Question

我目前正在编写一个将整数转换为罗马数字的代码。我试图创建一个方法，将int的每个数字分配给十分之一或千分之一并将其转换为字符串，然后将字符串一起添加以获得最终的罗马数字字符串。但是我发现有问题，当我尝试为字符串赋值时它不允许我。这是代码，建议会很棒。

编辑 - 我试图稍微清理一下语法，更新了我的语法。我现在的主要问题是编译器声明字符串赋值是重复的，任何建议如何解决？

private static String ConverttoNumerals (int newinteger){
   String Roman = "";
   int number = newinteger;
   int ones = number % 10;
   if (ones == 1){String Roman = "I";}
   else if ( ones == 2){String Roman = "II";}
   else if (ones == 3){String Roman = "III";}
   else if (ones == 4){String Roman = "IV";}
   else if (ones == 5){String Roman = "V";}
   else if (ones == 6){String Roman = "VI";}
   else if (ones == 7){String Roman = "VII";}
   else if (ones == 8 ){String Roman = "VII";}
   else if (ones == 9){String Roman = "IX";}
   else if (ones == 0){String Roman = "";
   int tenths = ((number / 10) % 10);
   String Romant="";
   if (tenths == 1){String Romant = "X";}
   else if (tenths == 2){String Romant = "XX";}
   else if (tenths == 3){String Romant = "XXX";}
   else if (tenths == 4){String Romant = "XL";}
   else if (tenths == 5){String Romant = "L";}
   else if (tenths == 6){String Romant = "LX";}
   else if (tenths == 7){String Romant = "LXX";}
   else if (tenths == 8 ){String Romant = "LXXX";}
   else if (tenths == 9){String Romant = "XC";}

Answer 1

您可以尝试使用一些String数组..可以进一步缩短并使用二维数组放入循环

public class Roman {
private static final String[] units =     {"", "I","II","III","IV","V","VI","VII","VIII","IX"};
private static final String[] tens  =     {"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
private static final String[] hundreds =  {"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"};
private static final String[] thousands = {"","M","MM","MMM"};

public static String ConverttoNumerals (int newinteger){
    int n = newinteger;
    int digit = n/1000;
    String result = thousands[digit];

    n = n - digit*1000;
    digit = n/100;
    result = result + hundreds[digit];

    n = n -digit*100;
    digit = n/10;
    result = result + tens[digit];

    n = n - digit*10;
    result = result + units[digit];

    return result;

}
}

Answer 2

三件事：

字符串文字必须在引号中：String roman = "IX";
语句需要以分号结尾（;）
您应该使用switch statement

Answer 3

    public class Test {
    public static void main(String[] args) {
        System.out.println(ConverttoNumerals(53));
    }
    private static String ConverttoNumerals (int newinteger){
        String Roman = "";
        String Romant="";
        String Romanh = "";
        String Romanq = "";
        int number = newinteger;
        int ones = number % 10;
        if (ones == 1){ Roman = "I";}
        else if ( ones == 2){ Roman = "II";}
        else if (ones == 3){ Roman = "III";}
        else if (ones == 4){ Roman = "IV";}
        else if (ones == 5){ Roman = "V";}
        else if (ones == 6){ Roman = "VI";}
        else if (ones == 7){ Roman = "VII";}
        else if (ones == 8 ){ Roman = "VII";}
        else if (ones == 9){ Roman = "IX";}
        else if (ones == 0){ Roman = ""; }
        int tenths = ((number / 10) % 10);

        if (tenths == 1){ Romant = "X";}
        else if (tenths == 2){ Romant = "XX";}
        else if (tenths == 3){ Romant = "XXX";}
        else if (tenths == 4){ Romant = "XL";}
        else if (tenths == 5){ Romant = "L";}
        else if (tenths == 6){ Romant = "LX";}
        else if (tenths == 7){ Romant = "LXX";}
        else if (tenths == 8 ){ Romant = "LXXX";}
        else if (tenths == 9){ Romant = "XC";}
        int hundredths = ((number/100)%10)  ;
        if (hundredths == 1){ Romanh = "C";}
        else if (hundredths == 2){ Romanh = "CC";}
        else if (hundredths == 3){ Romanh = "CCC";}
        else if (hundredths == 4){ Romanh = "CD";}
        else if (hundredths == 5){ Romanh = "D";}
        else if (hundredths == 6){ Romanh = "DC";}
        else if (hundredths == 7){ Romanh = "DCC";}
        else if (hundredths == 8){ Romanh = "DCCC";}
        else if (hundredths == 9){ Romanh = "CM";}
        int thousandth = ((number/1000)%10);
        if (thousandth == 1){ Romanq = "M";}
        else if (thousandth == 2){ Romanq = "MM";}
        else if (thousandth == 3){ Romanq = "MMMM";}
        return  Romanq+Romanh+Romant+Roman;

    }
}

使用java编程时，请使用命名约定。我没有在这个程序中使用，因为我懒得编辑所有这些。 :-P

在Private方法中分配字符串

3 个答案: