Created
May 24, 2017 15:49
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TQC+ JAVA
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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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