getline and extract char or integers

mata (1)
My problem is that I'm using getline(cin, line) but then I dont know how to extract the numbers in the commands that COULD have number for specifying the line index.
Start the program with cout >> "EDIT file", after which a prompt appears
along with the line number. If the letter I is entered with a number n following it, then insert the text to be followed before line n. If I is not followed by a number, then insert the text before the current line. If D is entered with two numbers n and m, one n, or no number following it, then
delete lines n through m, line n, or the current line. Do the same with the command L, which stands for listing lines. If A is entered, then append the text to the existing lines. Entry E signifies exit
and saving the text in a file. Here is an Example of how is should look de output:
EDIT testfile
1> The first line
2>
3> And another line
4>I 3
3> The second line
4> One more line
5> L
1> The first line
2>
3> The second line
4> One more line
5> And another line // This is now line 5, not 3;
5> D 2 // line 5, since L was issued from line 5;
4> L // line 4, since one line was deleted;
1> The first line
2> The second line // this and the following lines
3> One more line // now have new numbers
4> And another line
4> E


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#include "DLList.h"
#include <iostream>
#include <string>
#include<sstream>

using namespace std;

  int main()
{
	DLList<string> list;
	string line, word;
	stringstream ss;
	int index = 1, n, m;
	char c;



	cout << "EDIT textfile\n";
	cout << index << "> ";
	getline(cin, line);
	
	


	while (line.length() == 0 || line.at(0) != 'E')
	{
		ss << line;
		
		if (line.length() == 0)
		{
			list.addToIndx(index, line);
			index++;
		}
		else
		{
			switch (line.at(0))
			{
			case 'A':
				//Append to node
				cout << index << "> ";
				cin >> line;
				list.appendToIdx(index, line);
				break;
			case 'D':
				//delete Node
				if (line.size() == 5)
				{
					n = line.at(2) - 48;
					m = line.at(4) - 48;
					list.deleteRage(n, m);
					index = n - m + 1;
				}
				else if (line.size() == 3)
				{
					n = line.at(2) - 48;
					list.deleteRage(n, n);
					index--;
				}
				else
				{
					list.deleteRage(index, index);
					index--;
				}
				//index = index--;
				break;
			case 'I':
				//Inser node
				if (line.size() == 3)
				{
					n = line.at(2) - 48;
					index = n;
					cout << n << "> ";
				}
				else  {
					n = index--;
					cout << n << "> ";
				}
				
				getline(cin, line);
				list.addToIndx(n, line);
				
				break;
			case'L':
				//List or print nodes					
				if (line.size() == 5)
				{
					n = line.at(2) - 48;
					m = line.at(4) - 48;
					list.printList(n, m);
				}
				else if (line.size() == 3)
				{
					n = line.at(2) - 48;
					list.printList(n, n);
				}
				else
				{
					list.printList(index, index);
				}
				break;
			default:
				list.addToIndx(index, line);
				index++;
				break;
			}//switch end

		}//end else

		cout << index << "> ";
		getline(cin, line);
	}

	return 0;
}
Last edited on
TheToaster (628)
std::regex would be a good fit here:
http://www.cplusplus.com/reference/regex/

You might also have to read up on ECMAScript syntax in that above link as well if you aren't familiar with how to make a regular expression.
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