想要找出我的分数到十进制转换器在Java中出了什么问题

Question

I am doing a project for class and I just wanted to find out what is wrong with my converter from fractions to decimal values? And it has to be done with methods.

import java.util.Scanner;

public class Fraction
{
    public static void main(String args[])
    {
        Scanner input = new Scanner( System.in );

        int numerator, int denominator, result;
        System.out.println ( "Please enter the numerator: " );
        num = input.nextInt();
        System.out.println ( "Please enter the denominator: " );
        den = input.nextInt();
        result = double(numerator/denominator);
    }

    public static int double( int x )
    {
        if (denominator == 0){
            System.out.println ( "Can't divide by zero" );
        }
        else {
            double fraction = (double)numerator / denominator;
            System.out.println(fraction);
        }
    }
}

Answer 1

try this:

    import java.util.*;

    public class Fraction  {
          method();

        }
    public void method () {
            Scanner sc = new Scanner (System.in);

            System.out.println("Please enter the numerator: ");
            double numerator = sc.nextInt();
            System.out.println("Please enter the Denominator: ");
            double denominator = sc.nextInt();
            if (denominator == 0) {
                System.out.println("Can't divide by zero");
            }
            else {
                double fraction = (double)numerator / denominator;
                System.out.println(fraction);
            }
    }

Try this, instead of your code:

import java.util.Scanner;

public class Fraction
{
    public static void main(String args[])
    {
        Scanner input = new Scanner( System.in );

        int numerator, int denominator, result;
        System.out.println ( "Please enter the numerator: " );
        num = input.nextInt();
        System.out.println ( "Please enter the denominator: " );
        den = input.nextInt();
        result = double(numerator/denominator);
    }

    public static int doublenumber( int x ) // you can't use double only because it is reserved word in java.
    {
        if (denominator == 0){
            System.out.println ( "Can't divide by zero" );
        }
        else {
            double fraction = (double)numerator / denominator;
            System.out.println(fraction);
        }
    }
}

Answer 2

This should work:

public static void main(String args[])
{
    Scanner input = new Scanner( System.in );

    int num, den;
    System.out.println ( "Please enter the numerator: " );
    num = input.nextInt();
    System.out.println ( "Please enter the denominator: " );
    den = input.nextInt();
    if (den != 0 ){
    System.out.println ("Decimal is " + convert (num, den));
    }
    else 
    System.out.println ("Cant divide by zero");       

}

public static double convert(int x, int y)
{        
        return ((double)x/y);        
}