Base de dados

[meny]

Boa tarde

Será que alguém me pode ajudar não estou a conseguir resolver o problema do código.

#include <string>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <fstream>
#include <string>

using namespace std;

struct stu_data
{
   int id;
   string fn;
   string ln;
   char gender;
   string major;
   float cgpa;
};

void load (stu_data array[], int & n, ifstream & extract);
void insertion (stu_data array[], int & n, ifstream & extract);
void deletion (stu_data array[], int & n);
void searching (stu_data array[], int & n);
void printing (stu_data array[], int & n);
void dump (stu_data array[], int & n, ofstream & write);

int main()
{
   string s;
   ifstream read;
   ifstream extract;
   ofstream write;

   cout<<"Enter the name of the data file: ";
   cin>>s;

   read.open(s.c_str());
   if (!read)
   {
       cout<<"Input file open error\n";
   }

   write.open("a.txt");
   if(!write)
   {
       cout<<"Output file open error\n";
   }


   cout<<"\n\t\tStudent Database.";
   cout<<"\n\nNB: Enter full name, full ID, entire CGPA, abreviated Gender \n"
   <<" (M for Male or F for Female) and abreviated Major (EEE, CSE, etc), \n"
   <<" for double major use comma in-between, followed by a space.\n\n";

   for (int x = 0; x < 70; x++)
   {
       cout<<"|";
   }

   cout<<endl<<endl;

   int stu_n = 0;
   stu_data array[20];

   for (char quit = 'a'; quit != 'q'; )
   {
       char choice = 'z';

       cout<<"\nEnter choices...............\n"
       <<"To insert data...... press i\n"
       <<"To delete data.......press d\n"
       <<"To search data.......press s\n"
       <<"To print data........press p\n"
       <<"To quit program......press q\n"
       <<"Enter choice now............: ";
       cin>>choice;

       cout<<endl;

       // insertion
       if (choice == 'i')
       {
           insertion (array, stu_n, extract);
       }

       // deletion
       else if (choice == 'd')
       {
           deletion (array, stu_n);
       }

       // searching
       else if (choice == 's')
       {
           searching (array, stu_n);
       }

       // printing
       else if (choice == 'p')
       {
           printing (array, stu_n);
       }

       // exit
       else if (choice == 'q')
       {
           dump (array, stu_n, write);
           quit = choice;
       }

       // invalid
       else
       {
           cout<<"Invalid Input\n";

       }
   }

   return 0;
}

void load (stu_data array[], int & n, ifstream & extract)
{
   extract.open("a.txt");
   int id_n;
   string fn_n;
   string ln_n;
   char gen;
   string maj;
   float gpa;

   while(extract>>id_n>>fn_n>>ln_n>>gen>>maj>>gpa)
   {
       array[n].id = id_n;
       array[n].fn = fn_n;
       array[n].ln = ln_n;
       array[n].gender = gen;
       array[n].major = maj;
       array[n].cgpa = gpa;

       n = n + 1;
   }
}

void insertion (stu_data array[], int & n, ifstream & extract)
{
   load (array, n, extract);
   const int z = 40;

   // ID
   cout<<" ID: ";
   cin>>array[n].id;

   // First Name
   cout<<" First Name: ";
   cin>>array[n].fn;

   // Last Name
   cout<<" Last Name: ";
   cin>>array[n].ln;

   // Gender
   cout<<" Sex: ";
   cin>>array[n].gender;

   // GPA
   cout<<"CGPA : ";
   cin>>array[n].cgpa;

   // Major
   cout<<"Major: ";
   cin>>array[n].major;

   int id_n;
   string f_n;
   string l_n;
   char gen;
   string maj;
   float gpa;

   for (int i = n - 1; i >= 0; i--)
   {
       if (array[i + 1].fn.compare(array[i].fn) < 0)
       {
           id_n = array[i].id;
           array[i].id = array[i + 1].id;
           array[i + 1].id = id_n;

           f_n = array[i].fn;
           array[i].fn = array[i + 1].fn;
           array[i + 1].fn = f_n;

           l_n = array[i].ln;
           array[i].ln = array[i + 1].ln;
           array[i + 1].ln = l_n;

           gen = array[i].gender;
           array[i].gender = array[i + 1].gender;
           array[i + 1].gender = gen;

           maj = array[i].major;
           array[i].major = array[i + 1].major;
           array[i + 1].major = maj;

           gpa = array[i].cgpa;
           array[i].cgpa = array[i+1].cgpa;
           array[i+1].cgpa = gpa;
       }
   }

   n = n + 1;
}

void deletion (stu_data array[], int & n)
{
   char delet;

   cout<<"To delete using ID .......press........i\n"
   <<"................Name......press .......n\n"
   <<"Enter now.......: ";
   cin>>delet;

   int i;
   if (delet == 'i') // id delete
   {
       int delet_i;
       int box;

       int bread_crum = -1;

       cout<<"Provide the id of the student you want to remove: ";
       cin>>delet_i;

       for(i = 0; i < n; i++)
       {
           if(array[i].id == delet_i)
           {
               box = i;
               bread_crum = 1;
               break;
           }
       }

       if (bread_crum > 0)
       {
           array[box].id = array[n - 1].id;
           array[box].fn = array[n - 1].fn;
           array[box].ln = array[n - 1].ln;
           array[box].gender = array[n - 1].gender;
           array[box].major = array[n - 1].major;
           array[box].cgpa = array[n - 1].cgpa;

           n--;

           cout<<"\nStudent information has been deleted!\n";
       }
       else
       {
           cout<<"\nStudent cant be deleted, there is no such record.\n";
       }
   }


}

void searching (stu_data array[], int & n)
{
   const int z = 40;
   char search = 'x';
   int s_id;

   int i,j;

   cout<<"To search using Name.....press n\n"
   <<"To search using ID.......press i\n"
   <<"Enter now......:";

   cin.clear();
   cin.ignore();
   cin>>search;


   // id search
   if (search == 'i')
   {
       cout<<"Enter the ID for searching: ";
       cin>>s_id;

       int x = 0;

       for (j = 0; j <= n; j++)
       {
           if (array[j].id == s_id)
           {
               x = j;
               break;
           }
       }

       if (array[x].id == s_id)
       {
           cout<<"\nID has been found\n";
       }

       else
       {
           cout<<"\nID is not in the database\n";
       }
   }
}
void printing (stu_data array[], int & n)
{
   int x, i;

   cout<<"ID"<<setw(15)<<"Names"<<setw(20)<<"Sex"<<setw(7)<<"CGPA"<<setw(9)<<"Major";
   cout<<endl;

   for(i = 0; i < n; i++)
   {
       cout<<array[i].id<<"";
       cout<<setw(5)<<"";

       cout<<array[i].fn<<"";
       cout<<" "<<array[i].ln<<"";
       x = array[i].ln.length() + array[i].fn.length();
       cout<<setw(22 - x)<<"";


       cout<<array[i].gender<<"";
       cout<<setw(4)<<"";

       cout<<showpoint<<setprecision(3)<<array[i].cgpa<<"";
       cout<<setw(5)<<"";

       cout<<array[i].major<<"";
       x = array[i].major.length();
       cout<<setw(10 - x)<<"";

       cout<<endl;
   }
}
void dump (stu_data array[], int & n, ofstream &write)
{
   int i;

   for(i = 0; i < n; i++)
   {
       write<<array[i].id;
       write<<array[i].fn;
       write<<array[i].ln;
       write<<array[i].gender;
       write<<array[i].cgpa;
       write<<array[i].major<<endl;
   }
}

EDIT: código adaptado de http://www.cplusplus.com/forum/beginner/41740/

[HappyHippyHippo]

e qual é o problema ?

tens a noção da quantidade de código que apresentas ?

ainda por cima sem usar as tags do GeSHi ... e indentação ...

[FreiNando]

O programa compila sem erros.

A não ser que isso seja um trabalho da aula de inglês, parece não ter sido feito por ti...

Diz o que queres fazer e onde tens o problema.

Nota: Seria bom quando apresentarem código de terceiros referir a fonte. O autor do original ficaria agradecido.

por exemplo: código fornecido por Maestro em http://www.cplusplus.com/forum/beginner/41740/ onde indicou que tinha problema na função load.

Edited April 6, 2014 by FreiNando