Java: Display the n terms of odd natural number and their sum

Last update on May 14 2025 13:01:05 (UTC/GMT +8 hours)

Sum of Odd Natural Numbers

Write a Java program that displays the sum of n odd natural numbers.

Test Data
Input number of terms is: 5

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise15 {

   public static void main(String[] args)

{
   int i,n,sum=0;

   System.out.print("Input number of terms is: ");
{
   Scanner in = new Scanner(System.in);
		    n = in.nextInt();
  System.out.println ("\nThe odd numbers are :");
   for(i=1;i<=n;i++)

   {
     System.out.println (2*i-1);
     sum+=2*i-1;
   }
   System.out.println ("The Sum of odd Natural Number upto " +n+" terms is: " +sum);

}
}
}

Sample Output:

Input number of terms is: 5                                                                                   
The odd numbers are :                                                                                         
1                                                                                                       
3                                                                                                       
5                                                                                                       
7                                                                                                       
9                                                                                                       
The Sum of odd Natural Number upto 5 terms is: 25

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to compute the sum of the first n odd natural numbers using a mathematical formula.
• Write a Java program to display the first n odd numbers and then compute their cumulative sum using recursion.
• Write a Java program to calculate the sum of odd numbers in an array of natural numbers using streams.
• Write a Java program to prompt the user for n and then display the odd numbers and their sum using a while loop.

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