#include <iostream>

int main()
{
	int *x, y, z;
	char var;
	y = 1;
	z = 2;

	cout << "Which variable do you want to change -- y or z? ";
	cin >> var;

	if (var == 'z')
		x = &z;
	else
		x = &y; 

	*x = 7;

	cout << "y is " << y << " and z is " << z << endl;
}