Java中的温度转换代码无法运行？

Question

Ok,so I'm a complete novice at programming and I just started coding in Java. I tried to write a code for temperature conversion (Celsius to Fahrenheit) and for some reason it simply won't run! Please, help me find out errors in this code(however silly it may be).

Here's the code:

  package tempConvert;

  import java.util.Scanner;

  public class StartCode {

      Scanner in = new Scanner(System. in );

      public double tempInFarenheit;

      public double tempInCelcius;

      {
          System.out.println("enter the temp in celcius");

          tempInCelcius = in .nextDouble();

          tempInFarenheit = (9 / 5) * (tempInCelcius + 32);

          System.out.println(tempInFarenheit);
      }
  }

Answer 1

You forgot to write the main method which is the start point for a program to run. Let me modify your code.

import java.util.Scanner;

public class StartCode 
{
    Scanner in = new Scanner (System.in); 
    public double tempInFarenheit;
    public double  tempInCelcius;

public static void main (String[] args)

    {
        System.out.println("enter the temp in celcius");

        tempInCelcius = in.nextDouble() ;    
        tempInFarenheit = (9/5)*(tempInCelcius+32);

        System.out.println(tempInFarenheit);
    } 
}

Answer 2

I think this is going to work better for you:

import java.util.Scanner;

public class StartCode
{
    public static void main(String[] args) {
        Scanner in = new Scanner (System.in);
        double tempInFarenheit;
        double  tempInCelcius;
        System.out.println("enter the temp in celcius");
        tempInCelcius = in.nextDouble() ;
        tempInFarenheit = 1.8*tempInCelcius+32;
        System.out.println(tempInFarenheit);
    }
}

You equation for Farenheit was incorrect. Integer division isn't for you, either.

Answer 3

You need a main method . I also suggest using an IDE such as Eclipse, which can generate the skeleton code for you (including the syntax of the main method).

Answer 4

import java.util.*;
public class DegreeToFahrenheit {


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

        System.out.println("Enter a temperature: ");  
        double temperature = input.nextDouble();  
        System.out.println("Enter the letter of the temperature type. Ex: C or c for celsius, F or f for fahrenheit.: ");  

        String tempType = input.next();  


        String C = tempType;  
        String c = tempType;  

        String F = tempType;  
        String f = tempType;  

        double celsius = temperature;  
        double fahrenheit = temperature;  

        if(tempType.equals(C) || tempType.equals(c)) { 
            celsius = (5*(fahrenheit-32)/9);  
            System.out.print("The fahrenheit degree " + fahrenheit + " is " + celsius + " in celsius." );


        }  


        else if(tempType.equals(F) || tempType.equals(f)) {  

            fahrenheit = (9*(celsius/5)+32);  
            System.out.print("The celsius degree " + celsius + " is " + fahrenheit + " in fahrenheit." ); 
        }  

        else {  
            System.out.print("The temperature type is not recognized." );  
        }  
    }  

}