sino online na mgaling sa program. c++ ang inaaral ko ngayon. oa cgeck naman kung ano mali ko sa code kc ayaw mag run.
// A simple example of Student records ...
// using a C++ 'list' container to hold each 'Student' element
// 1. adds info from keyboard into a list of 'Student' records (using push_back)
// 2. shows the 'records' in memory on the screen
// 3. writes to file ... all the records in memory
// 4. reads from file and stores all the records in memory (in a C++ list)
// 5. allows edit/erase ... to a Student record
// 6. sorts Student records by student name ...
// 7. sorts Student records by student id number ...
// Note:
// * this program allows only unique student id's for each record
// * this program is set to update its file, (if there were any changes),
// before quitting
#include <fstream>
#include <iostream>
#include <string>
#include <list>
#include <cctype>
// Globals ...
using namespace std;
const char THIS_TERM[] = "fall.txt"; // file name for this term's records
const string HEADER = "\nWhat do you want to do ?\n\n"
"\t1. A dd a new student name and id ? \n"
"\t2. E dit/E rase a student record ? \n"
"\t3. S ort a student record ? \n"
"\t4. V iew all in memory at present ? \n"
"\t5. U pdate file with data currently in memory ? \n"
"\t6. L oad in data from file ? \n"
"\t7. e X it program ? ";
class Student
{
public:
// constructors ...
Student(){}
Student(string nam, string num ) { name=nam; id=num; }
// setters ...
void setName(string nam){ name = nam; }
void setID(string num) { id = num; }
// getters ...
string getName() { return name; }
string getID() { return id; }
private:
string name, // add any needed info here, just like in a C/C++ 'struct'
id;
};
// functions used by main to process a list of Student records
// returns a valid iterator if ID is used already ... otherwise returns NULL
list< Student >::iterator existID( list< Student >& term, string& ID )
{
list< Student >::iterator it;
for( it = term.begin(); it != term.end(); ++it )
{
if( it->getID() == ID )
return it;
}
return NULL;
}
// adds Student records to end of end of list of Student records ... 'term'
// gets input from keyboard ...
int newStud( list< Student >& term )
{
cout << "\nEnter an empty record to exit this 'Input Loop' ..." << endl;
int count = 0, reply;
string nam, num;
for( ;; ) // loop forever until break ...
{
cout << "\nID : ";
getline(cin, num);
if( existID( term, num ) != NULL )
{
cout << "\nThat 'id' " << num << " already exits ... " << endl;
continue; // from the top of the forever loop right now
}
cout << "Name : ";
getline(cin, nam);
if( nam=="" || num=="")
break;
cout << "Add or Redo (a/r) ? ";
reply=cin.get();
cin.sync();
if ( toupper(reply)!='A' )
{
cout << "Aborted ..." << endl;
continue;
}
// ok ... create and add this record to the end of the list ...
term.push_back( Student(nam, num) );
++count;
cout << "Added ..." << endl;
}
return count;
}
// shows (to console screen) all student records in list container ... 'term'
void viewStuds( list< Student >& term )
{
list< Student >::iterator it;
int i = 0;
for( it = term.begin(); it != term.end(); ++it )
{
cout << ++i << ".\n"
<< "Name : " << it->getName() << endl
<< "Number : " << it->getID() << endl;
}
}
// file all records in memory ... create/overwrite file with name 'THIS_TERM'
int fileStuds( list< Student >& term )
{
ofstream fout( THIS_TERM ); // recall 'THIS_TERM' is a Global variable
if ( !fout )
{
cout << "\nError attempting to open file ..." << endl;
return -1; // report error condition ...
}
// else ...
list< Student >::iterator it;
int i = 0;
for( it = term.begin(); it != term.end(); ++it )
{
fout << it->getName() << "," << it->getID() << endl;
++i;
}
fout.close();
if( i == (int)term.size() )
cout << "\nAll " << i << " records filed ok." << endl;
else
cout << "\nOnly " << i << " of " << term.size()
<< " records were written ..." << endl;
return i; // report success ... i.e. report count of records filed
}
// reads in all Student records from file 'THIS_TERM' ... if it exists
// returns -1 if no file exists; else returns the number of records read
int readStuds( list< Student >& term )
{
ifstream fin( THIS_TERM ); // recall THIS_TERM is a Global variable
if ( !fin )
{
cout << "Error attempting to open file ... "
<< "(Perhaps it dosen't exist yet?)" << endl;
return -1; // report error condition ...
}
// else ... check existing term.size() first before re-setting?
if( term.size() ) // i.e. if not == 0 ...
{
cout << "\nDo you want over-write the " << term.size()
<< " records in memory (y/n) ? " << flush;
int reply = toupper( cin.get() );
cin.sync();
if( reply != 'Y' )
{
cout << "Aborted ... " << flush;
return 0;
}
}
// else ... if reach here ...
list< Student >temp;
term = temp; // set term to null ...
string nam, num;
int i;
for( i=0; getline( fin, nam, ',' ); ++i ) //first get 1st string (up to ',')
{
getline( fin, num, '\n' ); // then get rest of line (up to '\n')
term.push_back( Student(nam, num) ); // construct and add new Student
}
fin.close();
return i; // report success? ... i.e. return the record count ...
}
// returns 'true' is a record was edited or erased; otherwise returns false
bool editStud( list< Student > &term )
{
cout << "\nEnter an empty record to exit this 'Edit/Erase Function' ..."
<< "\nEnter the ID of the student record to edit ? " << flush;
string idStr, nam;
getline( cin, idStr );
list< Student >::iterator i, index;
i = existID( term, idStr );
if( i == NULL )
{
cout << "This '" << idStr << "' does not exist." << endl;
return false;
}
// else ... show ... and ask if ok to edit ...
cout << "Name : " << i->getName() << endl
<< "Number : " << i->getID() << endl
<< "Ok to edit/erase (y/n) ? " << flush;
int reply = toupper( cin.get() );
cin.sync();
if( reply != 'Y' )
{
cout << "Aborted ... " << endl;
return false;
}
cout << "\nDo you want to erase this record (y/n) ? " << flush;
reply = toupper( cin.get() );
cin.sync();
if( reply == 'Y' )
{
term.erase( i );
cout << "Erased ..." << endl;
return true;
}
// else ...
cout << "\nNew ID : ";
getline(cin, idStr);
index = existID( term, idStr );
if( index != NULL && index!= i )
{
cout << "\nThat " << idStr << " already exits ... " << endl;
return false; // exit to menu now ...
}
cout << "New Name : ";
getline(cin, nam);
if( nam=="" || idStr=="")
return false;
cout << "Ok or Redo (o/r) ? ";
reply=cin.get();
cin.sync();
if( toupper(reply)!='O' ) // cap 'O' ... as in Ok
{
cout << "Aborted ..." << endl;
return false;
}
// ok ... do edit
i->setName( nam );
i->setID( idStr );
cout << "Edited ..." << endl;
return true;
}
// name comparison here is NOT case sensitive ...
bool compare_nocaseName(Student& first, Student& second)
{
unsigned int i=0;
while( i<first.getName().length() && i<second.getName().length() )
{
if( tolower(first.getName()) < tolower(second.getName()) ) return true;
else if( tolower(first.getName()) > tolower(second.getName()) ) return false;
++i;
}
if( first.getName().length() < second.getName().length() ) return true;
else return first.getID() < second.getID();;
}
bool compare_id(Student& first, Student& second)
{
return first.getID() < second.getID();
}
void pauseForEnter()
{
cout << "\nPress 'Enter' to continue ... " << flush;
cin.sync();
cin.get();
}
int main()
{
// create a 'fall list' to hold student names and ids for the 'Fall Term'
// also holds number of records, via 'fall.size()'
list <Student > fall;
// now get all records from file ... if it exists ?
int count = readStuds( fall );
if( count >= 0 )
cout << count << " student record(s) read into memory ..." << endl;
else
cout <<"(The file will be created when some student records exist.)"
<<endl;
bool changes = false; // set 'update file flag' to initial value ...
int reply;
for( ;; ) // loop forever ... until break ...
{
cout << HEADER;
reply = toupper(cin.get());
cin.sync(); // flush cin stream ...
if( reply == '1' || reply == 'A' )
{
int numStuds = newStud( fall );
cout << endl << numStuds << " student record(s) added ..."
<< " The total number of student records now is "
<< fall.size() << endl;
if( numStuds )
changes = true; // if >0 update bool variable changes
}
else if( reply == '2' || reply == 'E' )
{
if( editStud( fall ) )
changes = true;
}
else if( reply == '3' || reply == 'S' )
{
cout << "\nSort by id or name (i/n) ? " << flush;
reply = toupper( cin.get() );
cin.sync();
cout << "Now sorted in memory by ";
if( reply == 'I' )
{
fall.sort(compare_id);
cout << "id. ";
}
else
{
fall.sort(compare_nocaseName);
cout << "name. ";
}
cout << "Update file (y/n) ? " << flush;
reply = toupper( cin.get() );
cin.sync();
if( reply == 'Y' )
{
changes = true;
cout << "File to be updated ...\n";
}
}
else if( reply == '4' || reply == 'V' )
viewStuds( fall );
else if( reply == '5' || reply == 'U' )
{
if( !changes )
cout << "\nNo changes to file ..." << endl;
else
{
cout << "Are you sure you want to update the file (y/n) ? "
<< flush;
reply = toupper( cin.get() );
cin.sync();
if( reply == 'Y' )
{
if( fileStuds( fall ) != (int)fall.size() )
cout << "\nERROR! NOT all records were filed!" << endl;
else
{
changes = false;// update file flag ...
cout << "File write operation confirmed." << endl;
}
}
}
}
else if( reply == '6' || reply == 'L' )
{
int condition = readStuds( fall );
if( condition >= 0 )
cout << "\nThere were " << condition
<< " student records read into memory from file." << endl;
}
else if( reply == '7' || reply == 'X' )
{
if( changes ) // then ...
fileStuds( fall );
break; // and exit program ...
}
else
{
cout << "\nThis choice not implemented yet ... " << endl;
} // end of if( reply == ? ) switch structure ...
} // end of forever loop ...
// if you have a Win OS ... show structure of file
string tmpSee = " ";
tmpSee = "notepad" + tmpSee + THIS_TERM;
system( tmpSee.c_str() );
}
// A simple example of Student records ...
// using a C++ 'list' container to hold each 'Student' element
// 1. adds info from keyboard into a list of 'Student' records (using push_back)
// 2. shows the 'records' in memory on the screen
// 3. writes to file ... all the records in memory
// 4. reads from file and stores all the records in memory (in a C++ list)
// 5. allows edit/erase ... to a Student record
// 6. sorts Student records by student name ...
// 7. sorts Student records by student id number ...
// Note:
// * this program allows only unique student id's for each record
// * this program is set to update its file, (if there were any changes),
// before quitting
#include <fstream>
#include <iostream>
#include <string>
#include <list>
#include <cctype>
// Globals ...
using namespace std;
const char THIS_TERM[] = "fall.txt"; // file name for this term's records
const string HEADER = "\nWhat do you want to do ?\n\n"
"\t1. A dd a new student name and id ? \n"
"\t2. E dit/E rase a student record ? \n"
"\t3. S ort a student record ? \n"
"\t4. V iew all in memory at present ? \n"
"\t5. U pdate file with data currently in memory ? \n"
"\t6. L oad in data from file ? \n"
"\t7. e X it program ? ";
class Student
{
public:
// constructors ...
Student(){}
Student(string nam, string num ) { name=nam; id=num; }
// setters ...
void setName(string nam){ name = nam; }
void setID(string num) { id = num; }
// getters ...
string getName() { return name; }
string getID() { return id; }
private:
string name, // add any needed info here, just like in a C/C++ 'struct'
id;
};
// functions used by main to process a list of Student records
// returns a valid iterator if ID is used already ... otherwise returns NULL
list< Student >::iterator existID( list< Student >& term, string& ID )
{
list< Student >::iterator it;
for( it = term.begin(); it != term.end(); ++it )
{
if( it->getID() == ID )
return it;
}
return NULL;
}
// adds Student records to end of end of list of Student records ... 'term'
// gets input from keyboard ...
int newStud( list< Student >& term )
{
cout << "\nEnter an empty record to exit this 'Input Loop' ..." << endl;
int count = 0, reply;
string nam, num;
for( ;; ) // loop forever until break ...
{
cout << "\nID : ";
getline(cin, num);
if( existID( term, num ) != NULL )
{
cout << "\nThat 'id' " << num << " already exits ... " << endl;
continue; // from the top of the forever loop right now
}
cout << "Name : ";
getline(cin, nam);
if( nam=="" || num=="")
break;
cout << "Add or Redo (a/r) ? ";
reply=cin.get();
cin.sync();
if ( toupper(reply)!='A' )
{
cout << "Aborted ..." << endl;
continue;
}
// ok ... create and add this record to the end of the list ...
term.push_back( Student(nam, num) );
++count;
cout << "Added ..." << endl;
}
return count;
}
// shows (to console screen) all student records in list container ... 'term'
void viewStuds( list< Student >& term )
{
list< Student >::iterator it;
int i = 0;
for( it = term.begin(); it != term.end(); ++it )
{
cout << ++i << ".\n"
<< "Name : " << it->getName() << endl
<< "Number : " << it->getID() << endl;
}
}
// file all records in memory ... create/overwrite file with name 'THIS_TERM'
int fileStuds( list< Student >& term )
{
ofstream fout( THIS_TERM ); // recall 'THIS_TERM' is a Global variable
if ( !fout )
{
cout << "\nError attempting to open file ..." << endl;
return -1; // report error condition ...
}
// else ...
list< Student >::iterator it;
int i = 0;
for( it = term.begin(); it != term.end(); ++it )
{
fout << it->getName() << "," << it->getID() << endl;
++i;
}
fout.close();
if( i == (int)term.size() )
cout << "\nAll " << i << " records filed ok." << endl;
else
cout << "\nOnly " << i << " of " << term.size()
<< " records were written ..." << endl;
return i; // report success ... i.e. report count of records filed
}
// reads in all Student records from file 'THIS_TERM' ... if it exists
// returns -1 if no file exists; else returns the number of records read
int readStuds( list< Student >& term )
{
ifstream fin( THIS_TERM ); // recall THIS_TERM is a Global variable
if ( !fin )
{
cout << "Error attempting to open file ... "
<< "(Perhaps it dosen't exist yet?)" << endl;
return -1; // report error condition ...
}
// else ... check existing term.size() first before re-setting?
if( term.size() ) // i.e. if not == 0 ...
{
cout << "\nDo you want over-write the " << term.size()
<< " records in memory (y/n) ? " << flush;
int reply = toupper( cin.get() );
cin.sync();
if( reply != 'Y' )
{
cout << "Aborted ... " << flush;
return 0;
}
}
// else ... if reach here ...
list< Student >temp;
term = temp; // set term to null ...
string nam, num;
int i;
for( i=0; getline( fin, nam, ',' ); ++i ) //first get 1st string (up to ',')
{
getline( fin, num, '\n' ); // then get rest of line (up to '\n')
term.push_back( Student(nam, num) ); // construct and add new Student
}
fin.close();
return i; // report success? ... i.e. return the record count ...
}
// returns 'true' is a record was edited or erased; otherwise returns false
bool editStud( list< Student > &term )
{
cout << "\nEnter an empty record to exit this 'Edit/Erase Function' ..."
<< "\nEnter the ID of the student record to edit ? " << flush;
string idStr, nam;
getline( cin, idStr );
list< Student >::iterator i, index;
i = existID( term, idStr );
if( i == NULL )
{
cout << "This '" << idStr << "' does not exist." << endl;
return false;
}
// else ... show ... and ask if ok to edit ...
cout << "Name : " << i->getName() << endl
<< "Number : " << i->getID() << endl
<< "Ok to edit/erase (y/n) ? " << flush;
int reply = toupper( cin.get() );
cin.sync();
if( reply != 'Y' )
{
cout << "Aborted ... " << endl;
return false;
}
cout << "\nDo you want to erase this record (y/n) ? " << flush;
reply = toupper( cin.get() );
cin.sync();
if( reply == 'Y' )
{
term.erase( i );
cout << "Erased ..." << endl;
return true;
}
// else ...
cout << "\nNew ID : ";
getline(cin, idStr);
index = existID( term, idStr );
if( index != NULL && index!= i )
{
cout << "\nThat " << idStr << " already exits ... " << endl;
return false; // exit to menu now ...
}
cout << "New Name : ";
getline(cin, nam);
if( nam=="" || idStr=="")
return false;
cout << "Ok or Redo (o/r) ? ";
reply=cin.get();
cin.sync();
if( toupper(reply)!='O' ) // cap 'O' ... as in Ok
{
cout << "Aborted ..." << endl;
return false;
}
// ok ... do edit
i->setName( nam );
i->setID( idStr );
cout << "Edited ..." << endl;
return true;
}
// name comparison here is NOT case sensitive ...
bool compare_nocaseName(Student& first, Student& second)
{
unsigned int i=0;
while( i<first.getName().length() && i<second.getName().length() )
{
if( tolower(first.getName()) < tolower(second.getName()) ) return true;
else if( tolower(first.getName()) > tolower(second.getName()) ) return false;
++i;
}
if( first.getName().length() < second.getName().length() ) return true;
else return first.getID() < second.getID();;
}
bool compare_id(Student& first, Student& second)
{
return first.getID() < second.getID();
}
void pauseForEnter()
{
cout << "\nPress 'Enter' to continue ... " << flush;
cin.sync();
cin.get();
}
int main()
{
// create a 'fall list' to hold student names and ids for the 'Fall Term'
// also holds number of records, via 'fall.size()'
list <Student > fall;
// now get all records from file ... if it exists ?
int count = readStuds( fall );
if( count >= 0 )
cout << count << " student record(s) read into memory ..." << endl;
else
cout <<"(The file will be created when some student records exist.)"
<<endl;
bool changes = false; // set 'update file flag' to initial value ...
int reply;
for( ;; ) // loop forever ... until break ...
{
cout << HEADER;
reply = toupper(cin.get());
cin.sync(); // flush cin stream ...
if( reply == '1' || reply == 'A' )
{
int numStuds = newStud( fall );
cout << endl << numStuds << " student record(s) added ..."
<< " The total number of student records now is "
<< fall.size() << endl;
if( numStuds )
changes = true; // if >0 update bool variable changes
}
else if( reply == '2' || reply == 'E' )
{
if( editStud( fall ) )
changes = true;
}
else if( reply == '3' || reply == 'S' )
{
cout << "\nSort by id or name (i/n) ? " << flush;
reply = toupper( cin.get() );
cin.sync();
cout << "Now sorted in memory by ";
if( reply == 'I' )
{
fall.sort(compare_id);
cout << "id. ";
}
else
{
fall.sort(compare_nocaseName);
cout << "name. ";
}
cout << "Update file (y/n) ? " << flush;
reply = toupper( cin.get() );
cin.sync();
if( reply == 'Y' )
{
changes = true;
cout << "File to be updated ...\n";
}
}
else if( reply == '4' || reply == 'V' )
viewStuds( fall );
else if( reply == '5' || reply == 'U' )
{
if( !changes )
cout << "\nNo changes to file ..." << endl;
else
{
cout << "Are you sure you want to update the file (y/n) ? "
<< flush;
reply = toupper( cin.get() );
cin.sync();
if( reply == 'Y' )
{
if( fileStuds( fall ) != (int)fall.size() )
cout << "\nERROR! NOT all records were filed!" << endl;
else
{
changes = false;// update file flag ...
cout << "File write operation confirmed." << endl;
}
}
}
}
else if( reply == '6' || reply == 'L' )
{
int condition = readStuds( fall );
if( condition >= 0 )
cout << "\nThere were " << condition
<< " student records read into memory from file." << endl;
}
else if( reply == '7' || reply == 'X' )
{
if( changes ) // then ...
fileStuds( fall );
break; // and exit program ...
}
else
{
cout << "\nThis choice not implemented yet ... " << endl;
} // end of if( reply == ? ) switch structure ...
} // end of forever loop ...
// if you have a Win OS ... show structure of file
string tmpSee = " ";
tmpSee = "notepad" + tmpSee + THIS_TERM;
system( tmpSee.c_str() );
}
