Given an array of two 32-bit ints, write a function that returns a 64-bit int that contains the value of the two ints concatenated together. (C++

Posted on 2011-02-22
Last Modified: 2012-08-13
Please tell me how I can do this:

Given an array of two 32-bit ints, write a function that returns a 64-bit int that contains the value of the two ints concatenated together. (C++)

Question by:dshrenik
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LVL 86

Accepted Solution

jkr earned 167 total points
ID: 34954472
Without giving you a complete solution to your assignment, consider the following (

  struct {
    unsigned int LowPart;
    int HighPart;

  __int64_t Full64Int;

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LVL 32

Assisted Solution

phoffric earned 167 total points
ID: 34957501
You didn't mention whether element 0 of the array has the LSW or the MSW.

You could set the 64-bit word to the MSW, then shift it to the left (<<) and then add in, or, probably faster, or in (|) the LSW.
LVL 11

Assisted Solution

cup earned 166 total points
ID: 34958691

      unsigned int lo;
      unsigned int hi;
   } int32;
   long long int64;

I'm not sure if __int64_t is MS specific or not.  long long will work on both Linux and Windows.

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