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

  1. public class DisplayOddNumbersExample1  
  2. {  
  3. public static void main(String args[])   
  4. {  
  5. int number=100;  
  6. System.out.print(“List of odd numbers from 1 to “+number+”: “);  
  7. for (int i=1; i<=number; i++)   
  8. {  
  9. //logic to check if the number is odd or not  
  10. //if i%2 is not equal to zero, the number is odd  
  11. if (i%2!=0)   
  12. {  
  13. System.out.print(i + ” “);  
  14. }  
  15. }  
  16. }  
  17. }  

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

  1. public class DisplayOddnumbersExample2  
  2. {  
  3. public static void main(String[] args)   
  4. {  
  5. System.out.println(“List of odd numbers: “);       
  6. //method calling  
  7. displayOddNumbers(1, 100);   
  8. }   
  9. //method that checks the number is odd or not  
  10. private static void displayOddNumbers(int number, int end)   
  11. {   
  12. if(number>end)   
  13. return;   
  14. if(number%2!=0)   
  15. {   
  16. //prints the odd numbers  
  17. System.out.print(number +” “);   
  18. //calling the method and increments the number by 2 if the number is odd  
  19. displayOddNumbers(number + 2, end);   
  20. }   
  21. else   
  22. {   
  23. //increments the number by 1 if the number is odd  
  24. displayOddNumbers(number + 1, end);   
  25. }   
  26. }   
  27. }  

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

  1. import java.util.Scanner;  
  2. public class DisplayOddNumbersExample3  
  3. {  
  4. public static void main(String[] args)   
  5. {  
  6. int number, i;  
  7. Scanner sc=new Scanner(System.in);  
  8. System.out.print(“Enter the limit: “);  
  9. number = sc.nextInt();    
  10. i=1;   
  11. System.out.print(“Lit of odd numbers: “);  
  12. //the while loop executes until the cond\ition become false  
  13. while(i<=number)  
  14. {  
  15. //prints the odd number  
  16. System.out.print(i +” “);   
  17. //increments the variable i by 2  
  18. i=i+2;  
  19. }     
  20. }  
  21. }  

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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