谢谢你，我看的是C++从入门到实践这本书的第十章本章实例中的
#include<string.h>
#include<iostream.h>
#include<fstream.h>
#include<iomanip.h>
using namespace std;
struct student
{
string name;
string course;
int score;
};
void dispdata()
{
ifstream file("student.dat");
student my_student;
cout<<"输出全部学生成绩:"<<endl;
cout<<setw(12)<<"姓名"<<setw(8)<<"课程"<<setw(12)<<"成绩"<<endl;
while(file.read((char*)&my_student,sizeof(student)))//非常重要
{
cout<<setw(12)<<my_student.name
<<setw(8)<<my_student.course
<<setw(12)<<my_student.score<<endl;
}
file.close();//关闭文件；
}
/*查找数据*/
void fidata()
{
char sname[6];
bool iffind=false;
ifstream file("student.dat");
student mystudent;
file.seekg(0);
cout<<"输入要查询的学生的姓名:"<<endl;
cin>>sname;
cout<<setw(12)<<"姓名"<<setw(8)<<"课程"<<setw(12)<<"分数"<<endl;
while(file.read((char*) &mystudent,sizeof(mystudent)))//为什么读取文件函数的第一个参量一定是字符型的？
{
if(mystudent.name==sname)
{
iffind=true;
cout<<setw(12)<<mystudent.name
<<setw(8)<<mystudent.course
<<setw(12)<<mystudent.score<<endl;
}
if(!iffind)
cout<<"没有这个学生!";
file.close();
}
/*添加数据*/
int addata()
{
student mystudent;
fstream file("student.dat",ios::out|ios::app);
cout<<"添加数据(姓名 课程 分数):";
cin>>mystudent.name;
cin>>mystudent.couse;
cin>>mystudent.score;
file.write((char*) &mystudent,sizeof(student));
file.close();
return 0;
}
int main()
{
int select;
cin>>select;
do
{
cout<<"choose 1:输出全部学生成绩"<<endl;
cout<<" 2:按姓名查询成绩"<<endl;
cout<<" 3:添加新成绩"<<endl;
switch(select)
{
case 1:dispdata();break;
case 2:fidata();break;
case 3:addata();break;
default:break;
}
}while(select==1||select==2||select==3);
return 0;
}
--------------------Configuration: ten_1ex - Win32 Debug--------------------
Compiling...
ten_1ex.cpp
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(5) : error C2871: 'std' : does not exist or is not a namespace
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(8) : error C2146: syntax error : missing ';' before identifier 'name'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(8) : error C2501: 'string' : missing storage-class or type specifiers
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(8) : error C2501: 'name' : missing storage-class or type specifiers
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(9) : error C2146: syntax error : missing ';' before identifier 'course'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(9) : error C2501: 'string' : missing storage-class or type specifiers
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(9) : error C2501: 'course' : missing storage-class or type specifiers
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(21) : error C2039: 'name' : is not a member of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(7) : see declaration of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(22) : error C2039: 'course' : is not a member of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(7) : see declaration of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(40) : error C2039: 'name' : is not a member of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(7) : see declaration of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(44) : error C2039: 'name' : is not a member of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(7) : see declaration of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(45) : error C2039: 'course' : is not a member of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(7) : see declaration of 'student'
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(53) : error C2601: 'addata' : local function definitions are illegal
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(65) : error C2601: 'main' : local function definitions are illegal
D:\Program Files\MSDev98\MyProjects\ten_1ex\ten_1ex.cpp(83) : fatal error C1004: unexpected end of file found
Error executing cl.exe.
ten_1ex.obj - 15 error(s), 0 warning(s)
求指点，是在不知道那儿错了 |
