Add numbers with java function

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Code that should add numbers from user is: if function is added in main function then it adds however not as different function as the code here shows

public class AddVariation
{
    
    public static void main(String[] args) 
    {
        AddNumbers(C,D);        
    }
    
    private static int AddNumbers(int C, int D)
    {
        Scanner Num = new Scanner(System.in);
        System.out.print("Number C :");
        while(!Num.hasNextInt()) Num.next();
        C = Num.nextInt();           
        
        System.out.print("Number D :");
        while(!Num.hasNextInt()) Num.next();
        D = Num.nextInt();   
        
        return (C+D);        
    }
}

What I have tried:

Java code , java classes and Mathematical functions

Posted 20-May-18 2:23am

four systems

Updated 22-May-18 5:28am

v2

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Richard MacCutchan · Answer 1 · 2018-05-20T02:47:00

Solution 1

Your code is incorrect. You are trying to call AddNumbers with two parameters (C and D), but you have not defined theses variables. And since the AddNumbers method tries to read the values from the console it makes no sense. You need to declare your two number variables inside the method that will be using them. And finally in main you need to save the returned value and do something with it, e.g. print it on the console.

Posted 20-May-18 2:47am

Richard MacCutchan

Comments

four systems 20-May-18 9:36am

does that means parametrized methods cant be called from main method

Richard MacCutchan 20-May-18 11:23am

No, it does not mean that. But your code does not need it because you are not sending any values to the AddNumbers method. You need to study your Java notes to see when and how to use parameters correctly.

Richard MacCutchan 20-May-18 11:25am

See also the comments in my answer to your question at Code ! does changes variables dynamically[^].

four systems 20-May-18 11:43am

yeah understand that now TY

four systems 20-May-18 11:46am

how do you pass parameters to functions if you are using netbeans

Richard MacCutchan 20-May-18 12:23pm

The same way as if you are using a pencil and paper. Netbeans is an IDE and nothing to do with the actual Java code of your program.

four systems · Answer 2 · 2018-05-22T05:29:00

Did it another way it adds now

public class AddVariation
{
    
    public static void main(String[] args) 
    {
           int sum =  AddNumbers();
    }
    
    private static int AddNumbers()
    {
       Scanner Num = new Scanner(System.in);        
        
       System.out.print("Number C :");
       int C = Num.nextInt();
                
       System.out.print("Number D :");
       int D = Num.nextInt();   
        
       System.out.print("Sum is :" + (C + D)); 
       
       return(C+D);
                  
    }
}