how do i convert this to a file.dat and delete, edit, add and display

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  12 years ago

  by ssaxer

  Sacha Saxer

  , Switzerland

  Joined 13 years ago

  can anyone plzzz help me with this....basically i have to rewrite the program so that the data will store permanently in a file and it can be retrieved for adding, editing and deleting......

  how do i do this.....

  this is the code....

   

  # include <iostream>

  # include <string>

  # include <cctype>

  # include <iomanip>

  using namespace std;

  struct student // the structure of the students marks

  {

  // storage

  string id;

  float phy;

  float chem;

  float peng;

  float math;

  }marks [200];

  void menu (); // function for menu

  void help (); // function for help

  void add (); // function for new

  void edit (); // function for edit

  void del (); // function for delete

  void display (); // function for display

  void exit (); // function for exit

  int z = 0; // storage that will set the integer value so that when run in the main program it wont turn 0

  // function main begins program execution

  int main ()

  {

  // storage

  char choice;int n=0;

   

  while(1)

  {

  menu(); // call menu function

  cin >> choice;

  choice = toupper(choice); // change input to uppercase

  if(choice == '?')

  {

  system ("cls");

  help (); // call help function

  }

  else if(choice == '+')

  {

  system ("cls");

  add (); // call add function

  }

  else if(choice == '#')

  {

  system ("cls");

  edit (); // call edit function

  }

  else if(choice == '-')

  {

  system ("cls");

  del (); // call delete function

  }

  else if (choice == '=')

  {

  system ("cls");

  display (); // call display function

  }

  else if (choice == 'X')

  {

  system("cls");

  exit (); // call the exit function

  return 0;

  }

  else

  {

  cout << "Incorrect sign." << endl;

  system ("pause");

  system("cls");

  cout << endl;

  }

  };

  return 0; // indicate that program end successfully

  }// end function main

  // function menu begins program execution

  void menu()

  {

  // output

  cout << "----------------------------MENU-----------------------------" << endl;

  cout << setw(10)<< left << "1.HELP" << setw(5) << left << " -->" << " ?" << endl;

  cout << setw(10)<< left << "2.ADD" << setw(5) << left << " -->" << " +" << endl;

  cout << setw(10)<< left << "3.EDIT" << setw(5) << left << " -->" << " #" << endl;

  cout << setw(10)<< left << "4.DELETE" << setw(5) << left << " -->" << " -" << endl;

  cout << setw(10)<< left << "5.DISPLAY" << setw(5) << left << " -->" << " =" << endl;

  cout << setw(10)<< left << "6.EXIT" << setw(5) << left << " -->" << " X" << endl << endl << endl;

  cout << "P/S : If u have not entered any data, please do so before proceed to '#' and '='. Enter '+' to add new data." << endl << endl;

  cout << "Please enter your choice : ";

  }// end function menu

  // function help begins program execution

  void help()

  {

  // output

  cout << endl;

  cout << "This program basically will ask user to enter the students ID's and their exam marks for certain subjects. ";

  cout << "User can either add a new set of data by entering '+' sign, ";

  cout << "edit or make a correction in the data by entering '#' sign, ";

  cout << "delete a data by entering the '-' sign, and also display ";

  cout << "the data on the screen by entering '=' sign. To exit ";cout << "program, user should enter the letter 'X'.";

  cout << endl << endl;

  system("pause");

  }// end function help

  // function add begins program execution

  void add ()

  {

  char ans;

  int n;

  // call the goto loop

  loop:

  n=z;

  cout << "Enter ID [Eg : 07UEB01234] : ";

  fflush (stdin); // so that the program can read properly

  getline(cin,marks.id);

  // the for loop is to change the whole string to uppercase

  for (int j=0; j<((marks.id).length()); ++j)

  {

  (marks.id)[j]=toupper((marks.id)[j]);

  }

  a:

  cout << "Enter Physic's marks [Eg : 50] : ";

  cin >> marks.phy;

  if (marks.phy < 0 || marks.phy > 100)

  {

  cout << "Please enter between 0 - 100 only." << endl << endl;goto a;

  }

  b:

  cout << "Enter Chemistry's marks [Eg : 50] : ";

  cin >> marks.chem;

  if (marks.chem < 0 || marks.chem > 100)

  {

  cout << "Please enter between 0 - 100 only." << endl << endl;goto b;

  }

  c:

  cout << "Enter Pengajian Am's marks [Eg : 50] : ";

  cin >> marks.peng;

  if (marks.peng < 0 || marks.peng > 100)

  {

  cout << "Please enter between 0 - 100 only." << endl << endl;goto c;

  }

   

  d:

  cout << "Enter Math's marks [Eg : 50]: ";

  cin >> marks.math;

  if (marks.math < 0 || marks.math > 100)

  {

  cout << "Please enter between 0 - 100 only." << endl << endl;goto d;

  }

  z++;

   

  // call the goto loop

  aaa:

  cout << "Continue?. [Y(to add more data)/N(menu)] : ";

  cin >> ans;

  ans = toupper(ans);

  cout << endl << endl;

   

  if (ans == 'Y')

  goto loop;

  else if (ans != 'N')

  {

  cout << "Please enter Y or N only." << endl <<endl;goto aaa;

  }

  system("cls");

  }// end function add

  // function edit begins program execution

  void edit ()

  {

  // storage

  string id2;

  string ans;

  cout << "Please enter your ID no to edit : ";

  fflush (stdin);

  getline(cin,id2);

  // change the string to uppercase

  for (int j=0; j<(id2.length()); ++j)

  {

  id2[j]=toupper(id2[j]);

  }

   

  for(int n=0;n<=z;n++)

  {

  if(marks.id == id2)

  {

  // call the goto loop

  loop:

  cout << "FOUND!!. Which one would you like to edit [ID / PHYSIC / CHEMISTRY / PENG AM / MATHS ]: ";

  fflush (stdin);

  getline(cin,ans);

  // change the string to uppercase

  for (int j=0; j<(ans.length()); ++j)

  {

  ans[j]=toupper(ans[j]);

  }

   

  if(ans == "ID")

  {

  marks.id=" ";cout << "Please enter new ID number : ";

  fflush (stdin);

  getline(cin,marks.id);

  for (int j=0; j<((marks.id).length()); ++j)

  {

  (marks.id)[j]=toupper((marks.id)[j]);

  }

  }

  else if(ans == "PHYSIC")

  {

  marks.phy=NULL;

  cout << "Please enter new Physic's marks : ";

  cin >> marks.phy;

  }

  else if(ans == "CHEMISTRY")

  {

  marks.chem=NULL;

  cout << "Please enter new Chemistry's marks : ";

  cin >> marks.chem;

  }

  else if(ans == "PENG AM")

  {

  marks.peng=NULL;

  cout << "Please enter new Peng Am's marks : ";

  cin >> marks.peng;

  }

  else if(ans =="MATHS")

  {

  marks.math=NULL;

  cout << "Please enter new Maths's marks : ";

  cin >> marks.math;

  }

  else

  {

  cout << "Please enter the correct name [ID / PHYSIC / CHEMISTRY / PENG AM / MATHS ]" << endl << endl;goto loop;

  }

  system("cls");

  break;

  }

  if(marks.id != id2 && n == z)

  {

  cout << "Sorry, data not found" << endl;system ("pause");

  cout << endl;

  system ("cls");

  }

  }

  }// end function edit

  // function delete begins program execution

  void del ()

  {

  string id3;

  cout << "Please enter the ID number to delete the whole data : ";

  fflush (stdin);

  getline(cin,id3);

  for (int j=0; j<(id3.length()); ++j)

  {

  id3[j]=toupper(id3[j]);

  }

   

  for(int n=0;n<=z;n++)

  {

  if(marks.id == id3)

  {

  marks.id = " ";

  marks.phy = marks.chem = marks.peng = marks.math = NULL;

  cout << "Data found and has been deleted." << endl;

  system ("pause");

  system("cls");break;

  }

  if(marks.id != id3 && n == z)

  {

  cout << "Sorry, data not found. " << endl;

  system("pause");system("cls");

  }

  }

  }// end function del

  // function dislay begins program execution

  void display ()

  {

  cout << setw(15) << left << "ID" << setw(10) << left << "PHY" << setw(10) << left << "CHEM" << setw(10) << left << "PENG" << setw(10) << left << "MATH";

  cout << endl << endl;

  //for loop that is use to display the structure up to interger z

  for (int n=0; n<z; n++)

  {

  // if is use to only diplay structure that is not empty

  if(marks.id != " " && marks.phy != NULL && marks.chem != NULL && marks.peng != NULL && marks.math != NULL)

  cout << setw(15) << left << marks.id << setw(10) << left << marks.phy << setw(10) << left << marks.chem << setw(10) << left << marks.peng << setw(10) << left << marks.math ;

  cout << endl << endl;

  }

  cout << endl;

  system("pause");

  system ("cls");

  } // end function display

  // function exit begins program execution

  void exit ()

  {

  //output

  cout << "Thank you for using this program." << endl;

  }// end function exit

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• • Reply

  12 years ago

  by Mohammad Rastkar

  Mohammad Rastkar

  Shiraz, Iran

  Joined 14 years ago

  Take a look at these :

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