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  #1  
Old May 14th, 2005, 10:13 PM
Aydun Aydun is offline
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Question Help w/ some code

Greetings, I keep looking.. but I cannot figure out why this isn't working..

Code:
// Game titles
  // CH4 exercise (using vectors and iterators)
  // The purpose of this program is to allow the user
  // the ability to create a list of their game titles,
  // by adding elements to a vector, and removing them.
  
  #include <iostream>
  #include <vector>
  #include <string>
  #include <algorithm>
  
  using namespace std;
  
  int main()
  {
  	vector<string> titles;		// Vector for titles
 	vector<string>::iterator eVal;		// Iterator used to edit data
  	vector<string>::const_iterator dVal;  // Iterator used to view data
  	
  	while (true)
  	{
 		int choice = 0;			 // Menu options selector
 		char option;			 // Return to Menu option
  		
  		 cout << "\t\t\nWelcome to the Game titles Main Menu\n";
  		 cout << "Please select your option.\n";
  		 cout << "\t1 - View titles\n";
  		 cout << "\t2 - Add a title\n";
  		 cout << "\t3 - Remove a title\n";
  		 cout << "\t4 - Exit\n";
  		 cout << "Choice: ";
  		   cin  >> choice;
  	 
  		if (choice == 1)
  		   {
 			 cout << "\nYou have " << titles.size() << " games:\n";
 			 for (dVal = titles.begin(); dVal != titles.end(); ++dVal)
 				 cout << *dVal << endl;
  			continue;
  		 }	
  		 
  		 while (choice == 2)
  		 {
 			 string input;		 	// Title input
  			 cout << "\nEnter the title to add: ";
  			 getline(cin, input, '\n');
  			 titles.insert(titles.begin(), input);
 			 for (dVal = titles.begin(); dVal != titles.end(); ++dVal)
 				 cout << *dVal << endl;
  			   cout << "Enter another title? [y,n]: ";
  			   cin  >> option;
  			   if (option == 'y')
  				   continue;
  			else
  				break;
  		  }   
  	}
  }
  				 
  	
  	


this is obviously unfinished but the purpose so far is to be able to enter a title, and display the content of the vector.. I can only use vectors for this assignment, so please don't tell me to use linked lists !

What happens is that when i enter 2 as the option, it displays "enter the game title" then jumps right to the "Enter another title" blurb.. my friend told me about getline, so i'm not sure if i'm using it properly .. because i don't even get input as a user.. it just skips it.

Thanks for any insight into the problem .. (i get no compile errors/ warnings.. so i guess it's a logical error.)

Thank you,
Alan

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  #2  
Old May 17th, 2005, 06:48 PM
ubergeek ubergeek is offline
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fixed. Very common problem; fix is one line. Simply add, anywhere between
Code:
 cin >> choice;
 

and the call to getline, this line of code:
Code:
 cin.ignore(); //flushes the input buffer
 

This "flushes" the input buffer. Input is "buffered," meaning stored in a string somewhere, until the user presses Enter. That enter is stored in the input buffer, but not given to your application when you use cin>>. So the next time you use getline(), there is a \n already waiting in the input buffer. Therefore, the program uses "" as the input and doesn't ask for any user input. Flushing the buffer removes everything that was there, so getline detects an empty buffer and waits for user input.

Btw, you don't have to call cin.ignore() after using getline() because getline will remove the delimiter (\n in this case) from the buffer.

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