Java Program to Display Odd Numbers From 1 to 100

In this section, we will create a Java program to display odd numbers from 1 to 100. To learn the Java odd number program, you must have the basic knowledge of Java for loop and if statement.

We can use different Java loops to display odd numbers:

Using Java for Loop
Using nested-if Statement
Using while Loop

Using Java for Loop

In the following example, we have declared a variable named number and initialized it with 100 (the limit to print the odd number). We have used a for loop that executes up to 100 times and for each iteration of i the if statement checks the number is odd or not. After printing each odd number, the value if i is increased by 1.

In order to check the number, we have divided the number by 2 if it leaves a remainder, the number is odd and the print statement prints that number.

DisplayOddNumbersExample1.java

public class DisplayOddNumbersExample1
{
public static void main(String args[]) 
{
int number=100;
System.out.print("List of odd numbers from 1 to "+number+": ");
for (int i=1; i<=number; i++) 
{
//logic to check if the number is odd or not
//if i%2 is not equal to zero, the number is odd
if (i%2!=0) 
{
System.out.print(i + " ");
}
}
}
}

Output:

List of odd numbers from 1 to 100: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99

Using nested-if Statement

The following program is slight different from the above program because we have defined a method that contains the logic to check odd number. Inside the method, we have used nested-if statement.

DisplayOddNumbersExample2.java

public class DisplayOddnumbersExample2
{
public static void main(String[] args) 
{
System.out.println("List of odd numbers: ");     
//method calling
displayOddNumbers(1, 100); 
} 
//method that checks the number is odd or not
private static void displayOddNumbers(int number, int end) 
{ 
if(number>end) 
return; 
if(number%2!=0) 
{ 
//prints the odd numbers
System.out.print(number +" "); 
//calling the method and increments the number by 2 if the number is odd
displayOddNumbers(number + 2, end); 
} 
else 
{ 
//increments the number by 1 if the number is odd
displayOddNumbers(number + 1, end); 
} 
} 
}

Output:

List of odd numbers: 
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99

Using while Loop

In the following program, we have replaced the for loop with while loop.

DisplayOddNumbersExample3.java

import java.util.Scanner;
public class DisplayOddNumbersExample3
{
public static void main(String[] args) 
{
int number, i;
Scanner sc=new Scanner(System.in);
System.out.print("Enter the limit: ");
number = sc.nextInt();	
i=1; 
System.out.print("Lit of odd numbers: ");
//the while loop executes until the cond\ition become false
while(i<=number)
{
//prints the odd number
System.out.print(i +" "); 
//increments the variable i by 2
i=i+2;
}	
}
}

Output:

Enter the limit: 100
Lit of odd numbers: 1 3 5 7 9 11 15 17 13 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 83 81 85 87 89 91 93 95 97 99

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