Some Casting question

[kmp84]

Hello All,
Is there any problem on this code if not do some cast manipulation?
(Store data as int16 and return only LSB Byte):

[Ttelmah]

Obvious thing is that len is not initialised, and could contain anything. You might sum one byte, or 255.....

You are actually performing teo implicit casts. C does this all the time. If you pass any variable of the 'wrong' type, it'll attempt to cast it to the target type.

So the arithmetic when you add data[i], is 16bit, and this is converted to a 16bit value when used. Then tmp is cast to an 8bit value when passed to the return.

[kmp84]

Hello,
Yes "len" and "tmp" has to be initialized. It's my mistake. Main focus was typecasting.
Thanks Mr.Telmah!