#include <iostream>
using namespace std;

int max3(int num1, int num2, int num3)
{
if (num1 >= num2)
   if ( num1 >= num3)
   	return num1;
   else
   	return num3;
else if (num2 >= num3)
	return num2;
else
	return num3;

}

void changeup(int &val1, int &val2) {
	int temp = val1;
	val1 = val2;
	val2 = temp;
}

int main() {
	int x, y, z;
	cout << "Enter 3 integers: ";
	cin >> x >> y >> z;
	cout << "The largest of those is: " << max3(x,y,z) << endl;

	cout << "before: X is " << x <<" and Y is " << y << endl;
	changeup(x,y);
	cout << "after: X is " << x <<" and Y is " << y << endl;

	return 0;

}