why is it skipping lines?

[CyberShot]

I have a function called addChecksum that is called from a switch statement. The function is to ask for a file path to a file, then to open the file. But if it doesn't open, then it should take you back to the menu. Right now, it runs through the entire function without giving me a chance to enter the file path. I don't understand why. Here is my code

#include "stdafx.h"
#include <string>
#include <iostream>
#include <iomanip>
#include <cmath>
#include <fstream>
using namespace std;

void selection();
void addChecksum();
void runChecksum();

int main()
{
	selection();
	
    system("pause");
    return 0;
}

void selection()
{
	char choice;

	cout << "Please Select: " << endl;
	cout << "  A) Add checksum to specified file" << endl;
	cout << "  B) Verify integrity of specified file" << endl;
	cout << "  Q) Quit" << endl;

	cin >> choice;
	cout << endl;

	switch (choice)
	{
	case 'A': 
		addChecksum();
		break;
	case 'a':
		addChecksum();
		break;
	case 'B':
		runChecksum();
		break;
	case 'b':
		runChecksum();
		break;
	case 'Q':
		return;
	case 'q':
		return;

	default:
		cout << "Your choice did not match any of the menu options." << endl;
	}
}

void addChecksum()
{
	string inputFileName;
	ifstream inputFile;
	string line;

	cout << "Specify the file path: ";
	getline(cin, inputFileName);

	inputFile.open(inputFileName.c_str());
	cout << endl;

	while(!inputFile.is_open())
	{
		cout << "The file " << inputFileName << "could not be found or opened!" << endl;
		selection();
	}
}

void runChecksum()
{
	string inputFileName;
	ifstream inputFile;
	string line;
	int checksum;

	checksum = 0;

	while(!inputFile.is_open())
	{
		cout << "Specify the file path: " << inputFileName;
		getline(cin, inputFileName);

		inputFile.open(inputFileName.c_str());
	}

	cout << "File checksum = " << checksum << endl;
}