A logic in finding the numbers of array

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Hi.

Here I have an array

C#

short days = 80;
short[] possibleDays = new short[] { 1, 2, 4, 8, 16, 32, 64 };

Now I want to get the numbers for which the given variable days is the sum of any digits in the array.
For example
80 = 64+16 (if I/p is 80, O/P should be 64,16)
37 = 32 + 4 + 1 (If I/P is 37, O/P should be 32 , 4 , 1 ).

Can you please help me writing a logic to my scenario.

Thanks.

Posted 20-May-15 18:33pm

Saikrishna35

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2 solutions

Solution 1

you can Try this It's Working.....

Console.WriteLine("Enter Input:");
          string input = Console.ReadLine();
          double days = Convert.ToDouble(input);
          //short days = 80;
          short[] possibleDays = new short[] { 1, 2, 4, 8, 16, 32, 64 };

          short sum = 0;
          string totalValues = string.Empty;
          for (int i = possibleDays.Length; i >= 1; i--)
          {
              sum += possibleDays[i - 1];
              if (sum == days)
              {
                  totalValues += possibleDays[i - 1] + ";";
                  break;
              }
              else
              {
                  if (sum > days)
                  {
                      sum -= possibleDays[i - 1];
                  }
                  else
                  {
                      totalValues += possibleDays[i - 1] + ";";
                  }
              }
          }
          totalValues = totalValues.TrimEnd(';');
          Console.WriteLine(totalValues);
          Console.ReadKey();

Posted 20-May-15 18:56pm

Pankit Patel

Updated 20-May-15 18:57pm

v2

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Frankie-C · Accepted Answer · 2015-05-20T21:36:00

Solution 2

Your array is an array of binary power:

2^0=1, 2^1=2, 2^2=4, 2^3=8, 2^4=16, 2^5=32, 2^6=64

Simply check corresponding bits states:

C++

for (i=1; i<=64; i<<=1)
  if (day & i)
    printf(%d ", i);

Posted 20-May-15 21:36pm

Frankie-C

Updated 20-May-15 22:18pm

v4

Comments

CPallini 21-May-15 3:51am

5.Please note:
i<<1
shoud be instead
i<<=1

Frankie-C 21-May-15 3:53am

Grazie Carlo

CPallini 21-May-15 10:41am

:-)