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  1. #include <stdio.h>
  2.  
  3. // for readability not advocating the 
  4. // usage of #define booleans etc
  5. #define TRUE  1
  6. #define FALSE 0
  7.  
  8. int isVowel (char c)
  9. {
  10.     switch (c)
  11.     {
  12.         case 'a': return TRUE;
  13.         case 'e': return TRUE;
  14.         case 'i': return TRUE;
  15.         case 'o': return TRUE;
  16.         case 'u': return TRUE;
  17.         case 'A': return TRUE;
  18.         case 'E': return TRUE;
  19.         case 'I': return TRUE;
  20.         case 'O': return TRUE;
  21.         case 'U': return TRUE;
  22.     }
  23.  
  24.     return FALSE;
  25. }
  26.  
  27. int hasOrderedVowels (char *str)
  28. {    
  29.     char c1, c2;
  30.  
  31.     c1 = *str;
  32.     c2 = *(++str);
  33.  
  34.     // ignore words beginning in vowels other then 'a' or 'A'
  35.     if ((isVowel(c1)) && !(c1 == 'a' || c1 == 'A'))
  36.           // && !(!(c1 == 'a' && c1 == 'A') && (c1 == 'a' || c1 == 'A')))
  37.     {
  38.         return FALSE;
  39.     }
  40.  
  41.     do {
  42.         // ignore case of `c1`
  43.         if (c1 >= 'a')
  44.             c1 -= 32;
  45.  
  46.         // ignore case of `c2`
  47.         if (c2 >= 'a')
  48.             c2 -= 32;
  49.  
  50.         // compare vowels and increment
  51.         // pointers as appropriate
  52.         if (isVowel(c1) && isVowel(c2))
  53.         {
  54.             // if we have found a vowel less then or equal to current
  55.             // then they are not in order/more then one, if we have found
  56.             // a 'U' and there are more vowels then this would be a duplicate
  57.             if (c2 <= c1 || c1 == 'U')
  58.                 return FALSE;
  59.  
  60.             c1 = c2;
  61.         } 
  62.         else if (isVowel(c2))  // found first vowel
  63.         {
  64.             if (!(c2 == 'a' || c2 == 'A'))
  65.             {
  66.                 return FALSE;
  67.             }
  68.             c1 = c2;
  69.         }
  70.         else if (!isVowel(c1))
  71.         {
  72.             c1 = *(str += 2);
  73.         }
  74.         c2 = *(++str); 
  75.     } 
  76.     while (c2 != '\0');
  77.  
  78.     return (c1 == 'U' || c1 == 'u');
  79. }
  80.  
  81. int main ()
  82. {
  83.     char *str[] = {"aeiou", "facecious", "chimpanze", "baboon"};
  84.     int i = 0;
  85.  
  86.     for (; i<4; i++)
  87.     {
  88.         printf ("%s: %i\n", str[i], hasOrderedVowels(str[i]));
  89.     }
  90.  
  91.     return 0;
  92. }
Success #stdin #stdout 0.01s 1720KB
comments ()
stdin
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Standard input is empty
stdout
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aeiou: 1
facecious: 1
chimpanze: 0
baboon: 0
https://ideone.com/dPvc3
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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