Strange problem in for-loop

[markus.litz]

Hello,

I have a strange problem with some of my c++ code. I have a normal for-
loop like this

for(int i = 1; .....

on MS-Windows with a Microsoft compiler everything is alright, but
when I compile the same source on Linux with gcc-3.4, the variable "i"
is "0" in the first pass of the loop.

Anyone knows the answer of my problem? Maybe a compiler flag?

Thx!
Markus

 

[Victor Bazarov]

I have a strange problem with some of my c++ code. I have a normal
for- loop like this

for(int i = 1; .....

Not sure what's normal about five periods. I've never seen any
program that would actually use that construct.

on MS-Windows with a Microsoft compiler everything is alright, but
when I compile the same source on Linux with gcc-3.4, the variable "i"
is "0" in the first pass of the loop.

Anyone knows the answer of my problem? Maybe a compiler flag?

Maybe. But for the hell of it, I cannot make your program compile
anywhere. My compiler keeps telling me something in line with
"an executable statement outside of any function". I suggest to
look in the FAQ, #5.8.

V

 

[markus.litz]

Not sure what's normal about five periods. I've never seen any
program that would actually use that construct.

I mean a standard for-loop like

for (int i=1; i<10; i++)
{
if(i=9) {...}

}

but "i" start from 0 inside the loop, not from 1 and I don't know why.
This is strange because under windows everything runs fine.

 

[Victor Bazarov]

Not sure what's normal about five periods. I've never seen any
program that would actually use that construct.

I mean a standard for-loop like

[..]

I mean you need to read the FAQ 5.8 and do what it says. For real!

V

 

[Thomas Tutone]

I mean a standard for-loop like

for (int i=1; i<10; i++)
{
if(i=9) {...}

}

but "i" start from 0 inside the loop, not from 1 and I don't know why.
This is strange because under windows everything runs fine.

Give us a short, self-contained program that demonstrates the error.
Or, please copy and paste the following program, compile and execute
it, and report back on the results:

#include <iostream>

int main()
{
bool flag = false;
for (int i = 1; i<10; ++i) {
if (i==0) flag = true;
}
std::cout << "Markus was "
<< (flag ? "right" : "wrong")
<< '.';
}

Best regards,

Tom

 

[Stefan]

I mean a standard for-loop like

for (int i=1; i<10; i++)
{
if(i=9) {...}

}

but "i" start from 0 inside the loop, not from 1 and I don't know why.
This is strange because under windows everything runs fine.

Hmm, if(i=9) {...} *assigns* the value 9 to i (the result of which
evaluates to true). Are you sure that it shouldn't be "=="?

 

[Victor Bazarov]

Hmm, if(i=9) {...} *assigns* the value 9 to i (the result of which
evaluates to true). Are you sure that it shouldn't be "=="?

Still, that wouldn't cause the 'i' to "start from 0 inside the loop",
would it? That's why I insist that the OP posts real complete code.

V