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Countdown program

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Countdown program

 
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  #1
Mar 14th, 2009
I'm trying to get this countdown to work. I'm trying to get it to countdown from 10 down to "Blast off", with Blast off being 0. Each output replaces the one before it. I'm very confused. 10 does not print, but 9 to Blast off do. When when it Blast off prints, it keeps printing. Does anyone know how I can print 10 and also print Blast off one time?
Please help!
Thanks!

  
 
  
 C++ Syntax (Toggle Plain Text) 
 
 
 
  1. #include <iomanip>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. #ifdef __GNUC__
  6. #include <unistd.h>
  7. #endif
  8.  
  9. #ifdef _WIN32
  10. #include <cstdlib>
  11. #endif
  12.  
  13. int main()
  14. {
  15.   cout << "CTRL-C to exit...\n";
  16.  
  17.       for (int tens = 10; tens > 0; tens--)
  18.       {
  19.         for (int units = 9; units < 10; units--)
  20.         {
  21.           cout << tens << '\r';
  22. 	  cout << ' ' << units;
  23.   	  if (units < 1)
  24.   	  cout << '\r' << "Blast off!\n";
  25.  
  26. 	  cout.flush();
  27.  
  28.           #ifdef __GNUC__
  29.           sleep(1); // one second
  30.           #endif
  31.  
  32.           #ifdef _WIN32
  33.           _sleep(1000); // one thousand milliseconds
  34.           #endif
  35.  
  36.           cout << '\r'; // CR
  37.         }
  38.       }
  39.   return 0; 
  40. } // main
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Re: Countdown program

 
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  #2
Mar 14th, 2009
If you're just counting down from 10 to 0 I'm not exactly sure why you've used 2 loops. Surely a single loop would do the job.
I do notice that the inner loop won't terminate because your condition (units < 10) is incorrect. units is counting down and will always be less than 10 (or at least for a VERY long time).
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Re: Countdown program

 
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  #3
Mar 14th, 2009
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Originally Posted by MrSpigot View Post
If you're just counting down from 10 to 0 I'm not exactly sure why you've used 2 loops. Surely a single loop would do the job.
I do notice that the inner loop won't terminate because your condition (units < 10) is incorrect. units is counting down and will always be less than 10 (or at least for a VERY long time).
Alright. I now have one loop and the program ends, but now it prints(still replacing each number):
10
90
80
70
60
50
40
30
20
10
(program ends)

I don't know how to get rid of the zero's and print "Blast off!"
Here's the code block I changed:
From this (Old):
C++ Syntax (Toggle Plain Text) 
  1.   for (int tens = 10; tens > 0; tens--)
  2.       {
  3.         for (int units = 9; units < 10; units--)
  4.         {
  5.           cout << tens << '\r';
  6. 	  cout << ' ' << units;
  7.   	  if (units < 1)
  8.   	  cout << '\r' << "Blast off!\n";
  9.  
  10. 	  cout.flush();
To (New):
C++ Syntax (Toggle Plain Text) 
  1. for (int units = 10; units > 0; units--)
  2.         {
  3. 	  cout << units;
  4.   	  if (units < 1)
  5.   	  cout << '\r' << "Blast off!\n";
  6.  
  7. 	  cout.flush();
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Re: Countdown program

 
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  #4
Mar 14th, 2009
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Originally Posted by blahblah619 View Post
Alright. I now have one loop and the program ends, but now it prints(still replacing each number):
10
90
80
70
60
50
40
30
20
10
(program ends)

I don't know how to get rid of the zero's and print "Blast off!"
Here's the code block I changed:
From this (Old):
C++ Syntax (Toggle Plain Text) 
  1.   for (int tens = 10; tens > 0; tens--)
  2.       {
  3.         for (int units = 9; units < 10; units--)
  4.         {
  5.           cout << tens << '\r';
  6. 	  cout << ' ' << units;
  7.   	  if (units < 1)
  8.   	  cout << '\r' << "Blast off!\n";
  9.  
  10. 	  cout.flush();
To (New):
C++ Syntax (Toggle Plain Text) 
  1. for (int units = 10; units > 0; units--)
  2.         {
  3. 	  cout << units;
  4.   	  if (units < 1)
  5.   	  cout << '\r' << "Blast off!\n";
  6.  
  7. 	  cout.flush();
Post the entire updated program please so we know for sure what has been changed and what hasn't. I can't see why the updated code would result in that output.
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Re: Countdown program

 
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  #5
Mar 14th, 2009
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Originally Posted by VernonDozier View Post
Post the entire updated program please so we know for sure what has been changed and what hasn't. I can't see why the updated code would result in that output.
Here's the program. I'm so confused!
C++ Syntax (Toggle Plain Text) 
  1. #include <iomanip>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. #ifdef __GNUC__
  6. #include <unistd.h>
  7. #endif
  8.  
  9. #ifdef _WIN32
  10. #include <cstdlib>
  11. #endif
  12.  
  13. int main()
  14. {
  15.  
  16.         for (int units = 10; units > 0; units--)
  17.         {
  18. 	  cout << units;
  19.   	  if (units < 1)
  20.   	  cout << '\r' << "Blast off!\n";
  21.  
  22. 	  cout.flush();
  23.  
  24.           #ifdef __GNUC__
  25.           sleep(1); // one second
  26.           #endif
  27.  
  28.           #ifdef _WIN32
  29.           _sleep(1000); // one thousand milliseconds
  30.           #endif
  31.  
  32.           cout << '\r'; // CR
  33.         }
  34.  
  35.   return 0; 
  36. } // main
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Re: Countdown program

 
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  #6
Mar 14th, 2009
Looks to me like the 0's that are being displayed are from the original 0 in the 10 and that 0 isn't being overwritten and thus remains. Change it so it counts down from 9 to 0 rather than 10 to 0 and see if that extra 0 goes away. Also, temporarily change from displaying '\r' to displaying '\n' and see if it counts down correctly. I think this is a display issue, not a code/loop logic issue. I'm not very familiar with how '\r' displays, nor with how sleep works, but I'd say it has to do with using '\r' rather than '\n'.

On a separate issue, I don't think your "Blast Off" is going to ever print. Try putting it AFTER the countdown loop.
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Re: Countdown program

 
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  #7
Mar 14th, 2009 
#include <iomanip>
#include <iostream>
using namespace std;

#ifdef __GNUC__
#include <unistd.h>
#endif

#ifdef _WIN32
#include <cstdlib>
#endif

int main()
{
  for (int units = 10; units > 0; units--) {
    cout << units;

    if (units < 1)
      cout << "\rBlast off!\n";

    cout.flush();

#ifdef __GNUC__
    sleep(1); // one second
#endif

#ifdef _WIN32
    _sleep(1000); // one thousand milliseconds
#endif

    cout << "\r  \r"; // CR
  }
  return 0; 
} // main
You can erase what's already there with some white-spaces, then print the new number.

Hope this helps.
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Re: Countdown program

 
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  #8
Mar 14th, 2009
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Originally Posted by William Hemsworth View Post 
    cout << "\r  \r"; // CR
You can erase what's already there with some white-spaces, then print the new number.

Hope this helps.
Yep, that's what you want. You still have the "Blast Off" problem, but that'll take care of the 0.
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Re: Countdown program

 
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  #9
Mar 14th, 2009
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Originally Posted by William Hemsworth View Post 
#include <iomanip>
#include <iostream>
using namespace std;

#ifdef __GNUC__
#include <unistd.h>
#endif

#ifdef _WIN32
#include <cstdlib>
#endif

int main()
{
  for (int units = 10; units > 0; units--) {
    cout << units;

    if (units < 1)
      cout << "\rBlast off!\n";

    cout.flush();

#ifdef __GNUC__
    sleep(1); // one second
#endif

#ifdef _WIN32
    _sleep(1000); // one thousand milliseconds
#endif

    cout << "\r  \r"; // CR
  }
  return 0; 
} // main
You can erase what's already there with some white-spaces, then print the new number.

Hope this helps.
Thank you VERY much!
I printed Blast off at the end. It works now!
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Re: Countdown program

 
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  #10
May 30th, 2009
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Originally Posted by blahblah619 View Post
I'm trying to get this countdown to work. I'm trying to get it to countdown from 10 down to "Blast off", with Blast off being 0. Each output replaces the one before it. I'm very confused. 10 does not print, but 9 to Blast off do. When when it Blast off prints, it keeps printing. Does anyone know how I can print 10 and also print Blast off one time?
Please help!
Thanks!

  
 
  
 C++ Syntax (Toggle Plain Text) 
 
 
 
  1. #include <iomanip>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. #ifdef __GNUC__
  6. #include <unistd.h>
  7. #endif
  8.  
  9. #ifdef _WIN32
  10. #include <cstdlib>
  11. #endif
  12.  
  13. int main()
  14. {
  15.   cout << "CTRL-C to exit...\n";
  16.  
  17.       for (int tens = 10; tens > 0; tens--)
  18.       {
  19.         for (int units = 9; units < 10; units--)
  20.         {
  21.           cout << tens << '\r';
  22. 	  cout << ' ' << units;
  23.   	  if (units < 1)
  24.   	  cout << '\r' << "Blast off!\n";
  25.  
  26. 	  cout.flush();
  27.  
  28.           #ifdef __GNUC__
  29.           sleep(1); // one second
  30.           #endif
  31.  
  32.           #ifdef _WIN32
  33.           _sleep(1000); // one thousand milliseconds
  34.           #endif
  35.  
  36.           cout << '\r'; // CR
  37.         }
  38.       }
  39.   return 0; 
  40. } // main
Hi
Well I have tried to modify your program. It's true I don't really know much about some of the code you used and I am considered to be a beginner in programming, but I try. I used only one loop instead of two. And since your in your algorithm each output replaces the one before, the only way to make it look right was to write digits less than 10 as(09, 08, 07,....)
I really hope I helped!

#include <iomanip>
#include <iostream>
using namespace std;
#ifdef __GNUC__
#include <unistd.h>
#endif
#ifdef _WIN32
#include <cstdlib>
#endif
int main()
{
cout << "CTRL-C to exit...\n";
int units = 10;
cout << ' ' << units;
_sleep(1000);
for (units = 9; units >= 0; units--)
{
cout << '\r' << units << '\r';
cout << ' ' << '0' << units << '\r';
if (units == 0)
cout << '\r' << "Blast off!\n";
cout.flush();
#ifdef __GNUC__
sleep(1); // one second
#endif
#ifdef _WIN32
_sleep(1000); // one thousand milliseconds
#endif
cout << '\r'; // CR

}

return 0;
} // main
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