},
{"September","Sep",30,9},
{"Octorber","Oct",31,10},
{"November","Nov",30,11},
{"Decmber","Dec",31,12}
};
int cnt_days(int month){
int total=0;
for(int i=0; i<month; i++){
total+=months[i].days;
}
return total;
}
int main(){
int n=0;
if(scanf("%d",&n)==1&&n>0&&n<13){
int result=cnt_days(n);
printf("%d",result);
}
else return -1;
return 0;
}
14.17.10a
#include <stdlib.h>
#include <stdio.h>
struct gas{
float distance;
float gals;
float mpg;//mpg=distance/gals
};
int mpg(int distance,int gals){
int mpg=distance/gals;
return mpg;
}
int main(){
}
14.17.10.b
void get_mpg(struct gas *ptrip){
if(ptrip->gals>0){
ptrip->mpg=ptrip->distance/ptrip->gals;
}else{
ptrip->mpg=-1.0;
}
}
14.17.11：没问题
#include <stdio.h>
int main() {
enum choices{
no,yes,maybe
};
printf("no=%d, yes=%d, maybe=%d",no,yes,maybe);
return 0;
}
14.18.3:有点难，还查了strchr函数，运行也不顺利
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/*strchr 函数用于在一个字符串中查找指定字符第一次出现的位置，返回指向该字符的指针。
如果未找到，返回 NULL。其原型为char *strchr(const char *s, int c);。
例如：strchr("hello world", 'o')会返回指向字符串中第一个'o'的指针。*/
#define MAXTITL 40
/* 书名的最大长度 + 1 */
#define MAXAUTL 30
/* 作者姓名的最大长度 + 1 */
// 添加s_gets函数原型声明
char *s_gets(char *st, int n);
struct book {
/* 结构模版: 标记是book */
char title[MAXTITL];
char author[MAXAUTL];
float value;
};
// 比较函数，用于qsort按书名排序
int compare_titles(const void *a, const void *b) {
struct book *book_a = (struct book *)a;
struct book *book_b = (struct book *)b;
return strcmp(book_a->title, book_b->title);
}
// 比较函数，用于qsort按价格排序
int compare_values(const void *a, const void *b) {
struct book *book_a = (struct book *)a;
struct book *book_b = (struct book *)b;
if (book_a->value < book_b->value)
return -1;
else if (book_a->value > book_b->value)
return 1;
return 0;
}
void input_book(struct book *library) {
printf("Please enter the book title.\n");
s_gets(library->title, MAXTITL);
printf("Now enter the author.\n");
s_gets(library->author, MAXAUTL);
printf("Now enter the value.\n");
scanf("%f", &library->value);
}
void print_book(const struct book *library) {
printf("%s by %s: $%.2f\n", library->title,
library->author, library->value);
}
char *s_gets(char *st, int n) {
char *ret_val;
char *find;
ret_val = fgets(st, n, stdin);
if (ret_val) {
find = strchr(st, '\n');
// 查找换行符
if (find) {
// 如果地址不是NULL，
*find = '\0';
// 在此处放置一个空字符
} else {
while (getchar()!= '\n')
continue;
// 处理输入行中剩余的字符
}
}
return ret_val;
}
int main() {
int num_books;
printf("Enter the number of books: ");
scanf("%d", &num_books);
// 动态分配数组来存储图书信息
struct book *books = (struct book *)malloc(num_books * sizeof(struct book));
if (books == NULL) {
printf("Memory allocation failed!\n");
return 1;
}
// 输入图书信息
for (int i = 0; i < num_books; i++) {
printf("Enter information for book %d:\n", i + 1);
input_book(&books[i]);
}
// 按照输入图书顺序输出图书信息
printf("\nBooks in input order:\n");
for (int i = 0; i < num_books; i++) {
print_book(&books[i]);
}
// 按照书名字母顺序排序并输出图书信息
qsort(books, num_books, sizeof(struct book), compare_titles);
printf("\nBooks in alphabetical order by title:\n");
for (int i = 0; i < num_books; i++) {
print_book(&books[i]);
}
// 按照图书价格升序排序并输出图书信息
qsort(books, num_books, sizeof(struct book), compare_values);
printf("\nBooks in ascending order by value:\n");
for (int i = 0; i < num_books; i++) {
print_book(&books[i]);
}
// 释放动态分配的内存
free(books);
printf("Done.\n");
return 0;
}
14.18.4a
#include <stdio.h>
struct Name {
char first[50];
char middle[50];
char last[50];
};
struct Person {
char social_insurance_num[50];
struct Name name;
};
struct Person people[5] = {
{"123456789", {"John", "M", "Doe"}},
{"987654321", {"Jane", "", "Smith"}},
{"456789123", {"Bob", "A", "Johnson"}},
{"321456987", {"Alice", "L", "Brown"}},
{"789456123", {"David", "", "Lee"}}
};
void printPeople(struct Person *p, int size) {
for (int i = 0; i < size; i++) {
printf("%s, ", p[i].name.first);
if (p[i].name.middle[0]!= '\0') {
printf("%c. ", p[i].name.middle[0]);
}
printf("%s -- %s\n", p[i].name.last, p[i].social_insurance_num);
}
}
int main() {
printPeople(people, 5);
return 0;
}
14.18.4b
#include <stdio.h>
struct Name {
char first[50];
char middle[50];
char last[50];
};
struct Person {
char social_insurance_num[50];
struct Name name;
};
struct Person people[5] = {
{"123456789", {"John", "M", "Doe"}},
{"987654321", {"Jane", "", "Smith"}},
{"456789123", {"Bob", "A", "Johnson"}},
{"321456987", {"Alice", "L", "Brown"}},
{"789456123", {"David", "", "Lee"}}
};
void printPeople(struct Person p, int size) {
for (int i = 0; i < size; i++) {
printf("%s, ", p.name.first);
if (p.name.middle[0]!= '\0') {
printf("%c. ", p.name.middle[0]);
}
printf("%s -- %s\n", p.name.last, p.social_insurance_num);
}
}
int main() {
for (int i = 0; i < 5; i++) {
printPeople(people[i], 1);
}
return 0;
}
14.18.5：用Dev-C++确实费时间
#include <stdio.h>
#include <string.h>
#define CSIZE 4
typedef struct {
char first[11];
char last[11];
}full_name;
typedef struct {
full_name name;
double grade[3];
double average;
}student;
void set_grade(student list[]);
void set_average(student list[]);
void print(student list[]);
void set_all_average(student list[]);
int main() {
student list[CSIZE]={};
set_grade(list);
set_average(list);
print(list);
set_all_average(list);
return 0;
}
void set_grade(student list[]){
char c;
for(int i=0; i<CSIZE; i++){
printf("Please enter the students' name：\n");
if(scanf("%10s %10s",list[i].name.first,list[i].name.last)==2){
printf("Now,enter the 3 scode of this student:\n");
if(scanf("%lf%lf%lf",&list[i].grade[0],&list[i].grade[1],&list[i].grade[2])==3)
printf("Well,continue.\n");
}
}
}
void set_average(student list[]){
for(int i=0; i<CSIZE; i++){
double sum=0;
for(int j=0; j<3; j++){
sum+=list[i].grade[j];
}
list[i].average=sum/3;
}
}
void print(student list[]){
printf("%-10s %-10s%12s%20s\n","first name","last name","grades","average");
for(int i=0; i<CSIZE; i++){
printf("%-10s%-10s %.2f %.2f %.2f %10.2f\n",list[i].name.first,list[i].name.last,
list[i].grade[0],list[i].grade[1],list[i].grade[2],list[i].average);
}
}
void set_all_average(student list[]){
double sum=0;
for(int i=0; i<CSIZE; i++){
sum+=list[i].average;
}
double all_average=sum/4;
printf("\nall average is %.2f",all_average);
}
