Difference between revisions of "GNU C Programming Notes"

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  the ncurses function halfdelay()
 
  the ncurses function halfdelay()
 +
 +
== getchar() example ==
 +
 +
<nowiki>#include <stdio.h></nowiki>
 +
<nowiki></nowiki>
 +
<nowiki>#define EOL 10</nowiki>
 +
<nowiki>#define ESC 27</nowiki>
 +
<nowiki></nowiki>
 +
<nowiki>main() {</nowiki>
 +
<nowiki></nowiki>
 +
<nowiki>  char c = 'X';</nowiki>
 +
<nowiki></nowiki>
 +
<nowiki>  while (c != ESC) {</nowiki>
 +
<nowiki></nowiki>
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<nowiki>    int cnt;</nowiki>
 +
<nowiki>    cnt++;</nowiki>
 +
<nowiki>    printf("iteration of test %d", cnt);</nowiki>
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<nowiki></nowiki>
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<nowiki>    c = getchar();</nowiki>
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<nowiki></nowiki>
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<nowiki>  }</nowiki>
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<nowiki>  return 0;</nowiki>
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<nowiki></nowiki>
 +
<nowiki>}</nowiki>
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<nowiki></nowiki>
 +
 +
== getputchar() example ==
 +
 +
<nowiki>#include <stdio.h></nowiki>
 +
<nowiki></nowiki>
 +
<nowiki>main() {</nowiki>
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<nowiki>      int c;</nowiki>
 +
<nowiki>      c=getchar(); /*declare c to getchar() for character inputs*/</nowiki>
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<nowiki>      while(c != EOF){</nowiki>
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<nowiki>      putchar(c);</nowiki>
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<nowiki>      c=getchar();</nowiki>
 +
<nowiki>      }</nowiki>
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<nowiki>}</nowiki>
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<nowiki></nowiki>
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 +
==
  
 
== References ==
 
== References ==

Revision as of 18:36, 20 June 2007

Text Notes Document for Gnu C Programming


getchar() and loop control

C program that needs to attend the user input without blocking a loop depends on which environment you're coding: raw-C for the glass-tty, curses/termcap, X, KDE, Gnome, etc. 

the ncurses function halfdelay()

getchar() example

#include <stdio.h>

#define EOL 10
#define ESC 27

main() {

  char c = 'X';

  while (c != ESC) {

    int cnt;
    cnt++;
    printf("iteration of test %d", cnt);

    c = getchar();

  }
  return 0;

}

getputchar() example

#include <stdio.h>

main() {
       int c;
       c=getchar(); /*declare c to getchar() for character inputs*/
       while(c != EOF){
       putchar(c);
       c=getchar();
       }
}

==

References

  • Introduction to ANSI C (on linux)
http://www.linuxuniversity.org/dev_track/c_class/
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