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Why the reverse output?

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Join Date: Aug 2006

Posts: 2

Reputation: nwiner is an unknown quantity at this point

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nwiner

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Newbie Poster

Why the reverse output?

Aug 1st, 2006

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <iostream.h>
int fred[] = { 11, 22, 33, 44 };
int *fp;
int main(int argc, char *argv[])
{
 for (int i=0; i<argc; i++)
  cout << argv[i];
 cout << endl << "Hello world." << endl;
 fp = fred;
 cout << *fp++ << *fp++ << *fp++ << *fp++ << " - Why is this?" << endl;
 fp = fred;
 cout << fp[0] << fp[1] << fp[2] << fp[3] << endl;
 fp = fred;
 cout << *fp++;
 cout << *fp++;
 cout << *fp++;
 cout << *fp++;
 cout << endl;
 fp = fred;
 for (i=0; i<4; i++)
  cout << *fp++;
 cout << endl;
 return 0;
}
#include <iostream.h>
int fred[] = { 11, 22, 33, 44 };
int *fp;
int main(int argc, char *argv[])
{
 for (int i=0; i<argc; i++)
  cout << argv[i];
 cout << endl << "Hello world." << endl;
 fp = fred;
 cout << *fp++ << *fp++ << *fp++ << *fp++ << " - Why is this?" << endl;
 fp = fred;
 cout << fp[0] << fp[1] << fp[2] << fp[3] << endl;
 fp = fred;
 cout << *fp++;
 cout << *fp++;
 cout << *fp++;
 cout << *fp++;
 cout << endl;
 fp = fred;
 for (i=0; i<4; i++)
  cout << *fp++;
 cout << endl;
 return 0;
}

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C++ Syntax (Toggle Plain Text)

 /* output<blockquote> COUTTRY.EXEonetwothree
Hello world.
44332211 - Why is this?
11223344
11223344
11223344
</blockquote>*/

Thanks

Last edited by WolfPack; Aug 1st, 2006 at 1:40 pm.

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Join Date: May 2006

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WaltP

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Posting Sensei

Re: Why the reverse output?

Aug 1st, 2006

Becuse of this: http://c-faq.com/expr/evalorder2.html

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Join Date: Dec 2005

Posts: 5,850

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Salem

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Void main'ers are DOOMed

Re: Why the reverse output?

Aug 1st, 2006

> Why the reverse output?
Make sure you understand the consequences of the link posted by WaltP

Even though you might be able to come up with an explanation of why the output is reversed, there is no telling what would happen in any similar circumstance.

Undefined behaviour is very specific, anything at all can happen and the problem is solely with your code. It is not a language issue or a compiler issue.