1-100的递归累加

 1 public class DiGui {
 2     public static void main(String[] args) {
 3         DiGui diGui = new DiGui();
 4             System.out.println(diGui.add(1));            
 5     public int add(int sum){
 6         if(sum == 100){
 7             return 100;
 8         }else{
 9             return sum+add(sum+1);       //无限循环到+100
10         }
11     }