Icy North Technologies

[nanotiger]

Hi,

This is a simple question that puzzles me. Why string.format("%u %x %X") outputs 0 for all negative numbers.

Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> = string.format("%d, %i, %u, %x, %X", -100,-100, -100, -100, -100)
-100, -100, 0, 0, 0

[lhf]

Under Linux and Mac OS X, I get

-100, -100, 4294967196, ffffff9c, FFFFFF9C

Anyway, %u, %x, %X only handles unsigned numbers.

[nanotiger]

Weird, I've tested it on Mac OSX and an embedded system with ARM processor. Both report
> = string.format("%d, %i, %u, %x, %X", -100,-100, -100, -100, -100)
-100, -100, 0, 0, 0

I would expect Lua handles %u, %x, %X as in C just like your result.
int main()
{
printf("%d, %i, %u, %x, %X\n", -100, -100, -100, -100, -199);
}
-100, -100, 4294967196, ffffff9c, FFFFFF9C

Are there different options to build Lua which might cause the difference?