Java Program to Print the Series 1 11 111 1111 … N

111 111 1111: In the previous article, we have discussed about Java Program to Find Sum of Series a^2 + a^2/2 + a^2/3 + …… + a^2/10

In this article we are going to see how to print the series 1 11 111 1111 … N using Java programming language. On addition of 1 11 111 1111…N we add from the beginners view some basic series 1 11 111 pattern in java, print pattern 1 11 111 in java, Draw print pattern in java, 1 11 111 series in java, How to print 1 11 111 in java, print pattern 11, 1111, 111111 in java, 1 11 111 1111 pattern in java and examples like:

For Example, Num= 4, The Pattern Should Be: 1 11 111 1111, For Example, If Num= 3, The Pattern Should Be: 11 1111 111111.

Also Read: Java 1 4 1 – Java Program to Print Series 1 4 9 16 25 36 …N

Java Program to Print the Series 1 11 111 1111 … N

In this series the it can be seen that numbers at each position i ‘1’ is repeated i times.

For example:

If at 1st position there is only one ‘1’, at 5th position there are 5 ‘1’s.

Let’s see different ways to print the series.

By Using User Input Value
By Using User Defined Method

Method-1: Java Program to Print the Series 1 11 111 1111 … N By Using User Input Value

Approach:

Create Scanner class object.
Prompt the user to enter a number.
Initialize a variable term to 1.
Run a for loop i=1 to n.
Inside the loop, print the term and the update term as term = term * 10 + 1

Program:

import java.util.Scanner;
public class Main {
    public static void main(String[] args)
    {
        // create a Scanner object
        Scanner sc = new Scanner(System.in);
        // prompt the user to enter the number of terms
        System.out.print("Enter the number of terms: ");
        int n = sc.nextInt();
        // initialize the variable term to 1
        int term = 1;
        // loop to print the series
        for (int i = 1; i <= n; i++) 
        {
            System.out.print(term + " ");
            // update the value of term
            term = term * 10 + 1;
        }
    }
}

Output:

Enter the number of terms: 5
1 11 111 1111 11111

Method-2: Java Program to Print the Series 1 11 111 1111 … N By Using User Defined Method

Approach:

Create Scanner class object.
Prompt the user to enter a number.
Call the method to print the series.
In the method, Initialize a variable term to 1.
Run a for loop i=1 to n.
Inside the loop, print the term and the update term as term = term * 10 + 1

Program:

import java.util.Scanner;
public class Main
{
    public static void main(String[] args)
    {
        // create a Scanner object
        Scanner sc = new Scanner(System.in);
        // prompt the user to enter the number of terms
        System.out.print("Enter the number of terms: ");
        int n = sc.nextInt();
        // call the printSeries method
        printSeries(n);
    }
    // method to print the series
    private static void printSeries(int n)
    {
        // initialize the variable term to 1
        int term = 1;
        // loop to print the series
        for(int i = 1; i <= n; i++) 
        {
            System.out.print(term + " ");
            // update the value of term
            term = term * 10 + 1;
        }
    }
}

Output:

Enter the number of terms: 5
1 11 111 1111 11111

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