I have a function where calculated values can reach higher values than the range of unsigned __int64 which is indicated by MS by 18,446,744,073,709,551,615. How can I test if a number has exceeded that range? I've converted the int into char and tried testing by checking the length with strlen. However, some values with a length longer than specified: for example if(strlen(charvar)>17) mysteriously escape. So how can I effectively test?
how to test if unsigned __int64 number exceeds range
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If you can use a modern compiler or Boost, then
lexical_cast
will do the job:See this link for the Boost library. You can definitely get this for VS 2008.
If this is Windows only you can also look at
_atoi64
and the like. See msdn. These returnI64_MAX
andI64_MIN
in case of over/underflow.