In C# Sum Of Digits For Very Big Number

Question

1.00/5 (4 votes)

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C# How to do Sum of Digits for very big number in a textbox 4534534534543533453432432434324324324234 and result display in other text box as 140 / 14 / 5. if number is small ex. 45345345343 result text box display as 43 / 7. Even smaller ex.45 display as 9. Please any body help it is urgent for my project.
It is not for my school/college project ... sorry for bad English...
Code done so far...

C#

 public long DigitSum(String BigNumberStr,int len)
    {
        int total = 0;       
        int s=BigNumberStr.Length;

        if (len == 10)
        {
            for (int i = 0; i < s; i++)
                total += int.Parse(Convert.ToString(BigNumberStr[i]));
        }
        else if (len == 100)
        {
            for (int i = 0; i < s; i++)
                total += int.Parse(Convert.ToString(BigNumberStr[i]));
        }
            
                return total;
 }
fun.DigitSum(TextBox2.Text + TextBox10.Text, 100);
fun.DigitSum(TextBox2.Text + TextBox10.Text, 1000);

But it's not working please help somebody... Result display in following format..
2132 = 8
213245 = 17 / 8
21324545454454545365756756 = 116 / 17 / 8

Posted 1-Sep-14 8:43am

amith9

Updated 2-Sep-14 0:06am

v5

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Comments

[no name] 1-Sep-14 14:54pm

"I want" is not a question or a problem. Just because you waited until the day before your homework assignment was due, does not make it urgent for us. It's not urgent at all. If it were any kind of urgent, you would have shown us what effort you have made and described an actual problem with the code that you have written.

Sergey Alexandrovich Kryukov 1-Sep-14 15:09pm

Homework? Not a question. Not acceptable as question. Not urgent. Just the abuse.
—SA

George Jonsson 2-Sep-14 5:35am

The code above cannot even compile as your parameter list in the method call doesn't match the method declaration.
public long DigitSum(String BigNumberStr) : 1 parameter of type string
fun.DigitSum(TextBox2.Text + TextBox10.Text, 100); : 2 parameters, string and int
So what is not working for you?

4 solutions

Solution 1

We do not do your homework: it is set for a reason. It is there so that you think about what you have been told, and try to understand it. It is also there so that your tutor can identify areas where you are weak, and focus more attention on remedial action.

Try it yourself, you may find it is not as difficult as you think!

Hint: Start with the BigInteger structure[^]

Posted 1-Sep-14 8:55am

OriginalGriff

Comments

Sergey Alexandrovich Kryukov 1-Sep-14 23:03pm

Even though BigInteger is amazingly good type, it is totally unrelated to this home assignment. Strictly speaking, in certain sense, the input is not really a "number"; this is already a string which is supposed to contain only the digits. It makes the problem well too trivial, of course.
—SA

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CPallini · Accepted Answer · 2014-09-01T09:45:00

Solution 2

Well, it looks a pretty trivial task, a simple loop over the string characters would do the trick. Just reproduce the algorithm you would use to perform the same task with pencil and paper.

Posted 1-Sep-14 9:45am

CPallini

Comments

Sergey Alexandrovich Kryukov 1-Sep-14 23:01pm

5ed.
—SA

CPallini 2-Sep-14 1:44am

Thank you.

Matt T Heffron 2-Sep-14 13:34pm

+5

CPallini 2-Sep-14 13:56pm

Thank you.

Dave Kreskowiak · Accepted Answer · 2014-09-01T14:15:00

Solution 3

You're thinking about wrong. It's not a "very big number". It's a string of characters that just happen to be digits.

So, enumerate the characters in the string and get the integer value of each character and add them up.

No, I'm not writing the code for you because this is an obvious homework assignment. You've already been given everything you need to write this in your class.

Posted 1-Sep-14 14:15pm

Dave Kreskowiak

Comments

Sergey Alexandrovich Kryukov 1-Sep-14 23:00pm

Best answer so far, a 5.
—SA

amith9 2-Sep-14 5:12am

Thanks...i have done something with your guidelines but it's not working properly...

Sergey Alexandrovich Kryukov 2-Sep-14 11:29am

Well, it means your "something" is wrong. You can show your code; and we can see where is your bug...
—SA

Matt T Heffron 2-Sep-14 13:35pm

+5

ClimerChinna · Accepted Answer · 2014-09-01T23:38:00

Solution 4

try below code

C#

string sum = TB1.Text;
       do
       {
           int val = 0;
           for (int i = 0; i < sum.Length; i++)
           {
               val += int.Parse(sum[i].ToString());
           }
           sum = val.ToString();
       }
       while (sum.Length > 1);
       Label1.Text = sum;

Posted 1-Sep-14 23:38pm

ClimerChinna

Updated 1-Sep-14 23:46pm

v3

Comments

amith9 2-Sep-14 10:22am

Please correct the following code..
Hello ClimerChinna, thank u very much for your help, it is working. But how to find sum of digits from two textboxes, the following code properly not working..Thanks in advance

TextBox10.Text = Convert.ToString(fun.DigitSum(TextBox2.Text + TextBox10.Text, 2)) + "/" + Convert.ToString(fun.DigitSum(TextBox2.Text + TextBox10.Text, 1));

public string DigitSum(String BigNumberStr,int len)
{
while (BigNumberStr.Length > len)
{
int val = 0;
for (int i = 0; i < BigNumberStr.Length; i++)
{
val += int.Parse(BigNumberStr[i].ToString());
}
BigNumberStr = val.ToString();
}

return BigNumberStr;
}

ClimerChinna 3-Sep-14 0:32am

i could not understand your problem, sum of digits from 2 textboxes means
1) you want to add the numbers then calculate sum of digits
2) You want to concatenate both numbers then calculate sum of digits

tell me what you wanted to do