Question

我需要帮助将一个单词存储在一个变量中并从我的指南针程序中输出我的消息。我需要编写一个程序让用户输入指南针方向，然后打印一条消息。我不知道为什么它不输出方向，我需要将整数转换为字符串/

示例输出：

Input compass direction(Eg.S45E):
S45E
Start facing South.Turn 45 degrees towards East.

代码：

// Initializes the BufferReader for user input
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//initiates first do-while loop

String word = null;
String word2 = null;

System.out.println("Compass Directions");
System.out.println("==================");
System.out.println("Input a compass direction "
                    + "(E.g. S45E):");
String userInput = br.readLine();

/*gets unicode from users first given letter 
to find direction */
int direction = userInput.charAt(0);
//finds unicode at the last character entered
int direction2 = userInput.charAt(3);

//check direction input and prints it
if (direction == 78)
    word="North";
else if (direction == 83)
    word="South";
else if (direction == 87)
    word="West";
else if (direction == 69)
    word="East";

//gets degree #1
char degrees1 = userInput.charAt(1);
//gets degree #2
char degrees2 = userInput.charAt(2);

if (direction2 == 78)
    word2="North";
else if (direction2 == 83)
    word2="South";
else if (direction2 == 87)
    word2="West";
else if (direction2 == 69)
    word2="East";

System.out.println("Start facing "+word+" turn "+degrees1+degrees2+" degrees to the "+word2);

Answer 1

如果你把问题分解成碎片，事情会简单得多，例如 -

// Convert the character representing a direction, into a cardinal direction.
private static String getDirection(char direction) {
  if (direction == 'N' || direction == 'n') {
    return "North";
  } else if (direction == 'S' || direction == 's') {
    return "South";
  } else if (direction == 'E' || direction == 'e') {
    return "East";
  } else if (direction == 'W' || direction == 'w') {
    return "West";
  }
  return "Unknown";
}

public static void main(String[] args)
    throws InterruptedException {
  // Construct a scanner.
  Scanner scanner = new Scanner(System.in);

  // The output message format.
  String fmt = "Start facing %s.Turn %s degrees towards %s.";
  // Loop forever.
  for (;;) {
    // Print directions.
    System.out.println("Compass Directions");
    System.out.println("==================");
    System.out.println("Input a compass direction "
        + "(E.g. S45E):");
    // Check that System.in hasn't been closed.
    if (!scanner.hasNextLine()) {
      break;
    }
    // Get input.
    String line = scanner.nextLine();
    String start = getDirection(line.charAt(0));
    String end = getDirection(line.charAt(line
        .length() - 1));
    String msg = String.format(fmt, start,
        line.substring(1, line.length() - 1), end);
    System.out.println(msg);
  }
}

Answer 2

你最好的镜头可能是一次一个字符循环输入字符串，但使用开关块而不是无数的if语句：

String direction = "";
String word2 = br.ReadLine();
foreach (char c in word2.toCharArray();
{
  switch (c)
  {
    case 'N':
      direction = "North";
      break;
    case 'S':
      direction = "South";
      break;
    ... // Do the rest here
  }
}

需要针对多个方向（NE，NW SW，NNE等）调整示例，但这应该提供更可行的起点。

如何将单词存储到指南针程序中的变量中

2 个答案: