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From: Martin Ambuhl <mambuhl AT earthlink DOT net>
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Subject: Re: Problem in for loop (TC++ IDE)
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Date: Thu, 26 May 2005 07:57:52 GMT
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aveo wrote with the strange subject line 'Problem in for loop (TC++ IDE)':

(If you are really using TC++, posting to a gcc newsgroup is pretty 
silly, and the IDE has nothing to do with errors in your program or with 
the compiler.)

> hi all,
> I came accross some problem in executing for loop.
> 
> void main()
   ^^^^ main returns an int in both C and C++
> {
>    for(;0;cout<<1)
>           cout<<2;
             ^^^^
     You are missing both a needed header and a namespace specifier (or 
using statement).  As it is, 'cout' is an undeclared variable in both 
C++ (and in C, where it must be an integral variable for the left shifts 
to be legal).

> }
> 
>          it gives me 21 as an output instade of blank output. Please
> let me know the reason behind it, as early as possible.

The legal C++ program below yields no output other than the terminating 
newline from the 'cout << endl;'.


#include <iostream>
using namespace std;

int main()
{
     for (; 0; cout << 1)
         cout << 2;
         cout << endl;
}