Question

A java program

Write a program that prompts for and reads in a positive
   integer into a variable n. Your program should then sum
   the first n ODD integers and display the sum. For
   example, if 3 is entered for n, your program should display
   the the sum 1 + 3 + 5. If 5 is entered, your program should
   display the sum 1 + 3 + 5 + 7 + 9. What is the relation
   between the number entered and the number displayed.

Answer 1

import java.util.Scanner;

public class sumOdd{

public static void main(String[] args)

{

/* Scanner class to take input from user */

Scanner input = new Scanner(System.in);

System.out.println("Enter an integer: ");

int number = input.nextInt(); // Input from user

/* Logic of Sum of odd number */

int add = 0, val = 1;

for (int i = 0; i < number; i++) {

add = add + val;

val= val +2;

}  

System.out.println("Addition is "+ add);

}

}

/* When you entered Number, The output of program is square of that number. */