How to Return two integer

Question

In this simple program i cant return 2 integer values , can you help me ? How can i do ?

public class Aritmetica 
{

public static int div(int x , int y)

  { 

    int q = 0 ;
    int r = x ; 
    while ( r >= y ) 
    {
      r = r - y ;  
      q = q + 1 ;  

    }
    return r && q; **// Here i want to return x and y**
 }

public static void main(String[ ] args)
 {

 if ( ( x <=0 ) & ( y > 0 ) )

  throw new IllegalArgumentException ( " X & Y must be >0  " ) ;

  int res4= div(x,y);

  System.out.println( " q and r : "+ res4) ; **// and here i want to display q and r** 

}

}

aioobe · Accepted Answer · 2014-11-02 18:52:51Z

5

Create a result type: DivisionResult, as follows:

class DivisionResult {
    public final int quotient;
    public final int remaineder;
    public DivisionResult(int quotient, int remainder) {
        this.quotient = quotient;
        this.remainder = remainder;
    }
}

and do

    ...
    return new DivisionResult(q, r);
}

And to print the result:

  DivisionResult res4= div(x,y);

  System.out.println("q and r: " + res4.quotient + ", " + res4.remainder);

edited Nov 2, 2014 at 18:52

answered Nov 2, 2014 at 18:46

aioobe

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Comments

Amy · Accepted Answer · 2014-11-02 19:04:15Z

0

Instead of returning two integers at once, you can write separate methods for each operation. For example:

public static int div1(int x , int y) { 

// i replaced r with x for readibility
   while ( x >= y ) {
       x = x - y ;  
   }
   return x; // this is your variable r
}

public static int div2(int x, int y) {
    int q = 0;
    int r = x;
    while ( r >= y ) {
        r = r - y ;  // r is required here because it is your update statement in while loop
        q = q + 1 ;  
    }
    return q;
}

In your main method, all you have to is call each method (div1 and div2 to get variables r and q, respectively). You can then print them with a statement like:

System.out.println( " q and r : "+ div2(x,y) + " and " + div1(x,y)) ;

I hope this is simple enough to understand. Good luck!

answered Nov 2, 2014 at 19:04

Amy

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1 Comment

Alpha Over a year ago

Thank you very much ! It works ! And it is very simple , because i started to study java for 2 weeks, and im quite noob ;)

Vikas Verma · Accepted Answer · 2014-11-02 18:50:25Z

0

Use array of integers to return more than one integers.

Like :

public int[] method() {  
    int[] a = {1,2,3,4,5};  
    return a;   
}

edited Nov 2, 2014 at 18:50

answered Nov 2, 2014 at 18:45

Vikas Verma

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4 Comments

Alpha Over a year ago

At school we havent't studied arrays yet , so i cant fo that

aioobe Over a year ago

I don't think this is good practice. result[1] simply isn't as readable as result.remainder.

Vikas Verma Over a year ago

@aioobe What about that result[REMAINDER]

aioobe Over a year ago

@VikasVerma, almost worse. REMAINDER could be confused with the variable containing the actual remainder. REMAINDER_INDEX is slighly better, but still a lot worse than creating a DivisionResult class and do result.remainder.

Mujtaba Hasan · Accepted Answer · 2014-11-02 19:05:57Z

0

Assume q and r are less than p(can be any integer greater than q and r)

Now Do it like this

return result=q*p+r

Now, in main when you want to print the result

print q=result/p
r=result-p*q

edited Nov 2, 2014 at 19:05

answered Nov 2, 2014 at 18:56

Mujtaba Hasan

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4 Comments

kiwixz Over a year ago

It's probably not the best practice but it's kinda fun :)

Alpha Over a year ago

i have only to use + and - for doing the division , but ty aniway , seem it works ;)

Mujtaba Hasan Over a year ago

Ya.. It's the usage of modulo arithmetic. Why can't you use multiplication and division. Is it a puzzle or programming exercise. I am sure they would like if you give different solutions

Alpha Over a year ago

Because i have to write some while programs using Peano's Axioms

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