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Thread: Negative

  1. #1
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    Default Negative

    for some reason when i run my code for fahrenheit to celcius and vise versa when the formula becomes negative it just shows up 0

    here is my code

    code
    import java.util.Scanner;
    import java.util.Random;
     
    public class tempature
    {
    	public static void main(String[] args)
    	{
    	Scanner scan = new Scanner(System.in);
    	Random random = new Random();
     
    		double c;
    		double f;
    		int x;
     
    		System.out.println("Do you want Celcius(1) or Fahrenheit(2)");
    		x = scan.nextInt();
     
     
    		if (x == 1){
    		System.out.println("type the tempature in Celcius.");
    		c = scan.nextInt();
     
    		f = (c * 9 / 5 + 32);
     
    		System.out.println("Your Fahrenheit tempature is " + f);
    		}
    		else
    {		System.out.println("type the tempature in Fahrenheit.");
    		c = scan.nextInt();
     
    		f = ((c - 32) * (5 / 9));
     
    		System.out.println("Your Celsius tempature is " + f);
     
    	}
     
    	}
    }
    Last edited by helloworld922; March 6th, 2011 at 07:23 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Negative

    The problem is because you're code is using integer math, not floating point math. Try:

    import java.util.Scanner;
    import java.util.Random;
     
    public class tempature
    {
    	public static void main(String[] args)
    	{
    	Scanner scan = new Scanner(System.in);
    	Random random = new Random();
     
    		double c;
    		double f;
    		int x;
     
    		System.out.println("Do you want Celcius(1) or Fahrenheit(2)");
    		x = scan.nextInt();
     
     
    		if (x == 1){
    		System.out.println("type the tempature in Celcius.");
    		c = scan.nextInt();
     
    		f = (c * 9. / 5. + 32); // need the dot to tell java to treat this number as a floating point constant 
    		System.out.println("Your Fahrenheit tempature is " + f);
    		}
    		else
    {		System.out.println("type the tempature in Fahrenheit.");
    		c = scan.nextInt();
     
    		f = ((c - 32) * (5. / 9.)); // need the dot to tell java to treat this number as a floating point constant 
    		System.out.println("Your Celsius tempature is " + f);
     
    	}
     
    	}
    }

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