Console C++ application. Gets user input and checks to see if it is a valid integer.

main.cpp

#include <iostream>

using namespace std;
bool isInt(char tempNumber);

int main()
{
	char tempNumber[10];

	while ( true )
	{
		cout << "Enter a number: ";
		cin >> tempNumber;
		bool isIntMain = true;
		for ( int i = 0; i < tempNumber[i]; i++ )
			if ( ! isInt( tempNumber[i] ) )
				isIntMain = false;

		if ( isIntMain == false )
			cout << tempNumber << " Invalid Integer" << endl;
		else		
			cout << tempNumber << " Valid Integer" << endl;

		cout << endl;
	}
	cin.ignore();
	cin.get();
	return 0;
}

bool isInt(char tempNumber)
{
	bool isInt = false;

	for (int i = 0; i < 10; i++)
		if ((int)tempNumber == i + 48)
			isInt = true;

	return isInt;
}