Hi Munna,
in your example VI you always produced an U64 result, so my math should provide the same result. (I hope I got the byte order correct.)
To also allow I32 (signed values!) you need to apply some conversion steps in between or use a case structure to differ between unsigned and signed values…
Best regards,
GerdW

using LV2016/2019/2021 on Win10/11+cRIO, TestStand2016/2019