大作业参考

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zhbaor 2021-01-06 00:35:47 +08:00
parent 5e8ae36141
commit 54ea4ecc70
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# - always expand for all pages automatically.
# - hide expand only when click on the sidebar toggle icon.
# - remove totally remove sidebar including sidebar toggle.
display: remove
display: post
# Sidebar padding in pixels.
padding: 18
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# If true, all words will placed on next lines if header width longer then sidebar width.
wrap: false
# If true, all level of TOC in a post will be displayed, rather than the activated part of it.
expand_all: false
expand_all: true
# Maximum heading depth of generated toc.
max_depth: 6

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<html>
<head><title>301 Moved Permanently</title></head>
<body>
<center><h1>301 Moved Permanently</h1></center>
<hr><center>nginx</center>
</body>
</html>

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---
title: 大作业参考函数
date: 2021-01-05 22:09:31
tags:
---
# 第一次大作业
## 数组逆置与左旋
```C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void Reverse(int* a, int n)
{
for (int i = 0; i < n / 2; ++i) {
int tmp = a[i];
a[i] = a[n - 1 - i];
a[n - 1 - i] = tmp;
}
}
void LeftRotate_1(int* a, int n, int m)
{
int* b = (int*)malloc(n * sizeof(int));
for (int i = 0; i < m; ++i) {
b[n - m + i] = a[i];
}
for (int i = m; i < n; ++i) {
b[i - m] = a[i];
}
memcpy(a, b, n * sizeof(int));
free(b);
}
void LeftRotate_2(int* a, int n, int m)
{
Reverse(a, m);
Reverse(a + m, n - m);
Reverse(a, n);
}
void LeftRotate_3(int* a, int n, int m)
{
int max;
int min;
if (m > n) {
max = m;
min = n;
} else {
max = n;
min = m;
}
int t = 1;
while (t != 0) {
t = max % min;
max = min;
min = t;
}
for (int i = 0; i < max; ++i) {
int k = i;
int oldValue = a[k];
for (int j = 0; j < n / max; ++j) {
k = (k + n - m) % n;
int newValue = a[k];
a[k] = oldValue;
oldValue = newValue;
}
}
}
int main()
{
int a[] = { 1, 2, 3, 4, 5 };
LeftRotate_3(a, 5, 2);
for (int i = 0; i < 5; ++i) {
printf("%d ", a[i]);
}
putchar('\n');
return 0;
}
```
## 筛法求素数
```C
#define N 100
void prime(void)
{
int a1, i, j;
int a[N] = { 0 };
char x;
int m = 0;
printf("请输入想要查找素数范围的上界(不大于%d):\n", N);
while (scanf("%d", &a1) != 1) {
while ((x = getchar()) != '\n')
putchar(x);
printf("是无效的命令,重新输入\n");
}
if ((a1 <= N) && (a1 >= 2)) {
for (i = 1; i < a1; i++)
a[i] = i + 1;
for (i = 1; i < a1; i++) {
if (a[i] != 0)
for (j = i + 1; j < a1; j++)
if ((a[j] % a[i]) == 0)
a[j] = 0;
}
printf("素数有:\n");
for (i = 0; i < a1; i++)
if (a[i] != 0) {
m++;
printf("%d%c", a[i], m % 5 ? ' ' : '\n');
}
}
if (a1 <= 1)
printf("该区间不存在素数\n");
if (a1 > N)
printf("上界溢出\n");
}
```
# 第二次大作业
## 插入
```C
//字符串连接
char a[N1][N2];
static int b[N1];
int* q = b;
char (*p)[N2] = a;
int length(int d) //计算字符串长度
{
int i = 0;
while (*(*(p + d) + i) != '\0')
i++;
return i;
}
void insert(int d, int e, int f) //字符串插入
{
//d,e是字符串序号,因为可能同时存储着多个字符串,存储使用了二维数组
//f作为作为插入位置,d为主字符串
int i;
for (i = (length(d) + length(e) + 1); i > (f + length(e) - 1); i--)
*(*(p + d) + i) = *(*(p + d) + i - length(e));
for (i = 0; i < length(e); i++)
*(*(p + d) + i + f) = *(*(p + e) + i);
}
```
## 子串与查找
```C
include <stdio.h>
void SubString(char* s, int pos, int n, char* sub)
{
int i;
for (i = 0; i < n; ++i) {
sub[i] = s[pos + i];
}
sub[i] = '\0';
}
int BeginsWith(char* a, char* b)
{
for (int i = 0;; ++i) {
if (a[i] == b[i]) {
if (a[i] == '\0') {
return 0;
}
continue;
}
if (b[i] == '\0') {
return 1;
}
return 0;
}
}
int Search(char* s, char* t)
{
for (int i = 0; s[i] != '\0'; ++i) {
printf("%s\n%s\n", s + i, t);
if (BeginsWith(s + i, t)) {
return i;
}
}
return -1;
}
```
## 替换
```C
#include <stdio.h>
#include <string.h>
#define MAX_LEN 100
void StrReplace(char *s, char *sub, char *new_sub)
{
// s: 输入的字符串
// sub: 需要替换的子串
// new_sub:替换的新子串
char *p = s, *q;
char *s_last = s + strlen(s); // s的结尾'\0'的位置
int sub_len = strlen(sub);
int new_sub_len = strlen(new_sub);
int diff = new_sub_len - sub_len;
// 省略了查找子串的实现,直接调用库函数strstr,找不到子串时返回NULL
while (p = strstr(p, sub))
{
// 把从p开始的sub字符串替换成new_sub
// 首先调整s中这个sub之后的字符的位置
if (diff > 0)
{
// 如果new_sub比sub长,需要把后面的字符(包括'\0')往后移
for (q = s_last; q >= p + sub_len; q--)
{
*(q + diff) = *q;
}
}
else if (diff < 0)
{
// 如果new_sub比sub短,需要把后面的字符(包括'\0')往前移
for (q = p + sub_len; q <= s_last; q++)
{
*(q + diff) = *q;
}
}
// 把new_sub复制过来
for (q = new_sub; *q != '\0'; q++, p++)
{
*p = *q;
}
// 更新s字符串的结尾位置
s_last += diff;
}
}
int main()
{
char s[MAX_LEN] = "deabcdeafdegdea";
StrReplace(s, "dea", "ii");
printf("%s\n", s);
return 0;
}
```
# 第三次大作业
## 打开文件创建链表
```C
#include <stdio.h>
#include <stdlib.h>
struct Student
{
char name[10];
float score;
struct Student *next;
};
struct Student *CreateFromFile(char *filename)
{
struct Student *temp, *head, *p;
FILE *fp;
// temp: 新建结点的地址
// head: 链表的头结点地址
// p: 链表最后一个结点的地址
head = (struct Student *)malloc(sizeof(struct Student));
p = head;
if (!(fp = fopen(filename, "r")))
{
printf("Failed to open file: %s\n", filename);
return head;
};
temp = (struct Student *)malloc(sizeof(struct Student));
// fscanf读到文件末尾时会返回EOF
while (fscanf(fp, "%s %f", temp->name, &temp->score) != EOF)
{
p->next = temp;
p = p->next;
temp = (struct Student *)malloc(sizeof(struct Student));
}
p->next = NULL;
free(temp);
return head;
}
void Print(struct Student *head)
{
struct Student *p = head->next;
while (p != NULL)
{
printf("%s %f\n", p->name, p->score);
p = p->next;
}
}
int main()
{
struct Student *head;
head = CreateFromFile("test.txt");
Print(head);
return 0;
}
```
## 在指定位置插入、有序插入
```C
#include <stdio.h>
#include <string.h>
typedef struct student {
int num;
char name[20];
float score;
struct student* next;
} stu;
stu* delete_pos(stu* head, int pos)
{
/*
删除指定位置记录
:param pos: 指定位置,从0开始
:return head: 返回链表头结点
*/
int i;
stu *t, *s = head;
//链表为空
if (head == NULL) {
printf("error: null linked list\n");
}
//删除头结点
if (pos == 0) {
head = head->next;
free(s);
return head;
}
//删除其他节点
for (i = 1; i < pos; i++) {
if (s->next == NULL) {
printf("error: pos out of range\n");
return head;
}
s = s->next;
}
if (s->next == NULL) {
printf("error: pos out of range\n");
return head;
}
t = s->next;
s->next = t->next;
free(t);
return head;
}
stu* insert_pos(stu* head, stu* s, int pos)
{
/*
指定位置插入
:param head: 头指针
:param pos: 指定位置,从0开始
:return head: 返回链表头结点
*/
stu* t = head;
int i;
if (i < 0) {
printf("error: pos out of range\n");
return head;
}
//头插
if (pos == 0) {
if (head == NULL) { //链表为空
head = s;
head->next = NULL;
return head;
} else { //非空
s->next = head;
head = s;
return head;
}
}
//其他位置
for (i = 1; i < pos; i++) {
if (t->next == NULL) {
printf("error: pos out of range\n");
return head;
}
t = t->next;
}
s->next = t->next;
t->next = s;
return head;
}
stu* insert_order(stu* head, stu* s)
{
/*
保持有序插入,只考虑正序
:param head: 头指针
:param s: 插入节点
:param pos: 指定位置,从0开始
:return head: 返回链表头结点
*/
stu* t = head;
int pos = 0;
//找到插入位置
while (s->num >= t->num) {
if (t->next == NULL) {
//链表达到结尾,尾插
pos++;
break;
} else {
t = t->next;
pos++;
}
}
return insert_pos(head, s, pos);
}
```
## 删除指定位置、重写学生文件
```C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define Student struct list
struct list {
char number[100];
char name[100];
float score;
Student* next;
}; //利用头结点建立链表,在链表最开头建立一个空白结点
void A_delete(Student* p1)
{ //删除p1结点的下一个结点
Student* p2 = p1->next;
p1->next = p2->next;
free(p2);
}
void A_print(Student* p)
{ //从p结点开始打印
int n = 1;
printf("\n##STUDENT MESSAGE:\n");
while (p != NULL) {
printf("No.%d\nSchool Number:%s\nName:%s\nScore:%-5.2f\n\n", n++, p->number, p->.name, p->.score);
p = p->next;
}
}
void Delete_pos(Student* head)
{
Student* p0;
int pos, i;
A_print((*head).pointer);
printf("**MENU/Delete/in certain position**\nPlease input the position(input 0 to break)\n");
scanf("%d", &pos);
while (pos) {
p0 = head;
for (i = 1; ((i < pos) && (p0->next != NULL)); i++)
p0 = p0->next;
A_delete(p0);
A_print(head->next);
printf("Please input a position(input 0 to break)\n");
scanf("%d", &pos);
}
}
void Record_write(Student* head, char* a)
{ //a用于不同的功能,当a为‘w’代表重写,当a为'a'代表追加
FILE* f;
char filename[100];
Student* p = head->next;
printf("**MENU/Record**\n");
printf("Please input the file name\n");
gets(filename);
f = fopen(filename, a);
while (p != NULL) {
fputs(p->number, f);
fprintf(f, "\n");
fputs(p->name, f);
fprintf(f, "\n");
fprintf(f, "%-5.2f\n", p->score);
p = p->next;
}
fclose(f);
printf("Write OK!\n");
}
```
## 追加学生文件、清空学生文件
```C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct student {
int id;
char name[20];
int score;
struct student *next;
};
void append_file(struct student *head, char *file_path) {
struct student *p;
FILE *fp;
if (head == NULL) {
return;
}
fp = fopen(file_path, "a");
if (fp == NULL) {
printf("open file %s failed", file_path);
return;
}
p = head; // head 是第一个节点
// p=head->next; // 如果 head 是专门的头节点,用这种写法
while (p != NULL) {
fprintf(fp, "%d %s %d\n", p->id, p->name, p->score);
p = p->next;
}
fclose(fp);
}
void clear_file(char *file_path) {
FILE *fp = fopen(file_path, "w");
if (fp == NULL) {
printf("open file %s failed", file_path);
return;
}
fclose(fp);
}
int main() {
struct student *head, *p;
char file_path1[] = "stu1.txt";
char file_path2[] = "stu2.txt";
head = malloc(sizeof(struct student));
head->id = 0;
strcpy(head->name, "stu0");
head->score = 90;
head->next = NULL;
p = malloc(sizeof(struct student));
p->id = 1;
strcpy(p->name, "stu1");
p->score = 89;
p->next = NULL;
head->next = p;
append_file(head, file_path1);
append_file(head, file_path1);
append_file(head, file_path2);
clear_file(file_path2);
return 0;
}
```

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@ -6,6 +6,10 @@ date: 2020-10-30 09:39:53
tags:
---
# 大作业参考函数
[点我](/~zhaozuohong/big-functions)
# 第八次作业
- [题目](/~zhaozuohong/homework8/)