字数统计程序-STDIN [英] Word count program - stdin

问题描述

对于以下问题，

编写一个程序以读取英语文本到数据结尾(类型为control-D的数字表示终端的数据结尾，请参见下文进行检测)，并打印一个字长计数，即出现的长度为1的单词，长度为2的数量，等等.

Write a program to read English text to end-of-data (type control-D to indicate end of data at a terminal, see below for detecting it), and print a count of word lengths, i.e. the total number of words of length 1 which occurred, the number of length 2, and so on.

将一个单词定义为字母字符序列.您应该允许最多25个字母的单词长度.

Define a word to be a sequence of alphabetic characters. You should allow for word lengths up to 25 letters.

典型输出应如下所示:

        length 1 : 10 occurrences
        length 2 : 19 occurrences
  length 3 : 127 occurrences
     length 4 : 0 occurrences
        length 5 : 18 occurrences
        ....

要读取字符到数据末尾，请参阅上面的问题.

To read characters to end of data see above question.

---

这是我的工作解决方案，

---

Here is my working solution,

#include<stdio.h>
int main(void){
  char ch;
  short wordCount[20] = {0};
  int count = 0;
  while(ch = getchar(), ch >= 0){
    if(ch == ' ' || ch == ',' || ch == ';'|| ch == ':'|| ch == '.'|| ch == '/'){
      wordCount[count]++;
      count=0;
    }else{
      count++;
    }
  }
  wordCount[count]++; // Incrementing here looks weird to me

  for(short i=1; i< sizeof(wordCount)/sizeof(short); i++){
    printf("\nlength %d : %d occurences",i, wordCount[i]);
  }
}

---

问题:

1)

从代码优美的角度来看，我可以避免在 while 循环之外增加(++) wordCount 吗?

From code elegance aspect, Can I avoid incrementing(++) wordCount outside while loop?

2)

我可以根据字长而不是恒定大小 20 来使 wordCount 数组大小更动态吗?

Can I make wordCount array size more dynamic based on word size, rather than constant size 20?

注意:了解 struct ，但尚未学习动态结构，例如 Linkedlist

Note: Learnt about struct but am yet to learn dynamic structures like Linkedlist

推荐答案

对于动态分配，您可以以20个 shorts 的空格开头(尽管问题陈述似乎要求您允许单词最多25个字符):

For the dynamic allocations you can start with space for 20 shorts (although the problem statement appears to ask for you to allow for words up to 25 characters):

short maxWord = 20;
short *wordCount = malloc(sizeof(*wordCount) * maxWord);

然后，当当前单词的长度大于动态数组中可以计数的长度时，当增加 count 时，您可以分配更多空间:

Then, when you increment count you can allocate more space if the current word is longer than can be counted in your dynamic array:

} else {
    count++;
    if (count >= maxWord) {
        maxWord++;
        wordCount = realloc(sizeof(*wordCount) * maxWord);
    }
}

完成后别忘了 free(wordCount).

由于不需要计算零个长度的单词，因此您可以考虑修改代码，以便 wordCount [0] 存储长度为1的单词数，依此类推.

Since you don't need to count zero-length words, you might consider modifying your code so that wordCount[0] stores the number of words of length 1, and so on.

这篇关于字数统计程序-STDIN的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！