برنامه پایگاه داده ابتدایی با استفاده از struct

توجه: برنامه کامل نیست. قسمت پایگاه داده کامل شده اما قسمت انجام عملیات ناقص است!

 

#include <iostream>
#include <conio.h>
#include<string.h>
using namespace std;
struct student {
string f_name;
string l_name;
string std_no;
string code;
int total_pass;
double num[100]={-1};
double ave;
};
main()
{
   student* std;
   int c,i,j;
   cout<<"please enter number of student: ";
   cin>>c;
   std=new student[c];
    cout<<endl<<"----please complete information of each student----"<<endl<<endl;
   for( i=0;i<c;i++)
    {
    cout<<"fname: ";
    cin>>std[i].f_name;

    cout<<"lname: ";
    cin>>std[i].l_name;

    cout<<"studebt NO: ";
    cin>>std[i].std_no;

    cout<<"Code: ";
    cin>>std[i].code;

    cout<<"Pass course: ";
    cin>>std[i].total_pass;

    for(int j=0;j<std[i].total_pass;j++)
    {
        cout<<"course "<<j+1<<" : ";
        cin>>std[i].num[j];
    }

    cout<<"average: ";
    cin>>std[i].ave;

    cout<<endl<<"-----------------------"<<endl;
    }
    int select;
    cout<<"now select number for do task "<<endl;
cout<<"1>>sort student by lname and print"<<endl;
cout<<"2>>sort student by average and print"<<endl;
cout<<"3>>print informations of pass student in all course or have only one unpass "<<endl<<endl;
cout<<">>> ";
cin>>select;

if(select==1)
{

}

else if(select==2)
{double temp;
string stemp;
     for( i=0;i<c;i++){

         for(j=i+1;j<c;j++){
         if(std[i].ave>std[j].ave)
         {
                      temp=std[i].ave;
                      std[i].ave=std[j].ave;
                      std[j].ave=temp;

                      stemp=std[i].f_name;
                      std[i].f_name=std[j].f_name;
                      std[j].f_name=stemp;

                      stemp=std[i].l_name;
                      std[i].l_name=std[j].l_name;
                      std[j].l_name=stemp;

                      stemp=std[i].f_name;
                      std[i].f_name=std[j].f_name;
                      std[j].f_name=stemp;

                      stemp=std[i].std_no;
                      std[i].std_no=std[j].std_no;
                      std[j].std_no=stemp;

                      stemp=std[i].code;
                      std[i].code=std[j].code;
                      std[j].code=stemp;

                      }}}

                      cout<<" ---sort by average--- "<<endl;
                      for( i=0;i<c;i++)
                      cout<<std[i].ave<<"\t";
                      cout<<endl;

}

 getch();
}