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  1. // Elaine Torrez                                          CS1A
  2. // _____________________________________________________________
  3. // 
  4. // COUNT WORDS IN STRING
  5. // _____________________________________________________________
  6. // This program prompts the user to enter a sentence and then
  7. // determines the number of words in the sentence. A word is 
  8. // defined as a sequence of characters separated by spaces.
  9. // _____________________________________________________________
  10. // INPUT
  11. //   userStr : The sentence entered by the user
  12. //
  13. // OUTPUT
  14. //   words   : Number of words in the sentence
  15. // _____________________________________________________________
  16.  
  17. #include <iostream>
  18. using namespace std;
  19.  
  20. // FUNCTION PROTOTYPE
  21. int countWords(const char *str);
  22.  
  23. int main()
  24. {
  25.     /****************************************************
  26.      * VARIABLE DECLARATIONS
  27.      ****************************************************/
  28.     const int SIZE = 200;
  29.     char userStr[SIZE];      // INPUT sentence
  30.     int words;               // OUTPUT word count
  31.  
  32.     /****************************************************
  33.      * INPUT
  34.      ****************************************************/
  35.     cout << "Enter a sentence: ";
  36.     cin.getline(userStr, SIZE);
  37.  
  38.     /****************************************************
  39.      * PROCESS
  40.      ****************************************************/
  41.     words = countWords(userStr);
  42.  
  43.     /****************************************************
  44.      * OUTPUT
  45.      ****************************************************/
  46.     cout << "\nNumber of words: " << words << endl;
  47.  
  48.     return 0;
  49. }
  50.  
  51. // *************************************************************
  52. // countWords
  53. // -------------------------------------------------------------
  54. // Returns the number of words in a C-string. Words are counted
  55. // by detecting transitions from spaces to non-space characters.
  56. // *************************************************************
  57. int countWords(const char *str)
  58. {
  59.     int count = 0;
  60.     bool inWord = false;
  61.  
  62.     for (int i = 0; str[i] != '\0'; i++)
  63.     {
  64.         if (str[i] != ' ' && !inWord)
  65.         {
  66.             // Starting a new word
  67.             inWord = true;
  68.             count++;
  69.         }
  70.         else if (str[i] == ' ')
  71.         {
  72.             inWord = false;
  73.         }
  74.     }
  75.  
  76.     return count;
  77. }
  78.  
Success #stdin #stdout 0s 5312KB
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Four score and seven years ago
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Enter a sentence: 
Number of words: 6
https://ideone.com/zhxbT6
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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