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@peter279k peter279k/JPA04.java
Created May 24, 2017

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TQC+ JAVA
import java.util.Scanner;
public class JPA03 {
static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args) {
System.out.print("Input the number n: ");
int num = keyboard.nextInt();
System.out.println("Ans: " + sum2(num));
}
public static int sum2(int num) {
if(num < 1) {
return 0;
}
if(num == 1) {
return 2;
}
return sum2(num - 1) + 2 * num;
}
}
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