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Java Program to print sum of N ODD numbers

Get input n and print n odd numbers.

Sample Input 1:

7

Sample Output 1:

The sum of N Odd numbers:49

Try your Solution

Strongly recommended to Solve it on your own, Don't directly go to the solution given below.

public class Hello { public static void main(String args[]) { //Write your code here } }

Program or Solution

				
			
					
import java.util.*;
class SumOfNOdd
 {
    public static void main(String args[])
    {
       int i,j,N,sum=0;
       System.out.println("Enter The Value Of N");
       Scanner sc=new Scanner(System.in);
       N=sc.nextInt();
       for(j=1,i=1;j<=N;i=i+2,j++)
       {
            sum=sum+i;
       }
        System.out.println("The Sum Of N Odd Numbers: "+sum);
    }
}

Program Explanation

1.    Get input N (How many odd numbers to be summed)

2.     Instruction(s) inside the for block{} are executed repeatedly till the second expression (j<=N) is true.

        for(j=1,i=1;j<=N;i=i+2,j++) 

3.    Here i and j are initialized to 1 and i is incremented by 2 and  j is incremented by 1 for each iteration.

       instructions inside the for block are executed in every iteration and iteration stops when j becomes                       greater than N. so value of i (1,3,5... ) will be added to sum.

        so odd numbers (i) are added to the sum for j --> 1 to N times

        sum = sum + j

        sum = 0 + 1

        sum = 1 + 3

        sum = 4 + 5

        sum = 9 + 7

        ..................

        ..................

        after adding all N odd numbers to sum, sum will be printed using system.out.println()

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