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2

I'm attempting to create a game of life program in C, but i'm not very familiar with a process to update the output displayed on the terminal.

So, for example, I will have a 2d char array, where each element will contain either a '#' or a '-'. I will print this array onto the screen, but rather than printing a new 2d array every time there is a state change, I want to overwrite the old array in the terminal with the new state.

I have looked for ways to do this, but haven't had much luck. The closest I have found is a carriage return in the printf function (r), but hopefully someone can tell me the best way to do this.

Specifically, how could I print out a 2d array on the screen, change the elements of the array, and print out the new array ON TOP of the old one, ie, overwrite it.

c arrays linux printf output

share|improve this question

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Do you have a specific question?
  
  – this
  Apr 21 '14 at 20:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have updated the question
  
  – syco_link
  Apr 21 '14 at 20:27
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What do you mean by on top?
  
  – this
  Apr 21 '14 at 20:27
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Windows, Linux, iOS... ?
  
  – ryyker
  Apr 21 '14 at 21:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, Linux platform
  
  – syco_link
  Apr 21 '14 at 21:27
  

  
  
  
  

 | 
show 1 more comment

2

I'm attempting to create a game of life program in C, but i'm not very familiar with a process to update the output displayed on the terminal.

So, for example, I will have a 2d char array, where each element will contain either a '#' or a '-'. I will print this array onto the screen, but rather than printing a new 2d array every time there is a state change, I want to overwrite the old array in the terminal with the new state.

I have looked for ways to do this, but haven't had much luck. The closest I have found is a carriage return in the printf function (r), but hopefully someone can tell me the best way to do this.

Specifically, how could I print out a 2d array on the screen, change the elements of the array, and print out the new array ON TOP of the old one, ie, overwrite it.

c arrays linux printf output

share|improve this question

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Do you have a specific question?
  
  – this
  Apr 21 '14 at 20:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have updated the question
  
  – syco_link
  Apr 21 '14 at 20:27
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What do you mean by on top?
  
  – this
  Apr 21 '14 at 20:27
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Windows, Linux, iOS... ?
  
  – ryyker
  Apr 21 '14 at 21:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, Linux platform
  
  – syco_link
  Apr 21 '14 at 21:27
  

  
  
  
  

 | 
show 1 more comment

I'm attempting to create a game of life program in C, but i'm not very familiar with a process to update the output displayed on the terminal.

So, for example, I will have a 2d char array, where each element will contain either a '#' or a '-'. I will print this array onto the screen, but rather than printing a new 2d array every time there is a state change, I want to overwrite the old array in the terminal with the new state.

I have looked for ways to do this, but haven't had much luck. The closest I have found is a carriage return in the printf function (r), but hopefully someone can tell me the best way to do this.

Specifically, how could I print out a 2d array on the screen, change the elements of the array, and print out the new array ON TOP of the old one, ie, overwrite it.

c arrays linux printf output

share|improve this question

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

share|improve this question

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

share|improve this question

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

edited Mar 26 at 2:32

jww

56.3k4242 gold badges249249 silver badges540540 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

asked Apr 21 '14 at 20:19

syco_linksyco_link

6699 bronze badges

2 Answers
2

active

oldest

votes

1

(some of these links, code snippets are Linux, and others are Windows)
Given your specific questions, (and assuming you do know how to write an array to the console) :

1) write the first array.
2) Then Clear The Console (or over write the console)

Something like this:

#include <stdlib.h>

void main()

 system("cls");
 

Or write the following to stdout: (Linux)

write(1,"E[HE[2J",7);

which is what /usr/bin/clear does except it does not create another process.
Or both:

 void clear_screen()
 
 #ifdef WINDOWS
 system ( "CLS" );
 #else
 // Assume POSIX
 system ( "clear" );
 #endif
 

More Options Here

3) write the next array

share|improve this answer

edited Apr 21 '14 at 21:43

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ryyker, apologies for not commenting sooner, have been at work. This looks like it might be exactly what i've been looking for! I will try this out later and tick the solution if all good. Thanks :)
  
  – syco_link
  Apr 22 '14 at 1:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @syco_link - Yes, that work thing kind of gets in the way sometimes.
  
  – ryyker
  Apr 22 '14 at 14:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Cleared the screen perfectly, exactly what I was after! Is there any chance you could explain the expression in the write function, or point me towards some documentation for it? Thank you!
  
  – syco_link
  Apr 22 '14 at 21:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Search for "EHE[2J" [HERE. It is essentially shell scripting. Lots written on it, very useful.
  
  – ryyker
  Apr 22 '14 at 21:52
  
  

  
  
  
  

add a comment | 

0

You can try something like this:

#include<stdio.h>

int main(void)


printf ("#####-----r");
printf ("-#####----r");

Not sure if I really answered your question. And if this is not your answer then you are definitely looking for something like ncurses.

share|improve this answer

edited Apr 21 '14 at 20:36

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, the array is 2d so it might be a 10 x 10 grid on the terminal. As far as i'm aware r will only deal with one line and no more, but I shall look into ncurses, thanks!
  
  – syco_link
  Apr 21 '14 at 21:28
  
  

  
  
  
  

add a comment | 

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1

(some of these links, code snippets are Linux, and others are Windows)
Given your specific questions, (and assuming you do know how to write an array to the console) :

1) write the first array.
2) Then Clear The Console (or over write the console)

Something like this:

#include <stdlib.h>

void main()

 system("cls");
 

Or write the following to stdout: (Linux)

write(1,"E[HE[2J",7);

which is what /usr/bin/clear does except it does not create another process.
Or both:

 void clear_screen()
 
 #ifdef WINDOWS
 system ( "CLS" );
 #else
 // Assume POSIX
 system ( "clear" );
 #endif
 

More Options Here

3) write the next array

share|improve this answer

edited Apr 21 '14 at 21:43

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ryyker, apologies for not commenting sooner, have been at work. This looks like it might be exactly what i've been looking for! I will try this out later and tick the solution if all good. Thanks :)
  
  – syco_link
  Apr 22 '14 at 1:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @syco_link - Yes, that work thing kind of gets in the way sometimes.
  
  – ryyker
  Apr 22 '14 at 14:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Cleared the screen perfectly, exactly what I was after! Is there any chance you could explain the expression in the write function, or point me towards some documentation for it? Thank you!
  
  – syco_link
  Apr 22 '14 at 21:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Search for "EHE[2J" [HERE. It is essentially shell scripting. Lots written on it, very useful.
  
  – ryyker
  Apr 22 '14 at 21:52
  
  

  
  
  
  

add a comment | 

1

(some of these links, code snippets are Linux, and others are Windows)
Given your specific questions, (and assuming you do know how to write an array to the console) :

1) write the first array.
2) Then Clear The Console (or over write the console)

Something like this:

#include <stdlib.h>

void main()

 system("cls");
 

Or write the following to stdout: (Linux)

write(1,"E[HE[2J",7);

which is what /usr/bin/clear does except it does not create another process.
Or both:

 void clear_screen()
 
 #ifdef WINDOWS
 system ( "CLS" );
 #else
 // Assume POSIX
 system ( "clear" );
 #endif
 

More Options Here

3) write the next array

share|improve this answer

edited Apr 21 '14 at 21:43

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ryyker, apologies for not commenting sooner, have been at work. This looks like it might be exactly what i've been looking for! I will try this out later and tick the solution if all good. Thanks :)
  
  – syco_link
  Apr 22 '14 at 1:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @syco_link - Yes, that work thing kind of gets in the way sometimes.
  
  – ryyker
  Apr 22 '14 at 14:58
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Cleared the screen perfectly, exactly what I was after! Is there any chance you could explain the expression in the write function, or point me towards some documentation for it? Thank you!
  
  – syco_link
  Apr 22 '14 at 21:35
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Search for "EHE[2J" [HERE. It is essentially shell scripting. Lots written on it, very useful.
  
  – ryyker
  Apr 22 '14 at 21:52
  
  

  
  
  
  

add a comment | 

(some of these links, code snippets are Linux, and others are Windows)
Given your specific questions, (and assuming you do know how to write an array to the console) :

1) write the first array.
2) Then Clear The Console (or over write the console)

Something like this:

#include <stdlib.h>

void main()

 system("cls");
 

Or write the following to stdout: (Linux)

write(1,"E[HE[2J",7);

which is what /usr/bin/clear does except it does not create another process.
Or both:

 void clear_screen()
 
 #ifdef WINDOWS
 system ( "CLS" );
 #else
 // Assume POSIX
 system ( "clear" );
 #endif
 

More Options Here

3) write the next array

share|improve this answer

edited Apr 21 '14 at 21:43

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

#include <stdlib.h>

void main()

 system("cls");
 

write(1,"E[HE[2J",7);

 void clear_screen()
 
 #ifdef WINDOWS
 system ( "CLS" );
 #else
 // Assume POSIX
 system ( "clear" );
 #endif
 

share|improve this answer

edited Apr 21 '14 at 21:43

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

answered Apr 21 '14 at 21:07

ryykerryyker

13k22 gold badges2929 silver badges6161 bronze badges

0

You can try something like this:

#include<stdio.h>

int main(void)


printf ("#####-----r");
printf ("-#####----r");

Not sure if I really answered your question. And if this is not your answer then you are definitely looking for something like ncurses.

share|improve this answer

edited Apr 21 '14 at 20:36

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, the array is 2d so it might be a 10 x 10 grid on the terminal. As far as i'm aware r will only deal with one line and no more, but I shall look into ncurses, thanks!
  
  – syco_link
  Apr 21 '14 at 21:28
  
  

  
  
  
  

add a comment | 

0

You can try something like this:

#include<stdio.h>

int main(void)


printf ("#####-----r");
printf ("-#####----r");

Not sure if I really answered your question. And if this is not your answer then you are definitely looking for something like ncurses.

share|improve this answer

edited Apr 21 '14 at 20:36

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, the array is 2d so it might be a 10 x 10 grid on the terminal. As far as i'm aware r will only deal with one line and no more, but I shall look into ncurses, thanks!
  
  – syco_link
  Apr 21 '14 at 21:28
  
  

  
  
  
  

add a comment | 

You can try something like this:

#include<stdio.h>

int main(void)


printf ("#####-----r");
printf ("-#####----r");

Not sure if I really answered your question. And if this is not your answer then you are definitely looking for something like ncurses.

share|improve this answer

edited Apr 21 '14 at 20:36

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges

#include<stdio.h>

int main(void)


printf ("#####-----r");
printf ("-#####----r");

share|improve this answer

edited Apr 21 '14 at 20:36

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges

answered Apr 21 '14 at 20:30

bubblebubble

1,77944 gold badges2424 silver badges4848 bronze badges