# Java Program to calculate sum of ODD numbers till N

Get input n and calculate the sum of odd numbers till n

Sample Input 1:

5

Sample Output 1:

The Sum Of odd Number Till N:9(1+3+5)

#### 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(); System.out.println("The N Odd Numbers: "); for(i=1;i<=N;i+=2) { sum=sum+i; } System.out.println("The Sum Of N Odd Numbers: "+sum); } } ```

#### Program Explanation

1. Get input N (To which odd numbers to be added)

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

for(i=1;i<N;i+=2)

3. Here i is initialized to 1 and incremented by 2 for each iteration, instructions inside the for block are executed      in every iteration. iteration stops when i becomes greater than n.

so value of i (1,3,5,...n)will be added to sum.

sum = sum + i

sum = 0 + 1

sum = 1 + 3

sum =  4 + 5

...................

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