package test;import java.util.*;public class Test { public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("输入一个正整数:");
int n = sc.nextInt();
System.out.println(fan(n));
}
public static int fan(int n){
if(n==1){
return 1;
}else{
return n=n+fan(n-1);
}
}
}
Scanner sc = new Scanner(System.in);
System.out.println("输入一个正整数:");
int n = sc.nextInt();
System.out.println(fan(n));
}
public static int fan(int n){
if(n==1){
return 1;
}else{
return n=n+fan(n-1);
}
}
}
if(n==1){
return 1;
}else{
return n=n+fan(n-1);
}
}
Scanner sc = new Scanner(System.in);
System.out.println("输入一个正整数:");
int n = sc.nextInt();
int sum=0;
while(n>=0){
sum=sum+fan(n);
n--;
}
System.out.println(sum);
}
public static int fan(int n){
if(n==1){
return 1;
}
else{
return n;
}
}