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Need help translating code

  1. Jan 30, 2005 #1
    I wrote an (small) AI script for twenty questions in perl, however i need the code translated into C++ (i ahve some knowledge of C++, but not enough to write this program). Thanx for the help:

    Code (Text):
    #!/usr/bin/perl

    use warnings;

    $ans = 0;
    $qnumber = 1;

    while (($ans == 0)&& ($qnumber < 20)) {
        print "Ask a question: \n";
        $_ = <STDIN>;
       
        if (/end/ && /vowel/ && (/everything/ || /anything/)){
        print "You got it right!\n";
        $ans = 1;
        } elsif (/a$/ or /e$/ or /i$/ or /o$/  or /u$/ or /a\?$/ or /e\?$/ or /i\?$/ or /o\?$/  or /u\?$/ ) {
        print "Yes\n";
        } else {
        print "No\n";
        }
        $qnumber ++ ;
        if ($qnumber == 20){
        print "You've run out of questions.  Better luck next time!\n";
        }
    }
     
  2. jcsd
  3. Jan 31, 2005 #2
    Or at least direct me to a resource that would cover everything needed to write this in C++?
     
  4. Jan 31, 2005 #3
  5. Jan 31, 2005 #4
    yeah the C++ tutorial here doesn't cover regular expressions and patterns, i already checked that. The code checks for a vowel at the end of whatever string is input into it.
     
  6. Jan 31, 2005 #5
    You don't need to use regular expressions in c in order to find substrings and characters.
    You can use the c functions strstr and strchr.

    By the way, the line in your perl program:

    Code (Text):
    elsif (/a$/ or /e$/ or /i$/ or /o$/  or /u$/ or /a\?$/ or /e\?$/ or /i\?$/ or /o\?$/  or /u\?$/ ) {
    would be better written:

    Code (Text):
    elsif(/[aeiou]\??$/)
     
  7. Jan 31, 2005 #6
    I'm rather new to perl, but yeah i have condensed it quite a bit from what i posted here.

    I have a very limited knowledge of C++ (i can write a program to solve equations, but thats about all). HOw do you use those functions?
     
  8. Jan 31, 2005 #7
    strstr
    and
    strchr

    You don't need to use c++ to write a program like that. You can stick with plain c.
     
  9. Jan 31, 2005 #8
    most of the program is easy to change, but the checking for the expressions needs some more work. I do not know what the Perl expressions mean, especially (/everything/ || /anything/) seems mysterious to me, but anyway here is the C++ translation without the conditionals:

    Code (Text):

    #include <iostream>
    #include <string>
    using namespace std;

    int main()
    {
      int ans = 0;
      int qnumber = 1;
      string question;

      while (ans == 0 && qnumber < 20) {
        cout << "Ask a question: " << endl;
        cin >> question;
       
        if (........){
        cout << "You got it right!" << endl;
        ans = 1;
        } elsif (........) {
        cout << "Yes" << endl;
        } else {
        cout << "No" << endl;
        }
        qnumber++;
        if (qnumber == 20){
        cout << "You've run out of questions.  Better luck next time!" << endl;
        }
      }
    }
     
    You can do that with:
    Code (Text):
    char c = question[strlen(question) - 1];

    if (c == 'a' || c == 'e' || c == 'u' || c == 'o' || c == 'i')
      ......
     
  10. Jan 31, 2005 #9
    Well, if it helps, this is not class work.

    It was a late night replacement for sleep (my insomnia is that bad). But i wanted to send it to a friend for him to toy around with, but i didn't know C++ well enough to write this (its the only language he's learned so far), so i had to write it in Perl.
     
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