How do I find the sum of the series up to n terms.

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C#

input:4 terms 9+99+999+9999
expected output = 11106

What I have tried:

i tried but i didnt get output.

Posted 7-Apr-21 6:31am

dheeraj chowdary

Updated 7-Apr-21 20:37pm

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Patrice T 7-Apr-21 12:42pm

Show your code

2 solutions

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OriginalGriff · Answer 1 · 2021-04-07T07:43:00

Solution 1

This is not a complex task, not even slightly.
All you have been asked to do is sum a number of terms, and you know how to do that - just add them up!

1) Get the number of terms.
2) Preset the total to 0; and the initial term to 9
3) Loop from zero to N - 1
3.1) Add the term to the total.
3.2) Multiply the term by ten, and add 9.
4) Print the total.

Posted 7-Apr-21 7:43am

OriginalGriff

Comments

Maciej Los 8-Apr-21 2:26am

You're amazing, Master!

Jung-hoon's · Answer 2 · 2021-04-07T15:27:00

Solution 2

private int Nsum(int cnt)
{
char pad = '9';
string str = pad.ToString();

int rtnValue = 0;

for (int i = 0; i < cnt; i++)
{
rtnValue = rtnValue + int.Parse(str.PadLeft(i + 1, pad));
}

return rtnValue;
}

Posted 7-Apr-21 15:27pm

Jung-hoon's

Comments

Maciej Los 8-Apr-21 2:27am

Do you really want to work on chars?

Jung-hoon's 8-Apr-21 20:22pm

Is there a simpler way?

Maciej Los 9-Apr-21 0:16am

Yes. Please, follow the instruction in solution #1.
[EDIT]
For example:

int inp = 4;
int term = 9;
int temp = term;
int total = term;
for(int i=0; i<inp; i++)
{
	temp *= 10;
	temp += term;
	Console.WriteLine($"current={total}; next={temp}");
	total += temp;
}

Jung-hoon's 9-Apr-21 2:59am

First of all, I'm sorry I'm not good at English.

Solution 1 is the basic method.
Faced with the problem, I thought it would be fun to use char.

You thought there was a new method that wasn't basic.
i'm sorry ^^

Jung-hoon's 9-Apr-21 3:03am

Thank you for responding to my playful answer.

You are a good man ^^

Maciej Los 9-Apr-21 5:13am

Thank you :)
:thumbsup:
Best wishes to you!