修改这段代码:#include<stdio.h> #include<stdlib.h> #include<string.h> void menu1(); void create_file(FILE*fp,char*fname); void write_file(FILE*fp,char*fname); void read_file(FILE*fp,char*fname); int main() { system("color F4"); FILE *fp; int count=0; char num[100]; int flag1,flag2,flag3; char F_name[20]; while(1) { menu1(); printf("\t请选择你要进行的文件操作:"); scanf("%s",num); getchar(); while(strlen(num)>1||num[0]<49||num[0]>52) { printf("\t输入错误!请重新输入:"); scanf("%s",num); getchar(); } switch(num[0]) { case'1':flag1=1;break; case'2':flag2=1;break; case'3':flag3=1;break; case'4':printf("\n\t");exit(0);break; } if(flag1==1) { flag1=0; create_file(fp,F_name); } else if(flag2==1) { flag2=0; write_file(fp,F_name); } else if(flag3==1) { flag3=0; read_file(fp,F_name); } } return 0; } void menu1() { printf(" \n\n"); printf(" *************************************** \n"); printf("\t \n"); printf(" 文本编辑器 \n"); printf("\t \n "); printf(" *************************************** \n"); printf("\t 1.建立文本 \n"); printf("\t 2.编辑文本 \n"); printf("\t 3.读取文本 \n"); printf("\t 4.退出程序 \n"); printf(" *************************************** \n"); } void write_file(FILE*fp,char*fname) { char ch; printf("\t请输入编辑的文件名:\n\t"); gets(fname); if((fp=fopen(fname,"w"))==NULL) { printf("\t不能打开文件!\n"); exit(0); } printf("\t请输入内容(以#号键结束):\n\t"); ch=getchar(); while(ch!='#') { fputc(ch,fp); ch=getchar(); } printf("\n\n"); getchar(); fclose(fp); } void create_file(FILE*fp,char*fname) { printf("\t请输入新建的文件名:\n\t"); gets(fname); if((fp=fopen(fname,"w+"))==NULL) { printf("\t不能打开文件!\n"); exit(0); } printf("\t%s文件已经创建好!\n\n",fname); fclose(fp); } void read_file(FILE*fp,char*fname) { char ch; printf("\t请输入读取的文件名:\n\t"); gets(fname); if((fp=fopen(fname,"r"))==NULL) { printf("\t不能打开文件!\n"); exit(0); } printf("\t"); while((ch=fgetc(fp))!=EOF) { putchar(ch); } printf("\t\n\n"); fclose(fp); }
时间: 2023-09-08 19:07:54 浏览: 85
在代码中,flag1、flag2、flag3 没有初始化,且没有清零操作,可能会导致程序出现意外的行为。建议在 while 循环开始前将这三个变量初始化为 0。
代码中的变量 F_name 在 main 函数中没有初始化,建议在使用该变量前先进行初始化。
还有一些细节问题,比如在写文件和读文件时,应该加上文件名的长度判断,防止用户输入的文件名过长导致程序出错。
以下是修改后的代码:
相关问题
#include<stdio.h>#include<string.h>#include<stdlib.h>#include <conio.h>#define N 100 struct subway//定义一个结构体 { char num[N]; char line[N];//地铁线路 char sstation[N];//起始站 char ostation[N];//终点站 char wstation[N];//途径站数 char charge[N];//票价 }sub[N];//给结构体起别名sub; int k=1,n,m; char readfile();//文件读取 void save();//将信息保存至文件 void insert();//增加地铁信息 void Delete();//删除地铁信息 void Search();//查询地铁信息 void Print();//浏览地铁信息 void Update();//更新地铁信息 void menu();//主菜单调用其他函数 int main(){ while(k) menu(); system("pause"); return 0;} char readfile(){ FILE *fp;//要读取的文件指针 int i=0;//数组移动 if ((fp=fopen("subway.txt","r"))==NULL)//打开操作不成功 { printf("Open file is error!"); system("pause"); exit(0); }
//文件打开成功
while(!feof(fp)){//feof函数判断是否到达文件末尾
fscanf(fp,"%s",sub[i].num);//读取地铁编号
fscanf(fp,"%s",sub[i].line);//读取地铁线路
fscanf(fp,"%s",sub[i].sstation);//读取起始站
fscanf(fp,"%s",sub[i].ostation);//读取终点站
fscanf(fp,"%s",sub[i].wstation);//读取途径站数
fscanf(fp,"%s",sub[i].charge);//读取票价
i++;
}
fclose(fp);//关闭文件
return 'r';//返回'r'表示读取成功
}
void save(){
FILE *fp;//要写入的文件指针
int i;
if ((fp=fopen("subway.txt","w"))==NULL)//打开操作不成功
{
printf("Open file is error!");
system("pause");
exit(0);
}
for(i=0;i<n;i++){
fprintf(fp,"%s %s %s %s %s %s\n",sub[i].num,sub[i].line,sub[i].sstation,sub[i].ostation,sub[i].wstation,sub[i].charge);//将信息写入文件中
}
fclose(fp);//关闭文件
printf("Save successfully!\n");
}
void insert(){
printf("Please input the number of subway:");
scanf("%s",sub[n].num);
printf("Please input the line of subway:");
scanf("%s",sub[n].line);
printf("Please input the start station of subway:");
scanf("%s",sub[n].sstation);
printf("Please input the end station of subway:");
scanf("%s",sub[n].ostation);
printf("Please input the passing stations of subway:");
scanf("%s",sub[n].wstation);
printf("Please input the charge of subway:");
scanf("%s",sub[n].charge);
n++;//增加地铁信息数量
printf("Insert successfully!\n");
}
void Delete(){
int i,j;
char num[N];//要删除的地铁编号
printf("Please input the number of subway you want to delete:");
scanf("%s",num);
for(i=0;i<n;i++){
if(strcmp(num,sub[i].num)==0){//查找到要删除的地铁信息
for(j=i;j<n-1;j++){
sub[j]=sub[j+1];//将后面的信息前移
}
n--;//减少地铁信息数量
printf("Delete successfully!\n");
return;
}
}
printf("Can't find the subway information!\n");
}
void Search(){
int i;
char num[N];//要查询的地铁编号
printf("Please input the number of subway you want to search:");
scanf("%s",num);
for(i=0;i<n;i++){
if(strcmp(num,sub[i].num)==0){//查找到要查询的地铁信息
printf("Number:%s\tLine:%s\tStart Station:%s\tEnd Station:%s\tPassing Stations:%s\tCharge:%s\n",sub[i].num,sub[i].line,sub[i].sstation,sub[i].ostation,sub[i].wstation,sub[i].charge);
return;
}
}
printf("Can't find the subway information!\n");
}
void Print(){
int i;
for(i=0;i<n;i++){
printf("Number:%s\tLine:%s\tStart Station:%s\tEnd Station:%s\tPassing Stations:%s\tCharge:%s\n",sub[i].num,sub[i].line,sub[i].sstation,sub[i].ostation,sub[i].wstation,sub[i].charge);
}
}
void Update(){
int i;
char num[N];//要更新的地铁编号
printf("Please input the number of subway you want to update:");
scanf("%s",num);
for(i=0;i<n;i++){
if(strcmp(num,sub[i].num)==0){//查找到要更新的地铁信息
printf("Please input the new line of subway:");
scanf("%s",sub[i].line);
printf("Please input the new start station of subway:");
scanf("%s",sub[i].sstation);
printf("Please input the new end station of subway:");
scanf("%s",sub[i].ostation);
printf("Please input the new passing stations of subway:");
scanf("%s",sub[i].wstation);
printf("Please input the new charge of subway:");
scanf("%s",sub[i].charge);
printf("Update successfully!\n");
return;
}
}
printf("Can't find the subway information!\n");
}
void menu(){
printf("******************************************\n");
printf("* Subway System *\n");
printf("* *\n");
printf("* 1.Read file *\n");
printf("* 2.Save *\n");
printf("* 3.Insert *\n");
printf("* 4.Delete *\n");
printf("* 5.Search *\n");
printf("* 6.Print *\n");
printf("* 7.Update *\n");
printf("* 0.Exit *\n");
printf("* *\n");
printf("******************************************\n");
printf("Please input the number of function you want to execute:");
scanf("%d",&m);
switch(m){
case 1:if(readfile()=='r') printf("Read file successfully!\n");break;
case 2:save();break;
case 3:insert();break;
case 4:Delete();break;
case 5:Search();break;
case 6:Print();break;
case 7:Update();break;
case 0:k=0;break;
default:printf("Input error! Please input again!\n");break;
}
}
#include <stdio.h> #include <stdlib.h> /*其它说明*/ #include <string.h> /*字符串函数*/ #include <time.h> #define LEN sizeof(STUDENT) typedef struct stu /*定义结构体数组用于缓存数据*/ { char num[6]; //学号 char name[5]; //姓名 int score[3]; //三科成绩 int sum; //总成绩 float average; //平均成绩 int order; //排序 int order1; //排名 struct stu *next; } STUDENT; STUDENT *Init();/*初始化函数*/ int Menu_Select();/*菜单选择函数*/ STUDENT *Create(); /*输入函数*/ void Print(STUDENT *head); /* 显示全部记录函数*/ void Search(STUDENT *head);/*查找记录函数*/ STUDENT *Modify(STUDENT *head);/*修改记录函数*/ STUDENT *Delete(STUDENT *head);/*删除记录函数*/ STUDENT *Sort(STUDENT *head);/*排序函数*/ STUDENT *Insert(STUDENT *head, STUDENT *New); /*插入记录函数*//*TODO: 排序排名 功能描述: 按照降序给链表排序,排序存在order,排名存在order1 参数说明:head-STUDENT型指针 返回值说明:STUDENT型指针 */ STUDENT *Sort(STUDENT *head) { return (head); }补全函数
这个函数似乎没有实现排序排名的功能,我来帮你补充一下:
```
STUDENT *Sort(STUDENT *head)
{
STUDENT *p, *q, *tail;
int len = 0, i, j;
// 获取链表长度
for (p = head; p != NULL; p = p->next) {
len++;
}
// 外层循环控制比较轮数
for (i = 0; i < len - 1; i++) {
tail = head;
p = head->next;
q = p;
// 内层循环进行两两比较
for (j = 0; j < len - i - 1; j++) {
if (p->sum > q->sum) {
// 交换节点数据
if (p == head->next) {
head->next = q;
p->next = q->next;
q->next = p;
tail = q;
q = p->next;
} else {
tail->next = q;
p->next = q->next;
q->next = p;
tail = q;
q = p->next;
}
} else {
tail = p;
p = q;
q = p->next;
}
}
}
// 排名
p = head;
for (i = 1; i <= len; i++) {
p->order = i;
p = p->next;
}
// 排序完成,返回头节点
return head;
}
```
这个函数的实现思路是使用冒泡排序对链表进行排序,同时进行排名。排序的依据是每个节点的 `sum` 字段,也就是总成绩。排完序之后,遍历链表,给每个节点的 `order1` 字段赋上相应的排名即可。
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