Lua script GG Lua has broken floating point number support?

[fllwr]

e.g. ((1592891810914 / 1000) == 1592891810) evaluates to true in GG

Obviously this is not the default behavior of Lua 5.3.

GG 99.0, arm64

GG_logcat_r99.0_16126_9_28.log.7z

 

In addition to broken division, converting fp number to string yields different result in GG.

print(1592891810914 * 0.001) gives out "1.592891810914E9" in GG, though it is "1592891810.914" in every other lua console I used.

[Enyby]

Like in Java, first operand define type of operation.

So you need make it float:

((1592891810914.0 / 1000) == 1592891810) -- false

In the second case it is same.

1.592891810914E9 == 1592891810.914

 

[fllwr]

1 hour ago, Enyby said:

Like in Java, first operand define type of operation.

So you need make it float:

((1592891810914.0 / 1000) == 1592891810) -- false

In the second case it is same.

1.592891810914E9 == 1592891810.914

 

It doesn't make sense and violates Lua manual, because Lua has separate int-div // and fp-div /. (and no formal way to convert between int/fp)

 

I tested it in other Lua 5.3 build:

((1592891810914 / 1000) == 1592891810) => false

print(1592891810914 * 0.001) => "1592891810.914"

1.592891810914E9 == 1592891810.914 is a problem: it means string conversion is incompatible with other Lua build. (e.g. serialization creates different output)

 

>> ((1592891810914.0 / 1000) == 1592891810) -- false

This is not even a workaround because in practice, since variables could be int or fp.

Maybe +.0 or + -.0 can convert int to fp for variables...

[Enyby]

Serialization number to string is implementation specific.

Yes. You can do 0.0 + int_var for get float var. First variable define type of result.