(JAVA) Bài 7: Lệnh lặp FOR

package LapFor_01;
import java.util.Scanner;

public class LapFor_01 {

public static void main(String[] args) {
System.out.print("CHUONG TRINH TINH TONG CAC SO NGUYEN DAU TIEN ");
int n,  Tong = 0;

Scanner nhap = new Scanner(System.in);
System.out.print("Nhap so nguyen n: ");
n = nhap.nextInt();

for (int i = 1; i <= n; i++) 
Tong = Tong + i;

System.out.println("Tong cac so nguyen tu 1 den n : " + Tong);
System.out.println("------------------------------------------------");