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[C++] While loops and filters

 
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Kipodimkozim
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PostPosted: Fri Dec 26, 2008 5:01 pm    Post subject: [C++] While loops and filters Reply with quote
Hey guys,

The book I'm learning from demonstrate the use of while loops with filters by compiling this code:

Code:
#include <iostream>
#include <stdio.h>
using namespace std;

#define NEWLINE 'endl'

void main()
{
   char c;
   int linenum = 1;

   std::cout << std::dec << linenum << ": ";
   while ((c = getchar()) != EOF) {
      if (c == NEWLINE) {
         linenum++;
       std::cout << NEWLINE << std::dec << linenum << ": ";
      } else
         putchar(c);
   }
}


and using this filter "linenum <linenum.cpp> linemun.txt" to write a number at the begining of each line and saving it as a new txt file.
I had to manipulate the code to compile with VCpp6 since the book using a different compiler, other than that they're the same and I had no problem compiling it, but when I'm runnig the exe file and typing the filter all I get is an echo of the filter..
Why isnt working?
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PostPosted: Fri Dec 26, 2008 6:03 pm    Post subject: Reply with quote
'\n'... std::endl is not type char and 'endl' is not a single character...
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&Vage
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PostPosted: Fri Dec 26, 2008 7:26 pm    Post subject: Reply with quote
Code:

using namespace std;


Use that so you won't have to put "std::" in every std function.
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PostPosted: Fri Dec 26, 2008 8:02 pm    Post subject: Reply with quote
He is...
Quote:
#include <iostream>
#include <stdio.h>
using namespace std;
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&Vage
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PostPosted: Fri Dec 26, 2008 8:23 pm    Post subject: Reply with quote
Oh didn't see it, I was just looking at the main code.
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ups2000ups
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PostPosted: Sat Dec 27, 2008 1:44 am    Post subject: Reply with quote
sorry i cant answear right now i just woke up and my braincells still sleeps Razz

anyway a tip

when you are coding you should make the codes look clean and use alot of "return" so it will be easier to read

well this is easy to read right now but when you will start doing bigger codes

you are using "using namespace std;"
thats mean you can just write like this

cout
cin

instead of
std::cout
std::cin

(it will just look cleaner)

if you take a look at the changes i did you will see thats it is easier to read and thats make it easier to help you fix it

ps instead of use linenum++ and then show it in the text you could insert it in the text directly if you use this ++linenum

++linenum = add 1 to linenum before read linenum (prefix)
linenum++ = add 1 to linenum after being readed (postfix)

Code:

#include <iostream>
#include <stdio.h>
using namespace std;

#define NEWLINE 'endl'

void main()
{
   char c;
   int linenum = 1;

   cout << dec << linenum << ": ";

   while ((c = getchar()) != EOF) {
      if (c == NEWLINE) {
         cout << NEWLINE << dec << ++linenum << ": ";
      }
      else
         putchar(c);
   }
}
 


and your code
Code:

#include <iostream>
#include <stdio.h>
using namespace std;

#define NEWLINE 'endl'

void main()
{
   char c;
   int linenum = 1;

   std::cout << std::dec << linenum << ": ";
   while ((c = getchar()) != EOF) {
      if (c == NEWLINE) {
         linenum++;
       std::cout << NEWLINE << std::dec << linenum << ": ";
      } else
         putchar(c);
   }
}

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Kipodimkozim
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PostPosted: Sat Dec 27, 2008 8:44 am    Post subject: Reply with quote
Thanks guys =]]
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[ ] HT Pendant

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