三角数字
package Triangle;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class Triangle {static int theNmber;/** * @param args */public static void main(String[] args) throws IOException{// TODO Auto-generated method stubSystem.out.println("Enter a number: ");theNmber = getInt();int theAnswer = triangle(theNmber);System.out.println("Triangle = :" + theAnswer);}public static int triangle(int n) {// TODO Auto-generated method stubif(n == 1) {return 1;}else{//System.out.print(n);return (n + triangle(n-1));}}public static int getInt() throws IOException {// TODO Auto-generated method stubString s = getString();return Integer.parseInt(s);}public static String getString() throws IOException {// TODO Auto-generated method stubInputStreamReader isr = new InputStreamReader(System.in);BufferedReader br = new BufferedReader(isr);String s = br.readLine();return s;}}
