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Java: Display n terms of natural numbers and their sum

Java Conditional Statement: Exercise-11 with Solution

Write a Java program to display n terms of natural numbers and their sum.

Test Data
Input number: 7

Pictorial Presentation:

Java conditional statement Exercises: Display n terms of natural numbers and their sum

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise11 {

    
  public static void main(String[] args)

{
   int i, n, sum=0;
   {
   Scanner in = new Scanner(System.in);  
        System.out.print("Input number: ");  
         n = in.nextInt();
}
  System.out.println("The first n natural numbers are : "+n);
  
 for(i=1;i<=n;i++)
   {
     System.out.println(i);
     sum+=i;
   }
System.out.println("The Sum of Natural Number upto "+n+ " terms : " +sum);

}
}

Sample Output:

Input number: 7                                                                                               
The first n natural numbers are : 7                                                                           
1                                                                                                     
2                                                                                                     
3                                                                                                     
4                                                                                                     
5                                                                                                     
6                                                                                                     
7                                                                                                     
The Sum of Natural Number upto n terms : 28   

Flowchart:

Flowchart: Java Conditional Statement Exercises - Display n terms of natural numbers and their sum

Java Code Editor:

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Previous: Write a program in Java to display the first 10 natural numbers.
Next: Write a program in Java to input 5 numbers from keyboard and find their sum and average.

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Java: Tips of the Day

IsPowerOfTwo

Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);
}

Ref: https://bit.ly/3sA5d4I

 





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