Program to Find the sum of series 9+99+999.....+N

Problem statement:- Program to Find the sum of series 9+99+999+9999.....+N.

 Data requirement:-

   Input Data:- n

  Output Data:-Sum

  Additional Data:- i, p

Program in C
  

Here is the source code of the C Program to Find the sum of series 9+99+999+9999.....+N.

Code:

#include<stdio.h>

int main()

{

    int n;

    int sum=0,i;

    printf("Enter the range of number:");

    scanf("%d",&n);

    int p=9;

    for(i=1;i<=n;i++)

    {

            sum+=p;

            p=(p*10)+9;

    }

    printf("The sum of the series = %d",sum);

}

Input/Output:

Enter the range of number:5

The sum of the series = 111105

Program in C++

Here is the source code of the C++ Program to Find the sum of series 9+99+999+9999.....+N.

Code:

#include<iostream>

using namespace std;

int main()

{

    int n;

    int sum=0,i;

    cout<<"Enter the range of number:";

    cin>>n;

    int p=9;

    for(i=1;i<=n;i++)

    {

            sum+=p;

            p=(p*10)+9;

    }

    cout<<"The sum of the series = "<<sum;

}

Input/Output:

Enter the range of number:4

The sum of the series = 11106

Program in Java

Here is the source code of the Java Program to Find the sum of series 9+99+999+9999.....+N.

Code:

import java.util.Scanner;

public class Sum_Of_Series6 {

public static void main(String[] args) {

Scanner cs=new Scanner(System.in);

int n;

int sum=0,i;

     System.out.println("Enter the range of number:");

     n=cs.nextInt();

     int p=9;

     for(i=1;i<=n;i++)

     {

             sum+=p;

             p=(p*10)+9;

     }

     System.out.println("The sum of the series = "+sum);

     cs.close();

}

}

Input/Output:

Enter the range of number:

7

The sum of the series = 11111103

Program in Python

Here is the source code of the Python Program to Find the sum of series 9+99+999+9999.....+N.

Code:

n=int(input("Enter the range of number:"))

sum=0

p=9

for i in range(1,n+1):

    sum += p

    p=(p*10)+9

print("The sum of the series = ",sum)

Input/Output:

Enter the range of number:8

The sum of the series =  111111102

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