Code doesn't output to console

Hi. Can someone explain why this doesn't output to a console window using Dev-C++. system("PAUSE") doesn't work either. Thanks

Code:

#include<iostream>
using namespace std;

int fn(int x, int y)
{
  if(x==y)
    return x;
  if(x<y)
  {
    int temp;
    temp=x;
    x=y;
    y=x;
  }
  return fn(x-y,y);
}

int main()
{
  cout<<fn(27, 15);
  cin.get();
  return 0;
}

What is your function actually supposed to do ? I think you meant x-1 and not x-y

And he probably meant to make y = temp instead of y = x.

The only thing I can think of is you might not be using a console project. I never use DevC++ but prefer to stick to the command prompt.

Actually, I believe that this function is an example of recursion. I really do mean fn(x-y,y). Maybe it should be:

Code:

...
temp=x;
x=y;
y=temp;
...

Originally Posted by smitsky

Actually, I believe that this function is an example of recursion. I really do mean fn(x-y,y). Maybe it should be:

Code:

...
temp=x;
x=y;
y=temp;
...

That would be my guess. Did you try it? What did you intend this code to do? (Or, if you got it from someone/somewhere else, what do you think it's supposed to do?)

Heres an example of what you could try to do to track it down yourself:

Code:

int fn(int x, int y)
{
  int retval;

  if(x==y)
    return x;
  if(x<y)
  {
    int temp;
    temp=x;
    x=y;
    y=x;
  }
  cout << "before calling fn(" << x-y << ", " << y << ")" << endl;
  retval = fn(x-y,y);
  cout << " returning from fn(), with retval = " << retval << endl;
  return retval;
}

cout<< is a wonderful debugging tool.

Regards,

Dave

27x - 15y = 12x, 15y
swap
15x - 12y = 3x, 12y
swap
12x - 3y = 9x, 3y
9x - 3y = 6x, 3y
6x - 3y = 3x, 3y

i'll be damned.....

yea, change it to this
cout << "See, your code will print if you printed it here";
if(x<y)
{
int temp;
temp=x;
x=y;
y=temp;
}


it's not that your code isn't printing...it's never ending and never reaches the cout....