stdstring源码

1. C++，大佬们看下这里报错是为什么可是这代码能AC啊！

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2. c++课程设计源代码

c++课程设计 学生管理系统源代码
#include<iostream>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
using namespace std;
typedef struct stu
{
char name[20];
long int number;
int snum;
char sex[20];
char add[30] ;
char time[20];
char tel[20];
struct stu *next;
}stu,*student;
int init(student &s);
void insert(student &s);
void print(student &s);
int delete(student &s);
void find (student &s);
void findname(student &s);
void findnum(student &s);
void modifay(student &s);
void putfile(student &s);
void getfile(student &s);

void main()
{
student s;
init(s);
cout<<"欢迎使用学生管理系统."<<endl;
cout<<" "<<endl;
cout<<endl;
while(1)
{
int i;
mainint:
cout<<"请选择相关操作:"<<endl<<"1.建立学生资料文件."<<endl<<"2.浏览."<<endl<<"3.删除."<<endl;
cout<<"4.查询."<<endl<<"5.修改."<<endl<<"6.打开学生文件."<<endl<<"7.退出管理系统." <<endl<<"请选择:";
cin>>i;
if(i<0||i>7)
{
cout<<"输入了错误的数字,Again!"<<endl<<endl;
goto mainint;
}
switch(i)
{
case 1: insert(s);break;
case 2: print(s);
putfile(s);
break;
case 3: ldelete(s);break;
case 4: find(s);break;
case 5: modifay(s);
break;
case 6: getfile(s);break;
case 7: exit(0);
}
}

}
int init(student &s)
{
s=(student)malloc(sizeof(stu));
if (s)
{
s->next=NULL;
return 0;
}
else return -1;
}
void insert(student &s) //insert
{
cout<<endl;
student p,q;
p=(student)malloc(sizeof(stu));
cout<<"请输入学生信息："<<endl;
cout<<"姓名:";
cin>>p->name;
cout<<endl;
cout<<"学号:";
cin>>p->number;
cout<<endl;
cout<<"性别:";
cin>>p->sex;
cout<<endl;
cout<<"家庭住址:" ;
cin>>p->add;
cout<<endl;
cout<<"出生年月:" ;
cin>>p->time;
cout<<endl;
cout<<"宿舍号:";
cin>>p->snum;
cout<<endl;
cout<<"宿舍号码:";
cin>>p->tel;
q=s;
while(!(q->next==NULL)&&(q->next->number<p->number))
q=q->next;
p->next=q->next;
q->next=p;
//if()p->next=NULL;
//free(p);

}
int ldelete(student &s) //delete
{
cout<<endl;
student p,a;
p=s ;
cout<<"请输入删除的学号:";
long int number;
cin>>number;
while(p)
{ if (p->number==number)
{
a->next=p->next;
free(p); return(0);}
else
{ a=p;
p=p->next;} }
cout<<"没有找到你要删除的选项!"<<endl<<endl;return(-1);
}
void print(student &s)
{
int a;
a=0;
student p;
p=s->next;
cout<<"姓名 "<<"学号 " <<"性别 "<<"家庭住址 "<<"出生年月 "<<"宿舍号"<<"宿舍号码"<<endl;
while(p)
{
a++;
cout<<p->name<<" "<<p->number<<" "<<p->sex<<" "<<p->add<<" "<<p->time<<" "<<p->snum<<" "<<p->tel<<" "<<endl;
p=p->next;
}
cout<<endl;
if (a==0)
cout<<"还没有学生信息!"<<endl<<endl ;
}
void find (student &s) //find
{
findl:
cout<<"请选择查找方法:"<<endl<<"1.按姓名查找."<<endl<<"2.按学号查找."<<endl;
cout<<"请选择:";
int k;
cin>>k;
if(k<0||k>3)
{
cout<<"输了入错误数字,Again!"<<endl<<endl;
goto findl;
}

switch(k)
{
case 1: findname(s);break;
case 2: findnum(s);break;
}
}

void findname(student &s) //find by name
{
student p;
p=s->next;
cout<<"请输入姓名：";
char name[20];
int j;
j=0;
cin>>name;
cout<<"你要查找的资料是:"<<endl;
cout<<"姓名 "<<"学号 " <<"性别 "<<"家庭住址 "<<"出生日期 "<<"宿舍号 "<<"宿舍号码"<<endl;
while(p)
{
if (strcmp(p->name,name)==0)
{
cout<<p->name<<" "<<p->number<<" "<<p->sex<<" "<<p->add<<" "<<p->time<<" "<<p->snum<<" "<<p->tel<<" "<<endl;
j++;
}
p=p->next;
}
cout<<endl;
if(j==0)
cout<<"对不起,没找到你要的信息!"<<endl<<endl ;
}
void findnum(student &s) //find by number
{
student p;
p=s->next;
cout<<"请输入学号：";
long int number;
int j;
j=0;
cin>>number;
cout<<"你要查找的资料是:"<<endl;
cout<<"姓名 "<<"学号 "<<"性别 "<<"家庭住址 "<<"出生日期 "<<"宿舍号 "<<"宿舍电话"<<endl;
while(p)
{
if (p->number==number)
{
cout<<p->name<<" "<<p->number<<" "<<p->sex<<" "<<p->add<<" "<<p->time<<" "<<p->snum<<" "<<p->tel<<" "<<endl;
j++;
}
p=p->next;
}
cout<<endl;
if(j==0)
cout<<"对不起,没找到你要的信息"<<endl<<endl ;
}
void modifay(student &s) //modifay
{
student q,p,l,m;
int j;
j=0;
q=s->next;
l=s;
m=s;
cout<<"请输入要修改的学号:" ;
long int num;
cin>>num;
cout<<"姓名 "<<"学号 "<<"性别 "<<"家庭住址 "<<"入学时间 "<<"宿舍号 "<<"电话号码"<<endl;
while(q)
{
if (q->number==num)
{
cout<<"你要修改的信息是:"<<endl;
cout<<q->name<<" "<<q->number<<" "<<q->sex<<" "<<q->add<<" "<<q->time<<" "<<q->snum<<" "<<q->tel<<" "<<endl;
j++;
p=(student)malloc(sizeof(stu));
cout<<"请输入新的学生信息:"<<endl;
cout<<"姓名:";
cin>>p->name;
cout<<endl;
cout<<"学号:";
cin>>p->number;
cout<<endl;
cout<<"年龄:";
cin>>p->age;
cout<<endl;
cout<<"性别:";
cin>>p->sex;
cout<<endl;
cout<<"家庭住址:" ;
cin>>p->add;
cout<<endl;
cout<<"入学时间:" ;
cin>>p->time;
cout<<endl;
cout<<"电话号码:";
cin>>p->tel;
l->next=q->next;
free(q);
goto tt;
}
else
{
l=q;
q=q->next;
}
}
cout<<endl;
if (j==0) cout<<"没找到你要的数据!"<<endl<<endl ;
tt:
while(!(m->next==NULL)&&(m->next->number<p->number))
m=m->next;
p->next=m->next;
m->next=p;
}
void putfile(student &s)
{
student p;
p=s->next;
FILE *fp;
if((fp=fopen("information.txt","w"))==NULL)
{
cout<<"打不开文件"<<endl<<endl;
exit(0);
}
while(p)
{
if(fwrite(p,sizeof(struct stu),1,fp)!=1 )
{
cout<<"文件写入错误"<<endl<<endl;
return;
}
p=p->next;
}
fclose(fp) ;
}
void getfile(student &s)
{
student p,q;
q=s;
FILE *fp1 ;
if((fp1=fopen("information.txt","r"))==NULL)
{
cout<<"打不开文件"<<endl;
exit(0);
}
cout<<"姓名 "<<"学号 "<<"性别 "<<"家庭住址 "<<"入学时间 "<<"宿舍号 "<<"电话号码"<<endl;
p=(student)malloc(sizeof(stu));
while(fread(p,sizeof(struct stu),1,fp1)!=0)
{
cout<<p->name<<" "<<p->number<<" "<<p->sex<<" "<<p->add<<" "<<p->time<<" "<<p->age<<" "<<p->tel<<endl;
while(!(q->next==NULL)&&(q->next->number<p->number))
q=q->next;
p->next=q->next;
q->next=p;
p=(student)malloc(sizeof(stu));
}
fclose(fp1);
cout<<endl;
}

3. 编写C++程序，按顺序列出某个目录下的所有文件的相对路径和最后修改时间。新手跪求大神指导源代码，感激

编写C++程序，按顺序列出某个目录下的所有文件的相对路径和最后修改时间是一项基础但重要的任务。本文将详细介绍如何实现这一功能。首先，我们需要包含必要的头文件，如iostream、string、direct.h和ctime，以支持输入输出、字符串操作、目录访问和时间处理。以下是一个基本的示例程序：

cpp
#include
#include
#include
#include

using namespace std;

// 显示指定目录下的所有文件
int ShowDir(string strDir) {
struct _finddata_t c_file;
long hFile;

if((hFile = _findfirst(strDir.c_str(), &c_file)) == -1L) {
return -1;
}

while(_findnext(hFile, &c_file) == 0) {
// 去除本级和上级目录
if(strcmp(".", c_file.name) == 0 || strcmp("..", c_file.name) == 0) {
continue;
}
// 输出文件名和最后修改时间
cout << "Name:" << c_file.name << " LastWrite:" << ctime(&c_file.time_write);
}

_findclose(hFile);
return 0;
}

int main(int argc, char *argv[]) {
string strDir = "D:\\rfc\\*.*";
if(0 != ShowDir(strDir)) {
cout << "Can not show dir:" << endl;
}
return 0;
}

此程序使用Windows特有的`_findfirst`和`_findnext`函数来遍历指定目录下的所有文件。请注意，这些函数仅适用于Windows平台。对于跨平台项目，建议使用第三方库如`boost filesystem`。

通过修改`ctime`函数的参数或使用其他时间格式化工具，可以自定义输出的日期和时间格式。此外，该程序可以进一步扩展，以支持用户输入目录路径或处理其他文件属性。

希望这段代码对你有所帮助。如果你在实现过程中遇到任何问题，请随时提问。