# 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

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

## 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.

### 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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