Question

I’m in the process of porting some ANSI C++ code to C#… and this is killing me right now.

Both tests have value = 6844268.

Test code:

value >> 12 value & 0x00000FFF 

C++ returns 18273 and 29497, whereas C# returns 1670 and 3948. I’ve tried every possible combination of types in C# (int, uint, long, ulong, Int64…), but no go 🙁

Original value in C++ is unsigned int. Anyone have any ideas?

EDIT: Argh, I messed up my debugging. Was looking at array[value] instead of value. My bad.

Answer 1

Check your C++ definitions for overridden >> operator code perhaps?

C# is calculating the right values, are you absolutely 100% sure your values are what you say they are?

Just to go through the motions:

6844268 = 11010000110111101101100 >> 12   =             11010000110.111101101100 result  =             11010000110 result  = 2 + 4 + 128 + 512 + 1024 = 1670    18273       =   100011101100001 6844268 >> 12 =       11010000110                         ^^^^  ^^^ <-- mismatches 

they don’t line up, there must be some details you’re not seeing in your code there.