Reading in file wrong output

Everything is working fine, except when I put in an empty file, it gives me a max and min of -858993460. I need it to return a value of 1.
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#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int processFile(ifstream& ifile, long i, long& retIthVal, long& minimum, long& maximum);

int main()
{
	long i,
		retIthVal,
		minimum,
		maximum;
	int returnvalue=1;

	ifstream ifile;		//variable for myfile
	string strVar;		//variable for textfile

	cout << "Input File Name: ";		//prompts for user file
	cin >> strVar;						//inputs textfile into string

	ifile.open(strVar.c_str());
	if (!ifile)	// the ! means myInfile is non 0, indicating it is OK
	{
		cout << "\nThat file does not exist!\n";	//shows this if file is wrong
		return 1;
	}
	cout << "Which number do you want to return? ";
	cin >> i;
	returnvalue=processFile(ifile, i, retIthVal, minimum, maximum);
	if(returnvalue==0)
	{
		cout << "Min is {" << minimum << "}." << endl;
		cout << "Max is {" << maximum << "}.\n" << endl;
		cout << "Value " << i << " is {" << retIthVal << "}." << endl;
	}
	else if(returnvalue==1)
	{
		cout << "\nThe file is empty!" << endl;
	}
	else if(returnvalue==2)
	{
		cout << "Min is {" << minimum << "}." << endl;
		cout << "Max is {" << maximum << "}.\n" << endl;
		cout << "There aren't that many numbers in the file!" << endl;
	}
	return 0;
}

int processFile(ifstream& ifile, long i, long& retIthVal, long& minimum, long& maximum)
{
	int number=0,
		num;

	ifile >> num;
	maximum=num;
	minimum=num;
	while(ifile)
	{
		number++;
		if(i==number)
		{
			retIthVal=num;
		}
		if(num>maximum)
		{
			maximum=num;
		}
		else if(num<minimum)
		{
			minimum=num;
		}
		ifile >> num;
	}
	if(i>number)
	{
		return 2;
	}
	if(number == 0)
	{
		return 1;
	}

	return 0;
}
That was expected , you function returned exactly what you instructed it too and displayed exactly what it got from ifile .-858993460 is a garbage value ifile read into num before hitting end of file on
Where in the code did it go wrong? I can't find the mistake. If nothing is read in, what values need to change?
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