import java.util.Scanner```java

import java.util.Scanner;

public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入一个正整数n"); int n = sc.nextInt(); int sum = 0; if (n>=1&&n<=100) { for (int i = 1; i <= n; i++) { sum += i; } } System.out.println(sum); } }package qiuhe;

import java.util.Scanner;

public class qiuhe { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入一个正整数n"); int n = sc.nextInt(); int sum = 0; if (n>0&&n<=100) { for (int i = 1; i <= n; i++) { sum += i; } } System.out.println(sum); } }

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个正整数n");
        int n = sc.nextInt();
        int sum = 0;
        if (n>=1&&n<=100) {
            for (int i = 1; i <= n; i++) {
                sum += i;
            }
        }
        System.out.println(sum);
    }
}