如果方法中的return语句不符合要求，该如何在Java中执行while循环？

Question

import java.util.Scanner;
public class MethHead
{

    public static int calMe(int a, int b)
    {
        int sum=a+b;
        return sum;

    }

    public static void main(String[] args) 
    { 
       do
       {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter two numbers to add");
        System.out.println("a: ");
        int a=input.nextInt();
        System.out.println("b: ");
        int b=input.nextInt();
        int sum=calMe(a, b);
        }   
        while(sum!=2);
    }
}

Ok, stupid question, but alwell. I keep getting

cannot find symbol- variable sum

I'm trying to figure out how to position a loop to continue the program if a certain value is returned from the method.

Thank you in advance!

Answer 1

declare variable sum outside the loop

int sum; 
       do
       {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter two numbers to add");
        System.out.println("a: ");
        int a=input.nextInt();
        System.out.println("b: ");
        int b=input.nextInt();
        sum= calMe(a, b);
        }   
        while(sum!=2);

Answer 2

import java.util.Scanner; public class MethHead {

public static int calMe(int a, int b)
{
    int sum=a+b;
    return sum;

}

public static void main(String[] args) 
{ 
    int sum;
   do
   {
    Scanner input=new Scanner(System.in);
    System.out.println("Enter two numbers to add");
    System.out.println("a: ");
    int a=input.nextInt();
    System.out.println("b: ");
    int b=input.nextInt();
    sum=calMe(a, b);
    }   
    while(sum!=2);
}

}

How I fixed it... just in case anyone ever comes across the same problem.