Please explain CVI question #335358: using the operator of bit-shift twice on the same line of code produces incorrect results
Hello
I just stumbled on http://www.ni.com/white-paper/12323/en#335358_by_Category.
With the help of the bit-shift operator twice on the same line of code produces incorrect results.
Workaround: Separate the operations of shift of two bits in two distinct lines of code.
Reported Version: 9.0 | Solved Version: N/A | Added the: 14/02/2012 |
Could someone please explain what kind of construction causes such a question?
I have not noticed problems again and not have not noticed or found a thread about it.
Thank you.
The reported scenario looks like this:
unsigned int a = 1, b = 62; unsigned long long result = 1ULL << a << b;
The problem arises because of the temporary variable used when do two little is placed in the same line. This separation into two lines will produce correct results:
unsigned int a = 1, b = 62; unsigned long long result = 1ULL << a; result = result << b;
Tags: NI Software
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