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Need to create a default constructor that generates 2 random questions. I'm fairly new to programming

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Need to create a default constructor that generates a random question, addition or subtraction. And when adding the numbers must be random from 0-12 and when subtracting the first number must be from 6-12, while the second is less than the first number. Here's my progress as of now: package project4;

public class Question {
private int num1; 
private int num2; 
private char operand;

public Question()
{
    operand = '+';
    num1 = (int)(Math.random())*12;
    num2 = (int)(Math.random())*12;
    int addition = num1 + num2;
    invalid = addition;


    operand = '-';
    num1 = ((int)(Math.random())*12+6);
    num2 = (int)(Math.random()) << num1;
    int subtraction = num1 - num2;
    negative = subtraction;
}

public String toString()
{
    String str = new String(num1 + " " + operand + " " + num2);
    return str;
}

}

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Need to create a default constructor that generates 2 random questions. I'm fairly new to programming sunnyaleem@gmail.com - 2013-04-12 16:11 -0700
  Re: Need to create a default constructor that generates 2 random questions. I'm fairly new to programming Eric Sosman <esosman@comcast-dot-net.invalid> - 2013-04-12 20:26 -0400
  Re: Need to create a default constructor that generates 2 random questions. I'm fairly new to programming Roedy Green <see_website@mindprod.com.invalid> - 2013-04-14 04:07 -0700
    Re: Need to create a default constructor that generates 2 random questions. I'm fairly new to programming "John B. Matthews" <nospam@nospam.invalid> - 2013-04-14 13:30 -0400
      Re: Need to create a default constructor that generates 2 random questions. I'm fairly new to programming markspace <markspace@nospam.nospam> - 2013-04-14 11:57 -0700
        Re: Need to create a default constructor that generates 2 random questions. I'm fairly new to programming Lew <lewbloch@gmail.com> - 2013-04-14 18:48 -0700

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