// standard headers
#include <iostream>		// include input-output stream
#include <conio.h>		// control return with user keystroke using getch();
#include <iomanip>		// allow manipulation (formatting) for output
#include <string>		// include string header
#include <fstream>		// include file stream header
#include <vector>		// include header file to use the vector class (in STL)

// standard namespace
using namespace std;

// function prototypes
void getData(vector<int>& data, int num);
void remove(vector<int>& data,int num,int delThis);


// main() function
int main()
{
	// variables
	int num = 10;
	int delThis;
	int counter;
	vector<int> data(num);
	vector<int>::iterator vecIter;

	getData(data,num);

	cout << "data that was input:" << endl << endl;

	for (counter = 0; counter < num; counter++)
	{
		cout << data[num] << endl;
	}

	cout << endl << endl << endl;
	cout << "Please enter a number to remove from the list: ";
	cin >> delThis;
	cout << endl << endl << endl;

	remove(data,num,delThis);

	cout << endl << endl;
	cout << "After searching and erasing your number " << delThis << ", here is the list of data:" << endl;
	for (counter = 0; counter < num; counter++)
	{
		cout << data[num] << endl;
	}



	// Return to system
	cout << "Press any key to exit.";
	_getch();
	return 0;
}


// secondary functions
void getData(vector<int>& data,int num)
{
	int counter;
	ifstream infile;

	infile.open("data.txt");

	for (counter = 0; counter < num; counter++)
	{
		infile >> data[counter];
	}
}

void remove(vector<int>& data,int& num,int delThis)
{
	int counter;
	int swapThis;
	bool found = false;

	for (counter = 0; counter < num; counter++)
	{
		if (data[counter] == delThis)
			found = true;
	}

	if (found == false)
		cout << "Number " << delThis << " was not found." << endl;
	else
	{
		cout << "Number " << delThis << " was found. Deleting..." << endl;
		for (counter = 0; counter < num; counter++)
		{
			if (data[counter] == delThis)
			{
				data.erase(counter);
				num = data.size();
			}
		}
	}
}

Quote://++it can sometimes be slightly more efficient than it++, because
// a temp. object doesn't need to be made

var++

++var