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Full Discussion: While loop problem in C
Top Forums Programming While loop problem in C Post 302736853 by Raj 89 on Wednesday 28th of November 2012 04:47:59 AM
Old 11-28-2012
Quote:
Originally Posted by gabam

Code:
 

    int cont = 1;
 
    while( cont == 1 )   
    {
             printf( "Enter i\n" );
             scanf( "%d", &i );
 
             switch( i )
             {
                    case 1:
                              printf( "1\n" );  
                              cont = 0;
                              break;
                    case 2:
                              printf( "2\n" );
                              cont = 0;
                              break;
                    default:
                              printf( "Invalid value" );
             }
    }

Your program is working perfectly fine.I am not able to understand your logic clearly. What is that you are trying to do. You have normally written the while loop in such a way that it will be exited whenever the value of cont is other than 1. So at first the while loop satisfies and the user provides the input for "i".
But when you provide 1 or 2 for the switch case, the value const will be replaced with zero and then the execution goes to while. This will act as an infinite loop till the value of i tends to be other than 1 r 2 .
but if the value of i is other than 1 or 2, cont will be same and the while loop fails the second time.

---------- Post updated at 03:17 PM ---------- Previous update was at 03:15 PM ----------

Quote:
Originally Posted by gabam

Your code is replaced into this. Well this works better.

Code:
 
int main()
{
    int i = 0;
    int cont = 1;
 
    while( cont == 1 ) 
    {
             printf( "Enter i\n" );
             scanf( "%d", &i );
 
             switch( i )
             {
                    case 1:
                              printf( "1\n" );
                              break;
                    case 2:
                              printf( "2\n" );
                              break;
                    default:
                              printf( "Invalid value" );
                              cont = 0 ;
             }
    }
 
    return 0;
}

Maybe this could help you...
 

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ROOTTAIL(1)						      General Commands Manual						       ROOTTAIL(1)

NAME
root-tail - print text directly to X11 root window SYNOPSIS
root-tail [-g|--geometry GEOMETRY] [-fn|--font FONTSPEC] [--color color] [--reload SEC COMMAND] [--shade] [--outline] [--minspace] [--noflicker] [-f|--fork] [--reverse] [--whole] [--partial] [--update] [--cont STRING] [--wordwrap] [--justify] [--noinitial] [--frame] [-id ID] [-i|--interval SECONDS] [-V] file1[,color[,desc]] [file2[,color[,desc]]] DESCRIPTION
Displays a given file anywhere on your X11 root window, i.e. it is kind of tail -f for multiple files using your desktop background as out- put window. All non-option arguments on the command line are files to be logged. A null desc (example: "/var/log/messages,red,") will prevent the printing of a description and the []'s. General Options --color COLOR Use COLOR as default. --font | -fn FONTSPEC Use font FONTSPEC. This can be either a fixed width font like -fn fixed or any font using -fn '-*-*-*-*-*-*-*-*-*-*-*-*-*-*' with the appropriate fields filled out (see xfontsel). Specifying a different FONTSPEC before each filename will cause each file to be displayed in a different font. -f | --fork Forks to the background. --reverse Display the files in reverse order, with the newest lines at the top. --whole Only display whole lines. If the last line of a file doesn't yet end with a newline character then wait until it does before dis- playing it. This is the default if more than one file is being displayed. --partial This is the opposite of the --whole option (see above). It displays lines even if they don't yet have a newline at the end. This is the default if only one file is being displayed. --update Update partial lines 'in place' if they are still on the screen when they are updated in their files. Using --update automatically turns on --partial. --cont STRING When partial lines are broken into two lines in the display, prefix the 2nd line with STRING. Defaults to "|| ". Specify the "--whole" argument to ensure partial lines are never displayed, or specify "--update" to attempt to "repair" broken lines in-place. --cont-color COLOR Use COLOR when displaying the continuation string (as optionally specified with the --cont option above). --wordwrap The default behaviour is to fit as much as possible onto each line of output, even if this means splitting a word between one line and the next. The --wordwrap argument splits lines at spaces if possible. --justify After wrapping long lines, attempt to justify the text to produce a smooth right-hand margin. Implies --wordwrap. --reload SEC COMMAND Re-display the file(s) and run COMMAND every SEC seconds. The default is to never re-display the file(s). --shade Add black shading to the font. --outline Add a black outline to the font (making redraws quite a bit slower). --minspace Use minimum linespace even when using shading or outlining. This might result in leftover pixels (dependign on font and logfile con- tent). --noflicker Use slower but flicker-free update. --noinitial Don't display the end of the file(s) initially. -id ID Use the given window ID for output instead of the root window. -i | --interval SECONDS Use the specified sleeping interval between checks instead of the default 2.4 seconds. Fractional values are OK. -V Print version information. --frame Draw a frame around the selected area. This is useful when trying to find the perfect geometry. EXAMPLE
root-tail -g 800x250+100+50 -font 10x20 /var/log/messages,green -font 12x24 /var/log/secure,red,'ALERT' BUGS
Some desktop environments open a virtual root window and make it difficult to share it. If you cannot see anything after starting root- tail, try to find a setting "allow programs on desktop" or similar, or manually specify a window id. Should you happen to find any bugs please fix them and send me a diff. NOTE: This program was modified by Marc Lehmann <pcg@goof.com>, who couldn't reach the original author. Please direct bug-reports etc. to pcg@goof.com. http://root-tail.plan9.de/ 4.2 Berkeley Distribution 2004-03-27 ROOTTAIL(1)
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