Class Examples	
				    7/15/02
		
Example #1
----------
#include <iostream.h>
#include <math.h>

void swap(double &a, double &b);

int main() {

  double x, y;
  cout << "Enter two numbers.\n";
  cin >> x >> y;
  if (x>y)
    swap(x,y);
  cout << "Your numbers in order are " << x << " and " << y << endl;
}

void swap(double &a, double &b) {

  double temp = a;
  a = b;
  b = temp;
}


Example #2
----------
#include <iostream.h>
#include <math.h>

void swap(double &a, double &b);
void sort(double &a,double &b,double &c);
int main() {

  double x, y, z;
  cout << "Enter three numbers\n";
  cin >> x >> y >> z;
  sort(x,y,z);
  cout << "Your sorted numbers are : ";
  cout << x << " " << y << " " << z << endl;
}

void sort(double &a, double &b, double&c) {

  if (a>b)
    swap(a,b);
  if (b>c)
    swap(b,c);
  if (a>b)
    swap(a,b);
}

Example #3
----------
#include <iostream.h>

int f(int& a);

void main() {
  
  int i = 1;
  int j = 2;
  if ((f(j)>1) || (i<=3)) //LINE 9
    j = j + 1;
  cout << i << " is i.\n";
  cout << j << " is j.\n";
}

int f(int& a) {
  a = 1000;
  return 50;
}

Example #4
----------
#include <iostream.h>

int f1(int a, int &b);
void f2(int &x, int &y);

void main() {

  int x=5, y=2;
  y = f1(y, x);
  cout << "x = " << x << " y = " << y << endl;
  f2(x,y);
  cout << "x = " << x << " y = " << y << endl;
  
}

int f1(int a, int &b) {

  int x=2, y;
  y = a+b;
  b = x*y;
  a = 15-b;
  x++;
  cout << "a = " << a << " b = " << b << " x = " << x << " y = " << y << endl;
  return b-a;
}

void f2(int &x, int &y) {

  int a=1, b=2;
  x = a*b*y;
  y = a+b+x;
  a = 3*b+5;
  if (a > y)
    b++;
  cout << "a = " << a << " b = " << b << " x = " << x << " y = " << y << endl;

}