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

const int STRLEN= 50;

int 
main(int argc, char **argv)
{
    char *vowels="aeiou";
    char *ptr,*found_vowels,*src,*dest,*instr;
    // first check that there is at least one argument
    if(argc < 2) {
       cout << " there aren't enough arguments" << endl;
       cout << "Usage: " << argv[0] << " string1 [string2 string 3 ... ]" << endl;
       exit(1);
    }

    /* run this for each of the arguments on the command line. */
    for(int argcount = 1; argcount < argc; argcount ++ ) {
       src= instr=argv[argcount];  /* the string to work on */
       cout << "the input string was :" << instr << ":" << endl;

       // get some new space for the vowels. We know there aren't more
       // vowels than there are letters in the string
       found_vowels = new char[strlen(instr) + 1];
       dest = found_vowels;
       while(*instr) {  // for each letter in the input string
          ptr = vowels;
          // for each vowel, check if this letter is one
          while (*ptr) {
             if(*instr == *ptr) {  // found one
               *dest++ = *ptr;    
             }
             ptr++; // go to the next vowel
          } // inner while
          *dest = '\0';  /* we have to put a NUL at the end of the string */
          instr++;
       } // outer while 

       cout << "Done using vowel string method for string " <<  src << endl;
       cout << "there were " << strlen(found_vowels) << " vowels and they were " << found_vowels << endl;
       cout << "\n--------------------------\n" << endl;
       delete [] found_vowels;


       // now we do it using a switch statement
       src= instr=argv[argcount];  /* the string to work on */
       found_vowels = new char[strlen(instr) + 1];
       dest = found_vowels;
       while(*instr) {  // for each letter in the input string
          switch(*instr) {
             case 'a':
             case 'e':
             case 'i':
             case 'o':
             case 'u':
                        *dest++ = *instr;
                        break;
          } // esac
          instr++;
       } // while
       *dest = '\0';

       cout << "Done using case statement method for string " <<  src << endl;
       cout << "there were " << strlen(found_vowels) << " vowels and they were " << found_vowels << endl;
       cout << "\n--------------------------\n" << endl;
       delete [] found_vowels;

    } // for
    return 0;
} // main