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2 Part Question: elapsed time  & writing data to a file in VC++

Posted on 1998-10-07
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Last Modified: 2010-04-01
Hello, I am quite a beginner in the C++ arena, so bare with me.

1)  I am trying to create a function that will collect a response time between hitting RETURN and typing the very first character of a sentence. (better explained below)
Example:

         Hit RETURN or ENTER to begin    (user hits the key)
         Begin typing your sentence      (printf statement)
(sentence 1) This is a test sentence <CR> (I want the timer
                                           to collect the
                                           the response time
                                           as soon as <CR>
                                           is hit.
(sentence 2) this is second sentence.     (The timer stops
                                           as soon as the
                                           first character
                                          of the next sente
                                          is typed.  In this
                                          case, 't' is
                                          typed in the word
                                          'this')
                                                                                   

Here is the code I have, but it's not quite working right.  It is collecting the time it takes for the entire sentence to be typed instead of the interval between hitting return and typing the first character of the next sentence.  I want
the user to eventually type in 5 sentences then go back to the main part of the program. and write this data (sentence and response time--see question 2)



void Do_Experiment(USHORT which)  <<--(using switch() to get
{                                     here in main program)
     if(which == 2)
     {
      clock_t begin, end;
      clock_t *t=NULL;
      double duration;
      char buffer[80];
      char character = '0';
      int i, j=0;
   printf("\nBegin typing your sentence. \n");
   for(i =0; i <=5; i++)
{
   while(scanf("\0", buffer));
   end = NULL;
   begin = clock();
   gets(buffer);
   if((character=getchar()) !='\n')
   {
   printf("character is... %c\n",character);
   buffer[j]=character;
   j++;
   }
   buffer[j-1]='\0';
   printf("buffer is...%s\n",buffer);
   end = clock();      
   duration = (double)(end-begin) / (double)CLOCKS_PER_SEC;
   printf("\nThe response time was %1.4f\n",duration);
 }  
}

2)  Next what I want to do is take the informatin that the user enters (the typed sentence) and the response time taken (see above) and write it to a file that can be viewed later for analysis.    

If you need/want to see the entire program, please let me know via email:  haubnerk@trac.wsmr.army.mil
I would like to thank you in advance for anyone that can help me out.
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Question by:haubnerk
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3 Comments
 

Author Comment

by:haubnerk
ID: 1174621
Thank you for any insight to this small snafu I have created for
myself.
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Accepted Solution

by:
shchuka earned 120 total points
ID: 1174622
1. I think, one problem is in gets(buffer) call.  This one will return only after the CR is pressed and you need to catch the first letter being typed in.  I think the way out is to use getch() or getche() (depending whether you do/don't need echo to the screen) to catch the first letter and then gets() to get the rest of the sentence.  A possible pitfall if the user wants to use backspace to delete the first typed letter.  You need to think about it.

2.Writing to a file is easy - are you using C or C++?
in C you would do something like this:

FILE *fp;

if((fp=fopen("filename","a"))==NULL)
    /* Some error occurred */
else {
    fprintf(fp,"%c%s\n%1.4f\n",first_char,buffer,duration);
    fclose(fp);
}

If you're using C++ you just open a file output tream fos and do
    fos << first_char << buffer << endl << duration;
After that, close the stream.

Hope this helps,
-Aleks.
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Author Comment

by:haubnerk
ID: 1174623
Thanks for the quick response, I will give this a try.
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