divide by zero error ignored !

[aniait]

Hi,

I just came across a faulty code of mine when working on Symbian C++ code. It threw an exception for the code fragment below (or something similar to this):

int x;
for(int i = 2; i >= 0 ; i--)
	{
	x = 5 % i; // [B]Divide by zero exception here when i = 0.[/B]
	x++;
	}

So, I tried the same on Visual C++ and gcc compiler. The funny thing is, I do not get an exception when I run the code. An exception is thrown only in debug mode.

Can someone tell me what is happening here?

[Banfa]

Well when I built using VS 2005 I get an exception in when run in the debugger and when run normally (although they are handled slightly differently).

I believe divide by 0 is undefined behaviour so anything could happen.

[JosAH]

I believe divide by 0 is undefined behaviour so anything could happen.

True; this is what ANSI C99 has to say about it:

[#5] The result of the / operator is the quotient from the
division of the first operand by the second; the result of
the % operator is the remainder. In both operations, if the
value of the second operand is zero, the behavior is
undefined.

So there is no defined need to throw an exception when a division by zero
occurs although most hardware has support for it.

kind regards,

Jos