如何计算至少包含 3 个元音的单词的数量

Question

我想知道是否可以寻求帮助。我正在用 C 编写一个程序，它写出字符串中的字符、单词和元音的数量（添加了一些打印语句）。我试图弄清楚如何编写一个循环遍历字符串并计算包含至少 3 个元音的单词的数量的代码。我觉得这是一个非常容易编写的代码，但它似乎总是让我难以理解的最简单的事情。有什么帮助吗？

另外：作为 C 新手，我如何在使用函数 int vowel_count(char my_sen[]) 而不是使用我的 main 中的代码时获得相同的结果？

如果这有点令人困惑，我的意思是因为我的 main 已经包含计算输入中元音数量的代码，我怎样才能将所述代码转移到这个函数中并仍然在 main 中调用它？

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define SENTENCE 256


int main(void){

char my_sen[SENTENCE], *s; //String that containts at most 256 as well as a pointer
int words = 1, count = 0,vowel_word = 0; //Integer variables being defined
int i,vowel = 0, length;  //More definitions
printf("Enter a sentence: ");//Input sentence
gets(my_sen);//Receives and processes input
length = strlen(my_sen); //Stores the length of the input within length

for(i=0;my_sen[i] != '\0'; i++){
    if(my_sen[i]=='a' || my_sen[i]=='e' || my_sen[i]=='i' || my_sen[i]=='o' || my_sen[i]=='u' || //Loop that states if the input contains any of the following
       my_sen[i]=='A' || my_sen[i]=='E' || my_sen[i]=='I' || my_sen[i]=='O' || my_sen[i]=='U')   //characters(in this case, vowels), then it shall be
       {                                                                                         //stored to be later printed
           vowel++;
       }


    if(my_sen[i]==' ' || my_sen[i]=='!' || my_sen[i]=='.' || my_sen[i]==',' || my_sen[i]==';' || //Similar to the vowel loop, but this time
        my_sen[i]=='?')                                                                          //if the following characters are scanned within the input
        {                                                                                        //then the length of the characters within the input is
            length--;                                                                            //subtracted

                    }

}


for(s = my_sen; *s != '\0'; s++){ //Loop that stores the number of words typed after
    if(*s == ' '){                //each following space
    count++;
}
}


printf("The sentence entered is %u characters long.\n", length); //Simply prints the number of characters within the input
printf("Number of words in the sentence: %d\n", count + 1); // Adding 1 to t[he count to keep track of the last word
printf("Average length of a word in the input: %d\n", length/count);//Prints the average length of words in the input
printf("Total Number of Vowels: %d\n", vowel);//Prints the number of vowels in the input
printf("Average number of vowels: %d\n", vowel/count);//Prints the average number of vowels within the input
printf("Number of words that contain at least 3 vowels: %d\n", vowel_word);//Prints number of words that contain at least 3 vowels
return 0;
}

Answer 1

这不是什么大问题。

#include <ctype.h>
#include <stdio.h>
#include <string.h>

int vowel_count(char my_sen[])
{
  int wcount = 0; // number of words with 3+ vowel chars
  int vcount = 0; // current number of vowel chars in the current word
  int i = 0; // index into the string
  int ch;
  while ((ch = my_sen[i++]) != '\0')
  {
    if (isspace(ch) || !isalpha(ch))
    {
      // ch is not an alphabetical char, which can happen either
      // before a word or after a word.
      // If it's after a word, the running vowel count can be >= 3
      // and we need to count this word in.
      wcount += vcount >= 3; // add 1 to wcount if vcount >= 3
      vcount = 0; // reset the running vowel counter
      continue; // skip spaces and non-alphabetical chars
    }
    if (strchr("aeiouAEIOU", ch) != NULL) // if ch is one of these
    {
      ++vcount; // count vowels
    }
  }
  // If my_sen[] ends with an alphabetical char,
  // which belongs to the last word, we haven't yet
  // had a chance to process its vcount. We only
  // do that in the above code when seeing a non-
  // alphabetical char following a word, but the
  // loop body doesn't execute for the final ch='\0'.
  wcount += vcount >= 3; // add 1 to wcount if vcount >= 3
  return wcount;
}

int main(void)
{
  char sen[] = "CONSTITUTION: We the People of the United States...";
  printf("# of words with 3+ vowels in \"%s\" is %d", sen, vowel_count(sen));
  return 0;
}

输出（ideone）：

# of words with 3+ vowels in "CONSTITUTION: We the People of the United States..." is 3

顺便说一句，你可以改变这个函数来计算你需要的所有东西。它已经找到了单词的开始和结束位置，因此简单的单词计数很容易实现。还有字长。以此类推。

Answer 2

1) 获取字符串，

2) 使用strtok() 得到每个单词用空格隔开。

3) 逐个字符循环遍历每个字符串以检查它是否为元音。

Answer 3

请检查以下代码

    #include<stdio.h>
    #include <string.h>

    int count_vowels(char []);
    int check_vowel(char);

    main()
    {
      char array[100];
      printf("Enter a string\n");
      gets(array);
      char seps[] = " ";
      char* token;
      int input[5];
      int i = 0;
      int c = 0;
      int count = 0;

      token = strtok (array, seps);
      while (token != NULL)
      {
         c = 0;
         c = count_vowels(token);
         if (c >= 3) {
            count++;
         }
         token = strtok (NULL, seps);
       }
       printf("Number of words that contain atleast 3 vowels : %d\n", count);
       return 0;
    }

    int count_vowels(char a[])
    {
       int count = 0, c = 0, flag;
       char d;

       do
       {   
          d = a[c];

          flag = check_vowel(d);

          if ( flag == 1 )
             count++;

          c++;
       }while( d != '\0' );

       return count;
    }

    int check_vowel(char a)
    {
       if ( a >= 'A' && a <= 'Z' )
          a = a + 'a' - 'A';   /* Converting to lower case */

       if ( a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
          return 1;

       return 0;
    }