不使用 break 结束循环并将 for 循环转换为 while

Question

this is my code

import java.util.*;
public class test3
{
    public static void main (String [] args)
    {
        int sum = 0;
        int mark;
        Scanner sc = new Scanner(System.in);
        for (int student = 1; student <=10; student++)
        {
            System.out.println("enter mark");
            mark = sc.nextInt();
            if (mark > 0)
            {
                sum = sum + mark;
            }
            else
            {
                student = 10;
            }
        }
        System.out.println("sum is" + sum);

    }
}

i want to change this code so that the loop ends without having to use student = 10 to end loop. i cant think of anything that would end the loop. and also convert it to a while loop so far i have

int student = 1 ;
int sum = 0;
int mark
Scanner sc = new Scanner(System.in);

    while (student <= 10)
    {
        System.out.println("enter mark");
        mark = sc.nextInt();
        sum = sum  + mark;
        student++;
    }

but i dont know how to end loop if 0 is input we're not allowed to use break; to exit loop could i get some help please?

Answer 1

The ways for ending loops are:

• using break
• if the condition is not satisfied in the next interation
• Including the loop in a method and using return

Answer 2

Use while (student <= 10) condition and student = 10 statement to exit the loop:

public static void main(String[] args) {
    int sum = 0;
    int mark;
    Scanner sc = new Scanner(System.in);
    int student = 1;
    while (student <= 10) {
        System.out.println("enter mark");
        mark = sc.nextInt();
        if (mark > 0) {
            sum = sum + mark;
        } else {
            student = 10;
        }
        student++;
    }
    System.out.println("sum is" + sum);
}

Answer 3

What about this:

int student = 1 ;
int sum = 0;
int mark
Scanner sc = new Scanner(System.in);

while (student <= 10) {
    System.out.println("enter mark: ");
    mark = sc.nextInt();
    if (mark > 0) {
        sum += mark;
    } else {
        student = 10;
    }
    student++;
}
System.out.println("sum is = " + sum);