用户输入一个数字，输出相应的英文结果（包含负数）

[lin式程序猿]

package day04;
/*
 * 用户输入一个正整数，输出相应英文；例如输入123，输出one two three
 */
import java.util.Scanner;

public class WhileDemo {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int x = in.nextInt();
		int y = x;
		int mode = 1;
		while(y >=10){
			y /=10;
			mode*=10;
		}
//		System.out.println(mode);
		while(mode>0){
			switch(x/mode){
			case 0 : System.out.print("zero");break;
			case 1 : System.out.print("one");break;
			case 2 : System.out.print("two");break;
			case 3 : System.out.print("three");break;
			case 4 : System.out.print("four");break;
			case 5 : System.out.print("five");break;
			case 6 : System.out.print("six");break;
			case 7 : System.out.print("seven");break;
			case 8 : System.out.print("eight");break;
			case 9 : System.out.print("nine");break;
			}
			x %=mode;
			mode/=10;
			
		}
	}
}

帮我补充完代码，实现用户输入负数的情况，并且负数用minus来代替，如输入-123，输出minus one two three，谢谢！

[rickylin86]

直接在开始判断获取到的数字是否大于零.如果小于零则先提前输出minus 并且用Math.abs(int)来获取返回绝对值.然后继续你的下面的代码就可以了.

[古采尼丶]

楼主参考下~

[nikyotensai]

这个不难，只是复杂吧！别偷懒

[菜 头]

楼上+1

[bree06]

给一个用空间换时间的做法.

class Demo51 
{
	static final String[] number = {"minus", "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
	public static void main(String[] args) {
		String str = "-122897436603273";
		for (char c : str.toCharArray()) {
			int _c = (_c = c - 47) == -2 ? 0 : _c;
			System.out.print(number[_c] + ' ');
		}
		System.out.println();
	}
}

再给一个完整的对数字合法性的检查

class Demo51 
{
	static final String[] number = {"minus", "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
	public static void main(String[] args) {
		// 测试数据
//		String str = "-122897436603273";
//		String str = "-1228974-";
//		String str = "122897436603273";
//		String str = "+122";
//		String str = "1+22";
		String str = "123443a45c33";
		try {
			char[] values = str.toCharArray();
			for (int i = 0; i < values.length; i++) {
				int _c = (_c = values[i] - 47) == -2 ? 0 : _c;
				if (_c == -4 && i == 0) continue; // 首位是+, 如+123
				if (_c == 0 && i > 0) { // 负数但是-号不在第一位, 或者多个-号
					throw new RuntimeException("不是一个合法的负数");
				}
				System.out.print(number[_c] + ' ');
			}
		} catch (ArrayIndexOutOfBoundsException e) {
			System.out.println(str + "不是一个合法的数字");
		} catch (RuntimeException e) {
			e.printStackTrace();
		}
		System.out.println();
	}
}

[快乐先生]

直接将输入的整数按字符串处理，获取每一个字符，用case输出相应的英文就行了。

[我纯洁全身都纯洁]

/*
 * 用户输入一个正整数，输出相应英文；例如输入123，输出one two three
 */
import java.util.Scanner;
 
public class WhileDemo {
 
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int x = in.nextInt();
        if (x < 0) {
        	System.out.print("minus ");
        	x = Math.abs(x);
        }
        int y = x;
        int mode = 1;
        while(y >=10){
            y /=10;
            mode*=10;
        }
//        System.out.println(mode);
        while(mode>0){
            switch(x/mode){
            case 0 : System.out.print("zero");break;
            case 1 : System.out.print("one");break;
            case 2 : System.out.print("two");break;
            case 3 : System.out.print("three");break;
            case 4 : System.out.print("four");break;
            case 5 : System.out.print("five");break;
            case 6 : System.out.print("six");break;
            case 7 : System.out.print("seven");break;
            case 8 : System.out.print("eight");break;
            case 9 : System.out.print("nine");break;
            }
            x %=mode;
            mode/=10;
            System.out.print(" ");
        }
    }
}

输入/输出

-1561
minus one five six one 

[qq_30969395]

public class TestMain {

	public static void main(String args[]){
		String str = "-152";
		for(int i=0;i<str.length();i++){
			 switch(str.charAt(i)){
			    case '-':System.out.print("minus");break;
			    case '0': System.out.print("zero");break;
	            case '1' : System.out.print("one");break;
	            case '2': System.out.print("two");break;
	            case '3' : System.out.print("three");break;
	            case '4' : System.out.print("four");break;
	            case '5' : System.out.print("five");break;
	            case '6' : System.out.print("six");break;
	            case '7' : System.out.print("seven");break;
	            case '8' : System.out.print("eight");break;
	            case '9' : System.out.print("nine");break;
			   }
			 System.out.print(" ");
		}
	}

[lin式程序猿]

引用 3 楼 qq_35232728 的回复:

楼主参考下~

好仔细！！