execution program

[charushila ingale]

hello friends,
i am new in java i have problem in the program

     import java.util.*;

class MathTest
{
  public static void main(String[] az)
   {
       Math m = new Math();

       Scanner in =  new Scanner(System.in);

       System.out.print("Enter value of x: ");       
       int x = in.nextInt();


       System.out.print("Enter value of y : ");
       int y=in.nextInt();

       System.out.println(" x: " +x+ "y :" +y);

       m.add();
       m.sub();

       System.out.println("Addition = "+m.add()+ "Subtraction = " +m.sub());
   }
}

 class Math
{
   public Math(int a,int b)
    {
         x=a;
         y = b;
    }
    
   public int getValue()
    {
       return x;
    }

   public int getVal()
    {
           return y;
    }

   public int add()
    {
         return x+y;
    }

   public int sub()
    {
       return x-y;
    }
    private int x;
    private int y;
}

this is my program but it gives me the answer like this but i want addition numbers which we are entering


E:\charu\java-program>java MathTest
Enter value of x: 2
Enter value of y : 1
x: 2y :1
Addition = 11Subtraction = 3

any one tell me why it is not giving the user input

[Rob Spoor]

Please UseCodeTags. You can use the edit button to add them. And don't forget to keep the indentation within the code tags.

[Jesper de Jong]

Are you sure that your code compiles? It shouldn't, because you are creating a new Math object with: Math m = new Math(); but your class Math does not have a constructor that takes no arguments.

[charushila ingale]

Jesper Young wrote:Are you sure that your code compiles? It shouldn't, because you are creating a new Math object with: Math m = new Math(); but your class Math does not have a constructor that takes no arguments.

i am giving two arguments
7and 4

[Jesper de Jong]

No, you aren't. Look in the source code that you posted above. You have this line in the main() method:

Math m = new Math();

If you try to compile that, you will get a compiler error, because your class Math does not have a constructor that takes no arguments. It only has a constructor that takes two int arguments:

class Math
{
	public Math(int a,int b)
	{
		// ...

I don't see two arguments 7 and 4 being passed in your code above.

Maybe your actual code is different from what you posted above. Are you really doing this?

Math m = new Math(7, 4);

If yes, then why are you surprised at the output? Because 7 + 4 = 11 and 7 - 4 = 3.

[Maneesh Godbole]

Charushila,
Like Rob requested you before, in future, while posting code, please UseCodeTags
I have edited your original post to incorporate them. As you can see it makes the code much more readable and easier to understand.

[charushila ingale]

Jesper Young wrote:No, you aren't. Look in the source code that you posted above. You have this line in the main() method:

Math m = new Math();

If you try to compile that, you will get a compiler error, because your class Math does not have a constructor that takes no arguments. It only has a constructor that takes two int arguments:

class Math
{
	public Math(int a,int b)
	{
		// ...

I don't see two arguments 7 and 4 being passed in your code above.

Maybe your actual code is different from what you posted above. Are you really doing this?

Math m = new Math(7, 4);

If yes, then why are you surprised at the output? Because 7 + 4 = 11 and 7 - 4 = 3.

i am very sorry
my code is different from this
you are true and i want addition of those number which are given by user mean i want addition of number 2 and 3

[Rob Spoor]

charushila ingale wrote:my code is different from this

Please PostRealCode. If you don't post the real code then we can't help you out.

[Jesper de Jong]

charushila ingale wrote:you are true and i want addition of those number which are given by user mean i want addition of number 2 and 3

I guess you want the addition and subtraction to be done with the numbers that the user types in.

What you'll have to do is first input the numbers, and then create the Math object, passing it the numbers you've just gotten from the user (x and y). You'll have to move line 7 of your source code down to around line 19.

Take your time, carefully look at the source code line by line, and make sure that you understand what each line of code is doing exactly - follow the flow of the program, so that you understand what the whole program is doing exactly.

[ahamed irshad]

...

[Maneesh Godbole]

Ahamed,

I am sure you meant well, but please do not post ready made solutions. The best way to learn is by making mistakes and identifying the mistakes.
I hope you appreciate this and take it in the right spirit.