java - 如何用数组进行减法/除法

Question

//Declare and intialize variables - programmer to provide initial values
    Scanner in = new Scanner(System.in);
    String city = "Daytona Beach";
    String state = "Florida";
    double a =0;

    String month [] ={"Jan", "Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
    double temperature [] = {58.4, 60.0, 64.7, 68.9,74.8, 79.7, 81.7, 81.5,79.9,74.0,67.0,60.8};        
    double precipitation [] ={3.1, 2.7,3.8,2.5,3.3,5.7,5.2,6.1,6.6,4.5,3.0,2.7};    
    String tempLabel = "F";   //initialize to F
    String precipLabel = "inch"; //initialize to inch

    double c [] = {32.0};
    double q [] = {0.5555};

    //INPUT - ask user for temp and preciptation scale choice
    System.out.print("Choose the temperature scale (F = Fahrenheit, C = Celsius): ");
    String tempChoice = in.next();
    System.out.print("Choose the precipitation scale (i = inches, c = centimeteres): ");
    String precipChoice = in.next();


    //PROCESSING - convert from F to C and in to cm based on user's choices

    // remember 5/9 = 0, 5.0/9 = .5555

    if(tempChoice.equalsIgnoreCase("C"))
    {
        tempLabel="(C)";


        for( int index = 0; index < temperature.length; index++)
        {

        }

    }

    //Convert in values to cm; replace the current values in precipitation
    if(precipChoice.equalsIgnoreCase("c"))
    {
        precipLabel="(cm)";


    }

    //OUTPUT - print table using printf to format and align data

    System.out.println();
    System.out.println("Climate Data");
    System.out.println("Location: " + city +", " + state);
    System.out.printf("%5s %18s %s %18s %s","Month","Temperature",tempLabel,"Precipitation",precipLabel);
    System.out.printf("***************************************************");
    System.out.printf("%s\n",month);
    System.out.println();
    System.out.printf("***************************************************");
    System.out.println();

不用担心降水量的转换。如何转换多个数组值(以华氏度为单位)？我尝试这样做(例如):a[i] = b[i]-c[i]，但总是出现关闭温度数组的错误。错误是“预期的‘]’。

** 我还收到编译器警告“上次编译的警告:

• 非可变参数调用最后一个参数类型不精确的可变参数周长；

• 转换为 java.lang.Object 以进行可变参数调用

• 强制转换为 java.lang.Object[] 以进行非可变参数调用并抑制警告

Answer 1

如果您在示例中引用的 a 是您声明的 double a，那么这是因为 a 不是数组。

此外，c 和 q 很可能是普通的 double 而不是数组