trouble with long

[Simen Kjaeraas]

On Tue, 16 Jul 2013 12:37:58 +0200, eles <eles at eles.com> wrote:

> $cat test.cpp:
>
> #include <iostream>
>
> int main() {
> 	long long x = 1250000000 * 2;
> 	std::cout << x << std::endl;
> 	return 0;
> }
>
> g++-generated exe displays: -1794967296
>
> $cat test.d:
>
> import std.stdio;
>
> int main() {
> 	long x = 1250000000 * 2;
> 	writefln("%d",x);
> 	return 0;
> }
>
> dmd- and gdc-generated exes display: -1794967296
>
> compiling with g++ at least gives a warning:
>
> warning: integer overflow in expression [-Woverflow]
> long long x = 1250000000 * 2;
>
> Both dmd and gdc do not complain in any way.
>
> Isn't the promotion to int so awful? Better ideas? (yes, I know
> about casting to long).

This is where integer suffixes can help:

long x = 1250000000L * 2;

-- 
Simen