Java Program to Print Natural Numbers from 1 to N

Write a Java Program to Print Natural Numbers from 1 to N using For Loop, and While Loop with an example.

Java Program to Print Natural Numbers from 1 to N Example 1

This program allows the user to enter any integer value(the maximum limit value). Next, this Java program displays all the natural numbers from 1 to maximum limit value (N) using For Loop.

// Java Program to Print Natural Numbers from 1 to N 
import java.util.Scanner;

public class NaturalNumbers1 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int number, i;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter any Number : ");
		number = sc.nextInt();	
		
		for(i = 1; i <= number; i++)
		{
			System.out.print(i +"\t"); 
		}	
	}
}

First, we used the Java For loop to iterate from 1 to maximum value (Here, number = 6).

User entered value: number  = 6

For Loop First Iteration: for(i = 1; i <= 6; i++)
Condition is True. So, i Value printed (i.e., 1)

Second Iteration: for(i = 2; 2 <= 6; 2++)
Condition is True. It prints 2

Third Iteration: for(i = 3; 3 <= 6; 3++)
Condition is True. It prints 3

Fourth Iteration: for(i = 4; 4 <= 6; 4++)
Condition is True. 4 printed.

Fifth Iteration: for(i = 5; 5 <= 6; 5++)
Condition is True. It prints 5

Sixth Iteration: for(i = 6; 6 <= 6; 6++)
Condition is True. 6 printed

7th Iteration: for(i = 7; 7 <= 6; 7++)
Condition (7 <= 6) is False. So, the Java compiler exits from the For Loop

Java Program to Print Natural Numbers from 1 to N using While loop

This Java program to return natural numbers from 1 to N is the same as the above example, but we are using the While Loop.

// Java Program to Print Natural Numbers from 1 to N 
import java.util.Scanner;

public class NaturalNumbers2 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int number, i = 1;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter any Number : ");
		number = sc.nextInt();	
		
		while(i <= number)
		{
			System.out.print(i +"\t"); 
			i++;
		}	
	}
}

Please Enter any Number : 10
1	2	3	4	5	6	7	8	9	10	

Java Program to Print Natural Numbers from 1 to N using Method

This Java program for natural numbers is the same as the first example. But we separated the logic and placed it in a separate method.

// Java Program to Print Natural Numbers from 1 to N 
import java.util.Scanner;

public class NaturalNumbers3 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int number;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter any Number : ");
		number = sc.nextInt();	
		
		NaturalNumbers(number);
	}
	public static void NaturalNumbers(int num)
	{
		int i;
		
		for(i = 1; i <= num; i++)
		{
			System.out.print(i +" "); 
		}	
	}
}

Java natural numbers from 1 to 25 output

 Please Enter any Number : 25
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 

Java Program for Natural Numbers between a Range

This program allows entering Minimum and maximum value. Next, the Java program displays natural numbers between Minimum value and maximum value.

// Java Program to Print Natural Numbers from 1 to N 
import java.util.Scanner;

public class NaturalNumbers4 {
	private static Scanner sc;
	public static void main(String[] args) 
	{
		int minimum, maximum;
		sc = new Scanner(System.in);
		
		System.out.print(" Please Enter the Minimum value : ");
		minimum = sc.nextInt();			
		
		System.out.print(" Please Enter the Maximum value : ");
		maximum = sc.nextInt();	
		
		NaturalNumbers(minimum, maximum);
	}
	public static void NaturalNumbers(int min, int max)
	{
		int i;
		
		for(i = min; i <= max; i++)
		{
			System.out.print(i +" "); 
		}	
	}
}

Please Enter the Minimum value : 5
 Please Enter the Maximum value : 50
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50