need help finishing code for addressbook....

[ting]

Hi. I need help finishing this code. I had this code posted weeks ago. But I noticed a couple of things i was doing wrong. I tried to fix them. Also I have some comments in the code saying what each line is supposed to do. I'm asking of anyone can tell me how to write those lines. I seem to not know what I'm doing and I'm begging for someone's help.
My code is supposed to be able to add entries to a file and display them. The user can enter as many entries as desired by repeatedly selecting option 1 on the menu. If a user wishes to see the entries in the address book, choose option 2. The display should display each entry at a time, example:
SMITH, JANE
20 PARK AVE
NEW YORK, NY
212-342-1122

PRESS ANY KEY FOR THE NEXT ENTRY

When a key is pressed after the last record in the file is displayed,
the following screen should appear:

ALL ENTRIES HAVE BEEN DISPLAYED.
PRESS ANY KEY TO CONTINUE
Pressing any key will return to the menu.

Also the I need all entries to be converted to uppercase before saving them to a file. The display should display everything in caps.
Also, The last name and first name should be converted to the single form: LAST, FIRST. The resulting record should be written to the file with '#' characters separating the fields and <eol> (end of line - endl or '\n') after the telephone number. For example:
SMITH, JANE#20 PARK AVE#NEW YORK, NY###212-342-1122<eol><eof>
Note that if lines of address are missing (i.e. the field consists
of the empty string; notice the three consecutive # characters for
the entry above) then they should not be displayed between the last
address line that is not empty and the telephone number.
So the display should look like:
SMITH, JANE
20 PARK AVE
NEW YORK, NY
212-342-1122
I don't know how to do that part.
Can anyone help me out please, asap!!!
thank you and here is my code:

const char FILENAME[80] = "C:\\MS Visual C++\\Programs\\AddressBook.dat";

struct addresstype
{
	char lastname[21];
	 char firstname[21];
	 char line1[31], line2[31], line3[31], line4[31];
	 char phone[14];
};

int menu();
void add_to_address_book(struct addresstype &);
void output_info(struct addresstype &, ofstream &);
void input_info(struct addresstype &);
void display_address_book(struct addresstype);

void main()
{
	struct addresstype addin;
	int choice=0;
	ifstream infile;
	ofstream outfile;

	infile.open(FILENAME, ios::app);
	if(infile.fail())
	{
		cout<<endl;
		cout<<FILENAME<<&quot; could not be opened for output.&quot;<<endl;
		cout<<&quot;The file might be corrupted.&quot;<<endl;
		exit(1);
	}
	else
	{
		while(choice!=3)
		{
			choice=menu();
			switch(choice)
			{
			case 1: add_to_address_book(addin);
				input_info(addin);
				break;
				
			case 2:
				output_info(addin, outfile);
				display_address_book(addin);
				break;
			}
			if(choice > 3)
			{
				system(&quot;cls&quot;);
				cout<<&quot;\t\t&quot; << &quot;INVALID ENTRY\n\n\n&quot;;
			}  			
		}
	}
}

int menu()
{    
	int choice = 0;
	cout<<endl<<endl;
	cout<<&quot;\t\t&quot; << &quot;WHAT DO YOU WANT TO DO?\n\n\n&quot;; 
	cout<<&quot;\t\t&quot; << &quot;1. ADD AN ENTRY\n&quot;;
	cout<<&quot;\t\t&quot; << &quot;2. DISPLAY ENTRIES\n&quot;;
	cout<<&quot;\t\t&quot; << &quot;3. EXIT\n&quot;;
	cout<<&quot;\n\n\n&quot;;
	cout<<&quot;\t\t&quot; << &quot;ENTER YOUR CHOICE (1, 2 or 3):  &quot;;
	cin>>choice;
	cout<<&quot;\n&quot;;
	return choice;
}

void add_to_address_book(addresstype& addin)
{
	system(&quot;cls&quot;);
	cout<<&quot;\n\n&quot;<<&quot;\t\tEnter the items requested.\n&quot;;
	cout<<&quot;\t\tFour lines are provided for the address.\n&quot;;
	cout<<&quot;\t\tPress <ENTER> if an address line is not needed.\n\n&quot;;
	cout<<&quot;\n\n\n&quot;;

	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;LAST NAME: &quot;;
	cin.get(addin.lastname, 21, '\n');
 
	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;FIRST NAME: &quot;;
	cin.get(addin.firstname, 21, '\n');
 
	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;ADDRESS LINE 1: &quot;;
	cin.get(addin.line1, 31, '\n');

	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;ADDRESS LINE 2: &quot;;
	cin.get(addin.line2, 31, '\n');

	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;ADDRESS LINE 3: &quot;;
	cin.get(addin.line3, 31, '\n');

	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;ADDRESS LINE 4: &quot;;
	cin.get(addin.line4, 31, '\n');

	cin.ignore(100, '\n');
	cout<<&quot;\t\t&quot; << &quot;TELEPHONE NUMBER: &quot;;
	cin.get(addin.phone, 14, '\n');
	cin.ignore(100, '\n');    
	system(&quot;cls&quot;);
}

void input_info(addresstype &addin)
{
	ifstream infile;
	infile.open(FILENAME, ios::in);
	if(infile.fail())
	{
		cout<<&quot;\n&quot;;
		cout<<FILENAME<<&quot; could not be opened for writing into.\n&quot;;
		cout<<&quot;The file might be corrupted.\n&quot;;
		exit(1);
	}
	/*char toupper(addin.lastname[21]); should this be here? And how 
do I change all the cases to upper case
	[21] is probably only changing the 20th element*/
	while(!infile.eof())
	{
	infile >> addin.lastname;
	infile.ignore(1);
	infile >> addin.firstname;
	infile.ignore(1);	
	infile >> addin.line1;
	infile.ignore(1);
	infile >> addin.line2;
	infile.ignore(1);
	infile >> addin.line3;
	infile.ignore(1);
	infile >> addin.line3;
	infile.ignore(1);
	infile >> addin.phone;
	infile.ignore(100, '\n');
	}
infile.close();
}

void output_info(addresstype& addin, ofstream& outfile)
{
	outfile<<addin.lastname << &quot;#&quot;
		   <<addin.firstname << &quot;#&quot;
		   <<addin.line1 << &quot;#&quot;
		   <<addin.line2 << &quot;#&quot;
		   <<addin.line3 << &quot;#&quot;
		   <<addin.line4 << &quot;#&quot;
		   <<addin.phone << &quot;\n&quot;;
}

void display_address_book(addresstype addin)
{

	system(&quot;cls&quot;);
	cout<<&quot;All the entries are:\n&quot;;

	//while(///) //don't know what to put in this loop
	cout<<addin.lastname<<&quot;, &quot;<<addin.firstname<<&quot;\n&quot;
        <<addin.line1<<&quot;\n&quot;
        <<addin.line2<<&quot;\n&quot;
        <<addin.line3<<&quot;\n&quot;
        <<addin.line4<<&quot;\n&quot;
        <<addin.phone<<&quot;\n&quot;
        <<&quot;\n&quot;;     
	//or maybe I can have an if statement
	if(addin.lastname[21] < '1') //don't know what to write for the if statement
	{
		//have a while loop here
		cout<<&quot;PRESS ANY KEY FOR THE NEXT ENTRY&quot;<<endl;
		cin.get();
		//close while loop
		cout<<&quot;ALL ENTRIES HAVE BEEN DISPLAYED.&quot;<<endl;
		cout<<&quot;PRESS ANY KEY TO CONTINUE.&quot;<<endl;
		cin.get();
	}
}