Question

我的代码在这里是一个混乱我知道，但我与我的逻辑混淆，需要帮助尝试将它们组合在一起。所以任何帮助都表示赞赏。我希望输出为＃34;

转换工具

1.Gallons to升

升加仑
茶匙到毫升
Milliliters to teaspoons

请选择您要制作的转化类型：1

请输入加仑：5

总升数为18.925＆＃34;

import java.util.Scanner;
public class ConversionProgram {

public static final double LT_TO_GAL = .274;   
public static final double GAL_TO_LT = 3.785;        
public static final double TSP_TO_ML = 4.9289;
public static final double ML_TO_TSP = .202;


public static void main(String[] args) {
    int nInitLit = 0;                       
    int nInitGal = 0;                       
    int nTotalLit = 0;
    double dResult = 0;
    double dNumber1 = 0;
    double dNumber2 = 0;
    int nPrice = 0;
    double dTotalGal = 0.0;             
    Scanner input = new Scanner(System.in); 

    System.out.println("CONVERSION TOOL: ");   
    System.out.println("1. Gallons to liters ");
    System.out.println("2. Liters to gallons");
    System.out.println("3. Teaspoons to milliliters");
    System.out.println("4. Milliliters to teaspoons");
    System.out.print("");

    System.out.print("Please select the type of conversion you would like to make: ");
        int nConversion = input.nextInt();

    if (nConversion == 1) {        
        System.out.print("Please enter the gallons: ");
        double dGal = input.nextDouble();

    }

        else if (nConversion == 2) {
            System.out.print("Please enter the total liters: ");               
            double dLit = input.nextDouble();
        }

        else if (nConversion == 3 ) {
            System.out.print("Please enter the total teaspoons ");
            double dTsp = input.nextDouble();           
        }

        else if (nConversion == 4 ) {
            System.out.print("Please enter the total milliliters ");
            double dMil = input.nextDouble();               
        }


} //end main method

public static double calculateGallonsToLiters(double dGal) {
    double dTotGal = 0;                  
    dTotGal = dGal * GAL_TO_LT;
        return dTotGal;
    } 



public static double calculateLitersToGallons(double dLit){

    double dTotLt = 0;              
    dTotLt = dLit * LT_TO_GAL;
        return dTotLt;
    } //end


public static double calculateTeaspoonsToMliters(double dMlit){

    double dTotMl = 0;              
    dTotMl = dMlit * TSP_TO_ML;
        return dTotMl;
    } //end


public static double calculateMlitersToTeaspoons(double dTsp){
    double dTotTsp = 0;             
    dTotTsp = dTsp * ML_TO_TSP;
        return dTotTsp;
    } //end


public static void printResult(int nOpt, int nResultOperation){
        System.out.println("The total gallons is : " + nResultOperation);

    }//end method printResult} //end class

Answer 1

您还需要调用转换方法。变化

public static void printResult(int nOpt, int nResultOperation){
    System.out.println("The total gallons is : " + nResultOperation);
}

到

public static void printResult(String unit, double result){
   System.out.println("The total " + unit + " is : " + result);
}

和

if (nConversion == 1) {        
    System.out.print("Please enter the gallons: ");
    double dGal = input.nextDouble();
}

到

if (nConversion == 1) {        
    System.out.print("Please enter the gallons: ");
    double dGal = input.nextDouble();
    double litres = calculateGallonsToLiters(dGal);
    printResult("litres", litres);
}

Answer 2

除了Aidin给出的正确答案之外，我想建议使用switch语句而不是if / else并删除所有不需要的变量，并且不重要使代码可读：

import java.util.Scanner;
public class ConversionProgram {

    public static final double LT_TO_GAL = .274;   
    public static final double GAL_TO_LT = 3.785;        
    public static final double TSP_TO_ML = 4.9289;
    public static final double ML_TO_TSP = .202;


    public static void main(String[] args) {

        Scanner input = new Scanner(System.in); 

        System.out.println("CONVERSION TOOL: ");   
        System.out.println("1. Gallons to liters ");
        System.out.println("2. Liters to gallons");
        System.out.println("3. Teaspoons to milliliters");
        System.out.println("4. Milliliters to teaspoons");
        System.out.print("");

        System.out.print("Please select the type of conversion you would like to make: ");
        int nConversion = input.nextInt();

        switch (nConversion){
            case 1:
                System.out.print("Please enter the gallons: ");
                printResult("liters",calculateGallonsToLiters(input.nextDouble()));
                break;
            case 2:
                System.out.print("Please enter the total liters: ");
                printResult("gallons",calculateLitersToGallons(input.nextDouble()));
                break;
            case 3:
                System.out.print("Please enter the total teaspoons ");
                printResult("milliliters",calculateTeaspoonsToMliters(input.nextDouble()));
                break;
            case 4:
                System.out.print("Please enter the total milliliters ");
                printResult("teaspoons",calculateTeaspoonsToMliters(input.nextDouble()));
                break; 
            default:
                System.out.println("Not a valid option!");       
        }   
    }

    public static double calculateGallonsToLiters(double dGal) {
       return dGal * GAL_TO_LT;
    } 

    public static double calculateLitersToGallons(double dLit){
        return dLit * LT_TO_GAL;
    } 

    public static double calculateTeaspoonsToMliters(double dMlit){
        return dMlit * TSP_TO_ML;
    }

    public static double calculateMlitersToTeaspoons(double dTsp){
        return dTsp * ML_TO_TSP;
    }

    public static void printResult(String nOpt, double nResultOperation){
        System.out.println("The total " + nOpt + " is : " + nResultOperation);
    }
}

我正在尝试使用方法转换多个指标，而且我被困住了，我不知道接下来该做什么？

2 个答案: