Question

我正在创建一个程序，该程序读取0-999之间的数字，然后以字为单位返回该数字。我已经使用了所有其他数字，但是我不知道如何获取111-119、211-219、311-319等之间的数字，一直到911-919。有人可以帮忙吗？谢谢！

我尝试将numones = number%10;更改为numones = number%100;，但这无法读取所有其他数字，并导致array outofbounds错误。

public static void main(String[] args) {
int numones;
    int numtens;
    int numhundreds;
    String [] ones = {"", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",
        "eleven", "twelve", "thirteen", "fourteen", "fiveteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty"};
    String [] tens = {"","", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};

    System.out.print("Number: ");
    int number = In.nextInt();
    while(number !=- 1) {
        if (number >= 100 && number <= 999) {
            numhundreds = number / 100;
            numtens = number/10%10;
            numones = number%10;
            if (number == 100 || number == 200 || number == 300 || number == 400 || number == 500
            || number == 600 || number == 700 || number == 800 || number == 900){
               System.out.println("" + ones[numhundreds] + " " + "hundred");
               System.out.print("Number: ");
               number = In.nextInt();
           }else{
            System.out.println("" + ones[numhundreds] + " " + "hundred and " + tens[numtens] + " " + ones[numones]);
            System.out.print("Number: ");
            number = In.nextInt();
           }
       }
   }
}

}

输入111时，输出为110，而应为111。

Answer 1

首先，不要使用这样长的“ if”语句：

if (number == 100 || number == 200 || number == 300 || number == 400 || number == 500
        || number == 600 || number == 700 || number == 800 || number == 900)

您可以检查数字除以100是否没有余数，就像这样：

if(number%100==0)

因为100％100 = 0、200％100 = 0、300％100 = 0 ...

现在就像Rishaan said一样，您需要检查“ numtens”值是否为1，也可以使用conditional operator在print语句中执行该操作：

else{
     System.out.println("" + ones[numhundreds] + " " +
     "hundred and "+ (numtens == 1 ? ones[numones+10] : tens[numtens] + " " + ones[numones]));     
     System.out.print("Number: ");
     number = In.nextInt();
   }

Answer 2

您需要检查十位数是否等于1，并且可以执行以下操作：

if (numtens == 1)
{
    System.out.println(... + ones[numones + 10]);
} else {
    System.out.println(... + tens[numtens] + ones[numones]);
}

我会采用这种方法，可以轻松地对其进行修改以扩展为更大的数字，并且 imo 看起来更干净。

StringBuilder str = new StringBuilder();
if (numhundreds > 0)
{
    str.append(ones[numhundreds] + " hundred");
    if (numtens > 0 || numones > 0) str.append(" and ");
}
if (numtens > 0)
{
    if (numones == 1)
    {
        str.append(ones[numtens + numones]);
    } else {
        str.append(tens[numtens]);
        if (numones > 0) str.append(" ");
    }
}
if (numones > 1)
{
    str.append(ones[numones]);
}

Answer 3

遗漏了两个案例，即“ ... and [tens]”和“ [tens]”：

public static void main(String[] args) {
    int numones;
    int numtens;
    int numhundreds;
    int twenties;
    String [] ones = {"", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",
        "eleven", "twelve", "thirteen", "fourteen", "fiveteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty"};
    String [] tens = {"","", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
    Scanner In = new Scanner (System.in);
    System.out.print("Number: ");
    int number = In.nextInt();
    while(number !=- 1) {
        if (number >= 100 && number <= 999) {
            numhundreds = number / 100;
            numtens = number/10%10;
            numones = number%10;
            twenties = number%100;
            System.out.println("Nbr"+number+" "+numtens);
            if (number == 100 || number == 200 || number == 300 || number == 400 || number == 500
            || number == 600 || number == 700 || number == 800 || number == 900){
               System.out.println("" + ones[numhundreds] + " " + "hundred");
               System.out.print("Number: ");
               number = In.nextInt();
           }else if(number%100<20 && numtens==1){
                System.out.println("" + ones[numhundreds] + " " + "hundred and " + ones[twenties]);
                System.out.print("Number: ");
                number = In.nextInt();
           }else{
            System.out.println("" + ones[numhundreds] + " " + "hundred and " + tens[numtens] + " " + ones[numones]);
            System.out.print("Number: ");
            number = In.nextInt();
           }
        }else{
            twenties = number%100;
            System.out.println("" +ones[twenties]);
            System.out.print("Number: ");
            number = In.nextInt();
        }

   }
}

读取0-999之间的数字并以字为单位返回数字

3 个答案: