这是我今天写的一部分代码，领会精神。建议做链表时先画图分析一下数据结构，你可以先看一下别人的代码，先分析别人的代码，然后试试自己编一个简单的（没有参照的编程）。看一下数据结构方面的书会对你学习链表有很大的帮助。记着要勤加练习哦！
#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>
#include <windows.h>
static int n;
struct student
{
int stu_number;
char stu_name[10];
char stu_sex[4];
int stu_age;
int math;
int english;
int cplu_plus;
int total;
float average;
};
class stu
{
student boy;
public:
int getnum();
void in_put(student *p1,int num);
void in_file(struct student *p,int number);
void readout(struct student *p);
void A_caculate(struct student *p);
void T_caculate(struct student *p);
int Cacu_aver(struct student *p,int number);
int Cacu_total(struct student *p,int number);
void out_put(struct student *p);
};
void stu::in_put(student *p1,int num)
{
int i;
for (i=0;i<num;i++)
{
cout<<"学号:"<<endl;
cin>>p1[i].stu_number;
cout<<"姓名:"<<endl;
cin>>p1[i].stu_name;
cout<<"性别:"<<endl;
cin>>p1[i].stu_sex;
cout<<"年龄:"<<endl;
cin>>p1[i].stu_age;
cout<<"数学成绩:"<<endl;
cin>>p1[i].math;
cout<<"英语成绩:"<<endl;
cin>>p1[i].english;
cout<<"c++成绩:"<<endl;
cin>>p1[i].cplu_plus;
p1[i].total=0;
p1[i].average=0;
system("cls");
}
}
void stu::in_file(struct student *p,int number)
{
int i;
ofstream ofs("feifei.txt",ios::out);
if (!ofs)
{
cerr<<"can not open the file!"<<endl;
exit(1);
}
else
{
for (i=0;i<number;i++)
{
ofs<<p[i].stu_number<<'\n'
<<p[i].stu_name<<'\n'
<<p[i].stu_sex<<'\n'
<<p[i].stu_age<<'\n'
<<p[i].math<<'\n'
<<p[i].english<<'\n'
<<p[i].cplu_plus<<'\n';
}
cout<<endl<<"data has been writen into the computer!"<<endl;
ofs.close();
}
}
void stu::readout(student *p)
{
int i,m;
ifstream ifs("feifei.txt",ios::in|ios::binary);
if (!ifs)
{
cerr<<"can not open the file!"<<endl;
exit(1);
}
else
{
for (i=0;i<n;i++)
{
}
}
ifs.close();
}
void stu::T_caculate(struct student *p)
{
int i,j;
struct student temp;
for (i=0;i<n;i++)
{
p[i].total=p[i].math+p[i].english+p[i].cplu_plus;
cout<<p[i].stu_name<<"的总成绩为:"<<p[i].total<<endl;
}
for (i=0;i<n;i++)
{
for (j=i+1;j<n;j++)
{
if (p[i].total>p[j].total)
{
temp=p[j];
p[j]=p[i];
p[i]=temp;
}
}
}
}
void stu::A_caculate(struct student *p)
{
int i,j;
struct student temp;
for (i=0;i<n;i++)
{
for (j=i+1;j<n;j++)
{
if (p[i].stu_age>p[j].stu_age)
{
temp=p[j];
p[j]=p[i];
p[i]=temp;
}
}
}
}
int stu::Cacu_aver(struct student *p,int number)
{
int i,flag=1;
for (i=0;i<n;i++)
{
p[i].average=(p[i].math+p[i].english+p[i].cplu_plus)/3.0;
if (p[i].stu_number==number)
{
cout<<p[i].stu_name<<"的平均成绩是"<<p[i].average<<endl;
flag=0;
}
}
if (flag!=0&&i==n)
{
cout<<"!您输入的号码不存在，请查证后重新输入"<<endl;
}
return flag;
}
int stu::Cacu_total(struct student *p,int number)
{
int i,flag=1;
for (i=0;i<n;i++)
{
p[i].total=p[i].math+p[i].english+p[i].cplu_plus;
if (p[i].stu_number==number)
{
cout<<p[i].stu_name<<"的总成绩是"<<p[i].total<<endl;
flag=0;
}
}
if (flag!=0&&i==n)
{
cout<<"-------------------!您输入的号码不存在，请查证后重新输入---------------"<<endl;
}
return flag;
}
void stu::out_put(struct student *p)
{
int i;
cout<<"student's information list here:"<<endl<<endl;
cout<<" "<<setw(10)<<right<<"学号"<<" "<<setw(8)<<left<<"姓名"<<setw(6)<<left<<"性别"<<setw(6)<<right<<"年龄";
cout<<setw(6)<<right<<"数学"<<setw(6)<<right<<"英语"<<setw(6)<<right<<"c++";
cout<<setw(8)<<right<<"总成绩"<<setw(10)<<right<<"平均成绩"<<endl;
for (i=0;i<n;i++)
{
cout<<"第"<<i+1<<"名"<<setw(10)<<right<<p[i].stu_number<<" "<<setw(8)<<left<<p[i].stu_name;
cout<<setw(6)<<left<<p[i].stu_sex<<setw(6)<<right<<p[i].stu_age<<setw(6)<<right<<p[i].math;
cout<<setw(6)<<right<<p[i].english<<setw(6)<<right<<p[i].cplu_plus;
if (p[i].total!=0)
{
cout<<setw(8)<<right<<p[i].total;
}
if (p[i].average!=0)
{
cout<<setw(10)<<right<<p[i].average;
}
cout<<endl<<endl;
}
}
int main()
{
stu boy;
student *per,*outp;
int m;
cout<<"请从下面的菜单中选出您所要进行的操作选项："<<endl<<endl;
do
{
cout<<"1.输入学生信息并保存到文件"<<endl;
cout<<"2.按年龄从大到小显示学生各项信息"<<endl;
cout<<"3.按各门成绩由高到低显示学生信息"<<endl;
cout<<"4.输入学号计算学生平均成绩并显示"<<endl;
cout<<"5.输入学号计算学生总成绩并显示"<<endl;
cout<<"6.按学生总成绩排名并显示排名结果"<<endl;
cout<<"7.退出所在系统"<<endl;
cin>>m;
system("cls");
switch (m)
{
case 1:
{
cout<<"please input the number of students you want to input:"<<endl;
cin>>n;
per=new student[n];
boy.in_put(per,n);
boy.in_file(per,n);
delete []per;
break;
}
case 2:
{
outp=new student[n];
boy.readout(outp);
boy.A_caculate(outp);
boy.out_put(outp);
delete[]outp;
break;
}
case 3:
{
outp=new student[n];
boy.readout(outp);
boy.T_caculate(outp);
boy.out_put(outp);
delete[]outp;
break;
}
case 4:
{
int number,flag;
char flag1;
outp=new student[n];
boy.readout(outp);
do
{
cout<<"please input the number of the students you want to find:"<<endl;
cin>>number;
flag=boy.Cacu_aver(outp,number);
if (flag==1)
{
cout<<"do you want to input again?'Y'/'N'"<<endl;
cin>>flag1;
}
else
break;
}
while (flag1=='y'||flag1=='Y');
boy.in_file(outp,n);
delete[]outp;
break;
}
case 5:
{
int number,flag;
char flag1;
outp=new student[n];
boy.readout(outp);
do
{
cout<<"please input the number of the students you want to find:"<<endl;
cin>>number;
flag=boy.Cacu_total(outp,number);
if (flag==1)
{
cout<<"do you want to input again?'Y'/'N'"<<endl;
cin>>flag1;
}
else
break;
}
while (flag1=='y'||flag1=='Y');
boy.in_file(outp,n);
delete[]outp;
break;
}
case 6:
{
outp=new student[n];
boy.readout(outp);
boy.out_put(outp);
break;
}
}
}
while (m!=7);
return 0;
}
简单的提示你一下，要自己多联系的，不然很难学好