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Top Forums UNIX for Dummies Questions & Answers Ksh How to test if variable is numeric?? Post 302183651 by era on Wednesday 9th of April 2008 03:05:45 PM
Old 04-09-2008
Code:
case $zipcode in [0-9][0-9][0-9][0-9][0-9]) ;;
    *) echo "$myline"; echo "zipcode warning: $zipcode" >&2;;
esac

If it's five digits then it can't be bigger than 99999 or less than 00000, so that check seems superfluous. Also you seem to have a logic error there (it cannot be less than one and bigger than 99999). The check for bigger than 0 still needs to be done but it complicates things a bit so I didn't want to dilute this example with the handling of that.

Last edited by era; 04-09-2008 at 04:11 PM.. Reason: make it more similar to original
 

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get_desktop_resolution(3alleg4) 				  Allegro manual				   get_desktop_resolution(3alleg4)

NAME
get_desktop_resolution - Finds out the desktop resolution. Allegro game programming library. SYNOPSIS
#include <allegro.h> int get_desktop_resolution(int *width, int *height); DESCRIPTION
Finds out the currently selected desktop resolution. You can use this information to avoid creating windows bigger than the current resolu- tion. This is especially important for some windowed drivers which are unable to create windows bigger than the desktop. Each parameter is a pointer to an integer where one dimension of the screen will be stored. Under some OSes, switching to a full screen graphics mode may automatically change the desktop resolution. You have, therefore, to call this function before setting any graphics mode in order to retrieve the real desktop resolution. Example: int width, height; allegro_init(); ... if (get_desktop_resolution(&width, &height) == 0) { /* Got the resolution correctly */ } RETURN VALUE
Returns zero on success, or a negative number if this information is not available or does not apply, in which case the values stored in the variables you provided for `width' and `height' are undefined. SEE ALSO
desktop_color_depth(3alleg4), set_gfx_mode(3alleg4) Allegro version 4.4.2 get_desktop_resolution(3alleg4)
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