Lab Recursive Method

package s9325116;


import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class recursion {
public static void main(String[] args)throws IOException
{ BufferedReader keyboard=new BufferedReader(new InputStreamReader(System.in));
int b=Integer.parseInt(keyboard.readLine());
int c=recursive(b);
System.out.println(c);
}

public static int recursive(int n)
{
if(n==1)
return 1;
else
return recursive(n-1)+n*n;
}
}

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執行結果

222
3671695