array numbers which sum is dividing on 4

Question

I want to print numbers on label from 1-to 100

The number's sum must be dividing on 4.

Example:
print 35. because 3+5 = 8 .
8 dividing on 4.

This is code
from loop printing numbers. but how choose those numbers?
print those numbers from 1 to 100 ;

for (int i = 1; i < 100; i++)
{
     //select numbers wich sum is dividing on 4
     label3.Text += Convert.ToString(i) + " | ";
}

Answer is in this link [Sum of digits in C#](http://stackoverflow.com/questions/478968/sum-of-digits-in-c-sharp) of StackOverflow. And 8 dividing 4 is 8%4 ==0 — Jose Luis, Dec 30 '15 at 08:54

score 3 · Accepted Answer · edited May 23 '17 at 11:59

Stolen from Greg Hewgill answer's, you can use his algorithm and use remainder operator (%) like;

int sum, temp;
for (int i = 1; i < 100; i++)
{
     sum = 0;
     temp = i;
     while (temp != 0)
     {
         sum += temp % 10;
         temp /= 10;
     }

     if (sum % 4 == 0)
     {
         Console.WriteLine(i);
     }
}

Result will be;

Here a demonstration.

score 1 · Answer 2 · edited Dec 30 '15 at 11:59

1

You should use a nested loop for that , and use the % operator (% means the rest of division):

for (int i = 1; i < 100; i++)
{
     for (int j = i; j < 100; j++)
     {
           //select numbers wich sum is dividing on 4
           if( (i+j)%4 == 0)
           {
                 label3.Text += Convert.ToString(i) + Convert.ToString(j) " | ";
           }
     }
}

edited Dec 30 '15 at 11:59

Soner Gönül

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answered Dec 30 '15 at 09:02

Bourbia Brahim

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array numbers which sum is dividing on 4

2 Answers2