----------学生信息管理系统-------

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <stdlib.h>
using namespace std;
struct student_message
{
int student_num;
char student_name[15];
char student_sex[15];
double sub_a,sub_b,sub_c,sub_d,sub_e;
double sub_ave;
double sub_sum;
int mingci;
} data[100];
int ji=0,n,x,tmp=1;
void del(int m)
{
for(int i=1; i<=n+ji-1; i++)
{
if(data[i].student_num==m)
{
for(int j=i; j<=n+ji-1; j++)
{
data[j]=data[j+1];
}
ji--;
break;
}
}
if(data[n+ji].student_num==m)
ji--;
}
void xiugai(int m)
{
for(int i=1; i<=n+ji; i++)
{
if(data[i].student_num==m)
{
char name[15],sex[15];
double a,b,c,d,e;
cout<<"名字"<<endl;
cin>>name;
strcpy(data[i].student_name,name);
cout<<"性别"<<endl;
cin>>sex;
strcpy(data[i].student_sex,sex);
cout<<"成绩"<<endl;
cin>>a>>b>>c>>d>>e;
data[i].sub_a=a;
data[i].sub_b=b;
data[i].sub_c=c;
data[i].sub_d=d;
data[i].sub_e=e;
data[i].sub_sum=data[i].sub_a+data[i].sub_b+data[i].sub_c+data[i].sub_d+data[i].sub_e;
data[i].sub_ave=data[i].sub_sum/5;
break;
}
}
}
void showall()
{
for(int i=1; i<=ji+n; i++)
{
cout<<data[i].student_num<<" "<<data[i].student_name<<" "<<data[i].student_sex<<" ";
cout<<data[i].sub_a<<" "<<data[i].sub_b<<" "<<data[i].sub_c<<" "<<data[i].sub_d<<" "<<data[i].sub_e<<" ";
cout<<data[i].sub_ave<<" "<<data[i].sub_sum<<" "<<data[i].mingci<<endl;
}
}
void show(int m)
{
for(int i=1; i<=n+ji; i++)
{
if(data[i].student_num==m)
{
cout<<data[i].student_num<<" "<<data[i].student_name<<" "<<data[i].student_sex<<" ";
cout<<data[i].sub_a<<" "<<data[i].sub_b<<" "<<data[i].sub_c<<" "<<data[i].sub_d<<" "<<data[i].sub_e<<" ";
cout<<data[i].sub_ave<<" "<<data[i].sub_sum<<" "<<data[i].mingci<<endl;
break;
}
}
}
int cmp(const student_message &a,const student_message &b)
{
return a.sub_ave>b.sub_ave;
}
void paimingci()
{
for(int i=1; i<=n+ji; i++)
{
//cout<<"Aaaaaaaaaaaaaa"<<endl;
data[i].mingci=i;
}
}
void save(char *filename)
{
FILE *fp=fopen(filename,"at");
for(int i=tmp; i<=ji+n; i++)
{
fprintf(fp,"%d %s %s %.2lf %.2lf %.2lf %.2lf %.2lf %.2lf %.2lf %d\n",data[i].student_num,data[i].student_name,data[i].student_sex,data[i].sub_a,data[i].sub_b,data[i].sub_c,data[i].sub_d,data[i].sub_e,data[i].sub_ave,data[i].sub_sum,data[i].mingci);
}
fclose(fp);
tmp=ji+n;
return ;
}
void read(char *filename)
{
char temp;
FILE *fp;
fp=fopen(filename,"r");
while((temp=fgetc(fp))!=EOF)
{
cout<<temp;
}
fclose(fp);
return;
}
void build()
{
cout<<"请输入新建文件名称: ";
}
int main()
{
cout<<"1、增加学生信息 "<<"  "<<"6、对学生信息进行排序 "<<endl;
cout<<"2、修改学生信息 "<<"  "<<"7、保存学生信息至记录文件 "<<endl;
cout<<"3、显示学生信息 "<<"  "<<"8、从记录文件读取学生信息 "<<endl;
cout<<"4、查询学生信息 "<<"  "<<"9、新建学生信息文件 "<<endl;
cout<<"5、删除学生信息 "<<"  "<<"0、运行结束 "<<endl;
cin>>n;
for(int i=1; i<=n; i++)
{
cin>>data[i].student_num>>data[i].student_name>>data[i].student_sex;
cin>>data[i].sub_a>>data[i].sub_b>>data[i].sub_c>>data[i].sub_d>>data[i].sub_e;
data[i].sub_sum=data[i].sub_a+data[i].sub_b+data[i].sub_c+data[i].sub_d+data[i].sub_e;
data[i].sub_ave=data[i].sub_sum/5;
paimingci();
}
int chs;
cin>>chs;
while(1)
{
switch(chs)
{
case 1:
cout<<"输入学生信息"<<endl;
ji++;
cin>>data[n+ji].student_num>>data[ji+n].student_name>>data[ji+n].student_sex;
cin>>data[ji+n].sub_a>>data[ji+n].sub_b>>data[ji+n].sub_c>>data[ji+n].sub_d>>data[ji+n].sub_e;
data[ji+n].sub_sum=data[ji+n].sub_a+data[ji+n].sub_b+data[ji+n].sub_c+data[ji+n].sub_d+data[ji+n].sub_e;
data[ji+n].sub_ave=data[ji+n].sub_sum/5;
paimingci();
break;
case 2:
cout<<"输入所要修改的学生学号"<<endl;
cin>>x;
xiugai(x);
cout<<"修改完成"<<endl;
break;
case 3:
showall();
break;
case 4:
cout<<"输入所要显示的学生学号"<<endl;
cin>>x;
show(x);
break;
case 5:
cout<<"输入所要删除的学生学号"<<endl;
cin>>x;
del(x);
paimingci();
break;
case 6:
sort(data+1,data+ji+n+1,cmp);
paimingci();
showall();
break;
case 7:
save("学生信息管理系统.txt");
break;
case 8:
read("学生信息管理系统.txt");
break;
case 9:
build();
break;
case 0:
return 0;
default:
cout<<"您输入的编号不在操作步骤里面，请重新选择谢谢"<<endl;
break;
}
cin>>chs;
}
return 0;
}