Warning about integer divisions in float expressions

[Thomas Holenstein]

Hello,

I am just to stupid.  Today, I searched another 2 hours a bug because
I wrote a nice little thing like that in a C++ program:

     double x = 1 / 2 / M_PI;

I just hate this integer division.  After being a bit angry about it,
I thought that gcc might warn about such an error.  

I thought about a rule like that:
If an integer division occurs in an expression which is later
converted into a float or double, gcc emits a warning.  Meaning:
int k = (int)(5 / 4 * M_PI);
or
     double k = 5 / 4;
would emit a warning.

but
     int k = 5 / 4;
won't

The reasoning behind this is, that if someone wants
     double d = k / l * 2.5;
where k and l are ints, he probably should write
     int tmp = k / l;
     double d = tmp * 2.5;
anyhow, because the other is very unreadable IMHO.

Could you please consider this?

Thomas
-- 
Thomas Holenstein
thomas@hex.ch