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C++ help.

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  • 28-07-2011 9:55pm
    #1
    Cork24
    Closed Accounts Posts: 2,663 ✭✭✭


    ok, I found this little Assignment online, and to keep me going and up to shape on my Programming Skills. by the looks of things i lost it but any way.

    I trying to alter Details and add a Record to end of a File.

    here is my Code.
    #include <iostream>
#include<string>
#define N_STUDENT 10 //Max size of Students
//#define STACK_SIZE  10 // Max size of the Stack

//*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/
        
using namespace std;
int x[N_STUDENT];
struct  student
{
    int student_number;              // Student number of student
    string studentname;             // Name of student
    string Address;                //Address of Student
    int date_registered;           // Date Registered
    string CourseName;            // Name of Course 
    int Marks;                     // Course Mark 
};

student record[N_STUDENT];
//*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/
        

int main ()
{
        
    for (n = 0; n < N_STUDENT;n++)
    {
           while((cout<<"Enter Student Number: ")&&(!(cin>>record[n].student_number)||record[n].student_number<0)){
            cout<<"Invalid Input! Please Enter Student Number "<<endl;
            cin.clear();
            cin.ignore(1000,'\n'); 
        }
        
        cout << "Enter Student  Name: ";
        cin >> record[n].studentname;
        
        cout << "Enter Student Address: ";
        cin >> record[n].Address;        
        
        while((cout<<"Enter Date: ")&&(!(cin>>record[n].date_registered)||record[n].date_registered<0)){
            cout<<"Invalid Input! Please Enter Date"<<endl;
            cin.clear();
            cin.ignore(1000,'\n'); 
        }
        
        cout << "Enter Course Name: ";
        cin >> record[n].CourseName;
        
            while((cout<<"Enter Marks: ")&&(!(cin>>record[n].date_registered)||record[n].date_registered<0)){
            cout<<"Invalid Input! Please Enter Marks"<<endl;
            cin.clear();
            cin.ignore(1000,'\n'); 
    }
//*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/
        
     bool Exit = false;
    
    while (!Exit)
    {
        int choice;
        
        cout << endl;
        cout << "=======================================" << endl;
        cout << "                                       " << endl;
        cout << " WELCOME TO STUDENT RECORD             " << endl;
        cout << "                                       " << endl;
        cout << "=======================================" << endl;
        cout << "Select Action: " << endl;
        cout << "1) Save All Records to Text File" << endl;
        cout << "2) Add Additional Students to File" << endl;
        cout << "3) Read and Display the Contents of File" << endl;
        cout << "4) Alter any Attributes of a Student Detail" << endl;
        cout << "5) Add the Array to a Stack" << endl;
        cout << "6) Display Studetns who have not been deleted" << endl;
        cout << "7) Exit" <<endl;
        cout << "=======================================" << endl;
        cout << "Enter choice: ";
        cin >> choice;
    
//*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/
                
        
        if (choice == 7) // Quits Program..
            
            
        {
            cout<< "Exit Program" << endl;
            Exit = true; 
        }
        
        
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/   
      else if (choice == 6) // Display Students who have not been deleted
      {
           
      }
        
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/   
        else if (choice == 4) // Alter Attributes of a Student Detail 
        
        {
             void updateDetails(fstream & file) //this is the update function
{
             
S rec;
long len; 
int regNumb;
char option;

file.open("student.txt", ios::in|ios::out| ios::binary);

len = sizeof(S);

cout<<"Enter registration number of student to be update:"<<endl;
cin>>regNumb;

file.seekg (0,ios::beg); //0 bytes from beginning of file(ios::beg) 
file.read(reinterpret_cast<char*>(&rec),len);

while (!( file.eof())) 
{ 
if (regNumb == rec.regisNumb)
{
cout<<"What kind of attribute do you want to update?"<<endl;

menu (option);

cout<<"A -Registration number"<<endl;
cout<<"B -Name of the student"<<endl;
cout<<"C -Student address"<<endl;
cout<<"D -Date of registration"<<endl;
cout<<"E -Name of the modules"<<endl;
cout<<"F -Mark of modules"<<endl;
cout<<"G -Exit"<<endl;

switch(option)

{
case 'A' :
{
cout<<"Enter registration number:"<<endl;
cin>>rec.regisNumb;
break;
}
case 'B' :
{
cout <<"Enter name of student:"<<endl;
cin.getline(rec.name, MAXNAME);
break;
}
case 'C':
{
cout <<"Enter student address:"<<endl;
cin.getline(rec.address,30);
break;
}
case 'D':
{ 
cout <<"Enter day of registration:"<<endl; 
cin>>rec.datRegi.day;
cout <<"Enter month of registration:"<<endl; 
cin>>rec.datRegi.month;
cout <<"Enter year of registration:"<<endl; 
cin>>rec.datRegi.year;
break;
}
case 'E':
{
cout <<"Enter name of modules:"<<endl;
for(int j=0;j<rec.arraysize; j++) 
{
cin>>rec.modArray[j].moduleName;
cout<<endl;
}
break;
}
case 'F':
{
cout <<"Enter module marks:"<<endl;
for(int j=0;j<rec.arraysize; j++) 
{
cout<<rec.modArray[j].moduleMark<<endl;
}
break;
}
case 'G':
{
cout<<"Exit"<<endl;
break;
} 
} 

int pos = file.tellg();

int offset = pos-len; //one record less in size

file.seekp(offset, ios::beg); 

file.write( reinterpret_cast<char *>( &rec),sizeof(S)); 

return;
}
file.read( reinterpret_cast<char *>( &rec), sizeof(S));
}
cout<<"Student not found"<<endl;
file.close();
}
} 
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/   
      else if (choice == 5) // Add to Stack
      {
           
      }
        
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ 


      else if (choice == 3) // Read and Display the Contents of File
      {
           
      }
        
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/   
      else if (choice == 2) // Add Additional Students to File
      {
            S rec;

            ofstream og;

            og.open(FILENAME,   ios:: out |ios::app|ios:: binary);


      for (n = 0; n < N_STUDENT;n++)
    {
           while((cout<<"Enter Student Number: ")&&(!(cin>>record[n].student_number)||record[n].student_number<0)){
            cout<<"Invalid Input! Please Enter Student Number "<<endl;
            cin.clear();
            cin.ignore(1000,'\n'); 
        }
        
        cout << "Enter Student  Name: ";
        cin >> record[n].studentname;
        
        cout << "Enter Student Address: ";
        cin >> record[n].Address;        
     
             while((cout<<"Enter Date: ")&&(!(cin>>record[n].date_registered)||record[n].date_registered<0)){
            cout<<"Invalid Input! Please Enter Date"<<endl;
            cin.clear();
            cin.ignore(1000,'\n'); 
        }
        
        cout << "Enter Course Name: ";
        cin >> record[n].CourseName;
        
            while((cout<<"Enter Marks: ")&&(!(cin>>record[n].date_registered)||record[n].date_registered<0)){
            cout<<"Invalid Input! Please Enter Marks"<<endl;
            cin.clear();
            cin.ignore(1000,'\n'); 
}

    og.write(reinterpret_cast<char *>( &rec), sizeof(STUREC)); 

    og.close();

}
      }
        

/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/   
      else if (choice == 1) // Save All Records to Text File
      {
           
      }
        
/*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/

    It doesnt Stat on the Assignment, about Stacks, but to keep me up to things im going add a Binary Search, and a Stack into the Program to see how it all plans out. could some one help me on the Alter and Adding to end of file please.


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