Question

我目前正在从事一项作业，我的任务是在多行中读取几个句子的输入，并在输出文件的两列中打印出单词。我已经完成了大部分的任务，但是程序正在另一行中编写某些行的第二个单词。有人知道发生了什么吗？

这是输入文件的文本：

This summer I will be going to training. I will be going to training for PLTW CSP. It will be two weeks long. It should be in san jose. I love pizza! I also like to eat burgers. I want to die. The square root of 81 is 9. I want to play checkers. I also would like to play chess. Heaven would be something I aspire to go to. The square root of 64 is 8. I cannot wait to eat my pizza. Samsung just released a new phone I have an LG G7. Atom is my editor of choice. I need to get a new tv. *注意：第一行以“圣荷西”结尾。

代码如下：

import java.io.*;
import java.util.*;

public class Main {
  public static void main(String[] args) throws FileNotFoundException {
    File inputFile = new File("input.txt");
    Scanner in = new Scanner(inputFile);
    PrintWriter out = new PrintWriter("output.txt");

    //in.useDelimiter("[^A-Za-z]+");
    String input = "";
    while (in.hasNextLine()) {
      int count = 0;
      input = in.nextLine();
      input = input.replace(".", "");
      input = input.replace("!", "");

      Scanner lineScanner = new Scanner(input);
      String words = "";
      while (lineScanner.hasNext()) {
        count++;
        words = lineScanner.next();
        out.printf("%10.10s", words);
        if (count % 2 == 0) {
          out.println();
        }
      }
    }
      out.close();
  }
}

这是输出：

     This    summer
         I      will
        be     going
        to  training
         I      will
        be     going
        to  training
       for      PLTW
       CSP        It
      will        be
       two     weeks
      long        It
    should        be
        in       san
      jose         I      love
     pizza         I
      also      like
        to       eat
   burgers         I
      want        to
       die       The
    square      root
        of        81
        is         9
         I      want
        to      play
  checkers         I
      also     would
      like        to
      play     chess
    Heaven     would
        be something
         I    aspire
        to        go
        to       The    square
      root        of
        64        is
         8         I    cannot
      wait        to
       eat        my
     pizza   Samsung      just
  released         a
       new     phone
         I      have
        an        LG
        G7      Atom        is
        my    editor
        of    choice
         I      need
        to       get
         a       new
        tv

Answer 1

问题是当int counter = 0 char * charptr[500]; //this is gonna store adresses to some char[] 's char OurString[500]; //variable that will hold user's input while(true){ cin >> OurString; charptr[counter] = new char [500]; charptr[counter] = OurString // mistake - charptr[counter] gets assigned physical adress of OutString while that's not exactly what we want }循环转到下一个迭代时，while总是重置为0，并且总是在同一行上添加两个单词（由于count的条件）。但是到那时，您可能已经在上一次循环迭代的同一行上有一个单词（在这种情况下，是从上一句话开始）。

有很多方法可以修复它。例如，您可以将if (count % 2 == 0)移出int count = 0;循环：

while

然后输出将是：

import java.io.*;
import java.util.*;

public class Main {
  public static void main(String[] args) throws FileNotFoundException {
    File inputFile = new File("input.txt");
    Scanner in = new Scanner(inputFile);
    PrintWriter out = new PrintWriter("output.txt");

    //in.useDelimiter("[^A-Za-z]+");
    String input = "";
    int count = 0;
    while (in.hasNextLine()) { 
      input = in.nextLine();
      input = input.replace(".", "");
      input = input.replace("!", "");

      Scanner lineScanner = new Scanner(input);
      String words = "";
      while (lineScanner.hasNext()) {
        count++;
        words = lineScanner.next();
        out.printf("%10.10s", words);
        if (count % 2 == 0) {
          out.println();
        }
      }
    }
      out.close();
  }
}

out.printf无法打印预期结果

1 个答案: