DaniWeb Forum Index > Software Development > C++

C++ RSS

pair

Please support our C++ advertiser: Intel Parallel Studio Home

Thread Solved

•

Join Date: Nov 2007

Posts: 219

Reputation: nurulshidanoni is an unknown quantity at this point

Solved Threads: 0

nurulshidanoni nurulshidanoni is offline

Offline

Posting Whiz in Training

pair

Mar 4th, 2008

How to make a pair programming..

like I have 1 2 3 4 5 6 7
First, I want to make a pair of 91,20
(1,3)
(1,4)
(1,5)

using i=1, i<9,i++

•

Join Date: Nov 2007

Posts: 219

Reputation: nurulshidanoni is an unknown quantity at this point

Solved Threads: 0

nurulshidanoni nurulshidanoni is offline

Offline

Posting Whiz in Training

Re: pair

Mar 4th, 2008

I want to do like this, but how to call from i=0, i<11; i++, and how o insert in this program.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
 
#include <iostream.h>
 
template<class C> 
class Pair
{
public:
	Pair(C, C);
	Pair(Pair&);
	void Display();
 
private:
	C first;
	C second;
};
 
template<class C> 
Pair<C>::Pair(C left, C right)
{
	first = left;
	second = right;
}
 
 
template<class C> 
Pair<C>::Pair(Pair<C>& p)
{
	first = p.first;
	second = p.second;
}
 
template<class C> 
void Pair<C>::Display()
{
	cout<<"(" << first <<","<< second <<")"<<"\n";
}
 
int main()
{
	Pair<int> pi(2,3);
 
	pi.Display();
 
	return 0;
}
#include <iostream.h>

template<class C> 
class Pair
{
public:
	Pair(C, C);
	Pair(Pair&);
	void Display();

private:
	C first;
	C second;
};

template<class C> 
Pair<C>::Pair(C left, C right)
{
	first = left;
	second = right;
}


template<class C> 
Pair<C>::Pair(Pair<C>& p)
{
	first = p.first;
	second = p.second;
}

template<class C> 
void Pair<C>::Display()
{
	cout<<"(" << first <<","<< second <<")"<<"\n";
}

int main()
{
	Pair<int> pi(2,3);

	pi.Display();

	return 0;
}

•

Join Date: Mar 2008

Posts: 62

Reputation: Joatmon is an unknown quantity at this point

Solved Threads: 7

Joatmon

Offline

Junior Poster in Training

Re: pair

Mar 4th, 2008

Well since you want to do it in a for loop, you must realize that this is probably a job for pointers since you can't make a for loop generate names for your variables to hold the class. What I would do is this:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
int main()
{
    const int SIZE = 8;
    Pair<int> * pairs[SIZE]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < SIZE; i++)
        pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array
 
	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	return 0;
}
int main()
{
    const int SIZE = 8;
    Pair<int> * pairs[SIZE]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < SIZE; i++)
        pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	return 0;
}

•

Join Date: Nov 2007

Posts: 219

Reputation: nurulshidanoni is an unknown quantity at this point

Solved Threads: 0

nurulshidanoni nurulshidanoni is offline

Offline

Posting Whiz in Training

Re: pair

Mar 4th, 2008

I dont understand

•

Join Date: Mar 2008

Posts: 62

Reputation: Joatmon is an unknown quantity at this point

Solved Threads: 7

Joatmon

Offline

Junior Poster in Training

Re: pair

Mar 4th, 2008

If you do not understand what pointers are or how they work, it would not be fitting to describe every aspect of them in this thread.

I will however give you a good tutorial on pointers, and when you practice with their examples, you should have a decent grasp of them, then you may come back to the example I gave previously and it should seem more clear.

http://www.cplusplus.com/doc/tutorial/pointers.html

•

Join Date: Nov 2007

Posts: 219

Reputation: nurulshidanoni is an unknown quantity at this point

Solved Threads: 0

nurulshidanoni nurulshidanoni is offline

Offline

Posting Whiz in Training

Re: pair

Mar 4th, 2008

I understand now, but a lot of error.

error C2065: 'pairs' : undeclared identifier
error C2109: subscript requires array or pointer type
error C2061: syntax error : identifier 'Pair'
error C2109: subscript requires array or pointer type
error C2227: left of '->Display' must point to class/struct/union
error C2143: syntax error : missing ';' before '}'
error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\ashida\My Documents\MASTER C++\main\78.cpp(22) : fatal error C1003: error count exceeds 100; stopping compilation
Error executing cl.exe.

78.exe - 102 error(s), 0 warning(s)

•

Join Date: Mar 2008

Posts: 62

Reputation: Joatmon is an unknown quantity at this point

Solved Threads: 7

Joatmon

Offline

Junior Poster in Training

Re: pair

Mar 4th, 2008

Can you post your source now please? (and edit out the big error list, it is mostly the same error over and over again and is just a big waste of space)

I will see what you have and try to help you out.

•

Join Date: Nov 2007

Posts: 219

Reputation: nurulshidanoni is an unknown quantity at this point

Solved Threads: 0

nurulshidanoni nurulshidanoni is offline

Offline

Posting Whiz in Training

Re: pair

Mar 4th, 2008

Here it is..

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream>
usingnamespace std;
{
    const int students.size = 12;
    Pair<int> * pairs[students.size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < students.size; i++)
    pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array
 
	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
 
	return 0;
	}
#include <iostream>
usingnamespace std;
{
    const int students.size = 12;
    Pair<int> * pairs[students.size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < students.size; i++)
    pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	
	return 0;
	}

•

Join Date: Mar 2008

Posts: 62

Reputation: Joatmon is an unknown quantity at this point

Solved Threads: 7

Joatmon

Offline

Junior Poster in Training

Re: pair

Mar 4th, 2008

1.
Did you make sure you kept what you had in front of main? I remove that from the code i posted as it is the same as you had, only the things in main were what i changed.

2.
students.size is referring to a data member of an object that doesn't exist. Moreover, since it would be a data member inside an object, it couldn't be declared again. Use a plain variable name instead of students.size. maybe students_size

•

Join Date: Nov 2007

Posts: 219

Reputation: nurulshidanoni is an unknown quantity at this point

Solved Threads: 0

nurulshidanoni nurulshidanoni is offline

Offline

Posting Whiz in Training

Re: pair

#10

Mar 4th, 2008

This is a full code. but error.fatal error C1003: error count exceeds 100; stopping compilation
Error executing cl.exe.

is it cannot exceed 100?

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
/*------------------------------------------------------------------------------------------+
|                           Filename : ConflictMatrix.cpp                                   |
+------------------------------------------------------------------------------------------*/
 
#include <iostream>  // std::cout
#include <fstream>
#include <iomanip>
#include <string>    // std::string
#include <vector>    // std::vector<>
#include <algorithm> //std::for each()
using namespace std; // import "std" namespace into global namespace
 
 
   struct student
{
   string studentid;
   vector <int> examcode;   
};
		int main()
	{
		ifstream stream1 ("STA83STU.txt");
		if ( !stream1 )
		{
			cout << "While opening a file an error is encountered" << endl;
		}
			else
			{
			cout << "File is successfully opened" << endl;
			}  
 
				vector <student> students;
				student aStudent;
				string tempStudentID;
				bool readEntireFile = false;     // set to true when reach end of file
 
			    stream1 >> tempStudentID;    //  read in student id of first student
				while ( !readEntireFile )
 
				{
 
					aStudent.studentid = tempStudentID;  //  new student
					int tempExamCode;
					aStudent.examcode.clear ();
					stream1 >> tempExamCode;    // read in first exam code for this student
					aStudent.examcode.push_back (tempExamCode);  // add this exam code to current student's vector of exam codes
					bool newStudent = false;   // true when a new student id is encountered
					while ( !newStudent && !readEntireFile )
 
					{
 
					if ( stream1 >> tempStudentID )   // successfully read in student id
 
						{
						if ( tempStudentID.compare (aStudent.studentid) == 0 )  // student id is same as before
 
							{
							stream1 >> tempExamCode;   // read in exam code
							aStudent.examcode.push_back (tempExamCode); // add this exam code to this student;s vector of exam codes
							}
 
						else
						newStudent = true;   // student id is different from before.  Therefore new student.
						}
 
					else
					readEntireFile = true;  // end of file reached.  Want to exit inner and outer while loops
					}  // if new student, do not repeat this while loop
 
					students.push_back (aStudent);   // no more exam codes for this student.  Add aStudent to students vector
				}
 
				stream1.close ();  // We have read the entire file, so time to close it.
 
				for ( int i = 0 ; i < students.size (); i++ )
					{
					cout <<i<<":\t" ;   // output student id
					for ( int j = 0;j<students.at(i).examcode.size(); j++ )
					cout << students.at (i).examcode.at(j) <<"\t";   // output list of exam codes for this student
					cout<<""<<"\n";       
					} 
/*--------------------------------------------------------------------------------------------+
|                         counting elements in StudentID                                     |
+--------------------------------------------------------------------------------------------*/
 
	{
    const int student_size = 12;
    Pair<int> * pairs[student_size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < student_size; i++)
    pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array
 
	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
 
	return 0;
	}
/*-------------------------------------------------------------------------------------------+		
|                                         Matrix ExamID                                       
+--------------------------------------------------------------------------------------------*/
   {
cout<<"i,j|";
for (int colHead = 1; colHead < 11; colHead++)
cout << setw(3) << colHead;
cout << endl;
cout <<"__________________________________"<<endl;
 
			for (int rowVal = 1; rowVal < 11; rowVal++)
		{
			cout << setw(3)<< rowVal <<'|';
 
			for (int colVal =1; colVal < 11; colVal++)
			cout << setw(3)<<"x";
			cout <<endl;
		}
	} 
}
/*------------------------------------------------------------------------------------------+
|                           Filename : ConflictMatrix.cpp                                   |
+------------------------------------------------------------------------------------------*/

#include <iostream>  // std::cout
#include <fstream>
#include <iomanip>
#include <string>    // std::string
#include <vector>    // std::vector<>
#include <algorithm> //std::for each()
using namespace std; // import "std" namespace into global namespace


   struct student
{
   string studentid;
   vector <int> examcode;   
};
		int main()
	{
		ifstream stream1 ("STA83STU.txt");
		if ( !stream1 )
		{
			cout << "While opening a file an error is encountered" << endl;
		}
			else
			{
			cout << "File is successfully opened" << endl;
			}  
			
				vector <student> students;
				student aStudent;
				string tempStudentID;
				bool readEntireFile = false;     // set to true when reach end of file

			    stream1 >> tempStudentID;    //  read in student id of first student
				while ( !readEntireFile )
		
				{

					aStudent.studentid = tempStudentID;  //  new student
					int tempExamCode;
					aStudent.examcode.clear ();
					stream1 >> tempExamCode;    // read in first exam code for this student
					aStudent.examcode.push_back (tempExamCode);  // add this exam code to current student's vector of exam codes
					bool newStudent = false;   // true when a new student id is encountered
					while ( !newStudent && !readEntireFile )
			
					{
		
					if ( stream1 >> tempStudentID )   // successfully read in student id
			
						{
						if ( tempStudentID.compare (aStudent.studentid) == 0 )  // student id is same as before
					
							{
							stream1 >> tempExamCode;   // read in exam code
							aStudent.examcode.push_back (tempExamCode); // add this exam code to this student;s vector of exam codes
							}
				
						else
						newStudent = true;   // student id is different from before.  Therefore new student.
						}
				
					else
					readEntireFile = true;  // end of file reached.  Want to exit inner and outer while loops
					}  // if new student, do not repeat this while loop
		
					students.push_back (aStudent);   // no more exam codes for this student.  Add aStudent to students vector
				}
	
				stream1.close ();  // We have read the entire file, so time to close it.

				for ( int i = 0 ; i < students.size (); i++ )
					{
					cout <<i<<":\t" ;   // output student id
					for ( int j = 0;j<students.at(i).examcode.size(); j++ )
					cout << students.at (i).examcode.at(j) <<"\t";   // output list of exam codes for this student
					cout<<""<<"\n";       
					} 
/*--------------------------------------------------------------------------------------------+
|                         counting elements in StudentID                                     |
+--------------------------------------------------------------------------------------------*/
  
	{
    const int student_size = 12;
    Pair<int> * pairs[student_size]; // Declare an array of pointers to Pair<int>
    for (int i = 0; i < student_size; i++)
    pairs[i] = new Pair<int>(1,i); // Construct each new pair and give its address to an index in the pointer array

	pairs[3]->Display(); //since Display is a member function of an object, and pairs[num] is a pointer to that object, you use the arrow operator to dereference and call the member function
	
	return 0;
	}
/*-------------------------------------------------------------------------------------------+		
|                                         Matrix ExamID                                       
+--------------------------------------------------------------------------------------------*/
   {
cout<<"i,j|";
for (int colHead = 1; colHead < 11; colHead++)
cout << setw(3) << colHead;
cout << endl;
cout <<"__________________________________"<<endl;

			for (int rowVal = 1; rowVal < 11; rowVal++)
		{
			cout << setw(3)<< rowVal <<'|';

			for (int colVal =1; colVal < 11; colVal++)
			cout << setw(3)<<"x";
			cout <<endl;
		}
	} 
}