Saying code like that "depend[s] on undefined behavior" is too kind. Anyone who writes code that assumes the location of a variable based on the location of another variable is bat-!*()% crazystupid.
FWIW, multiple definitions on one line are a bad idea for other reasons, too.
What's this mean:
declares an object of type pointer to char named ptrA and an object of type char named ptrB. It also means that I will never hire the programmer that wrote this. Either they don't understand the rules of C or C++, or they don't understand that you shouldn't name a variable ptrx unless that variable is declared to be a pointer type (unless they're entering some kind of code obfuscation contest).
There is nothing wrong with declaring multiple objects with a single declaration (whether or not it is on one line or spread across several lines).
When writing code, use a set of style guidelines and be consistent. And if the guidelines you use aren't "common practice", make sure that anyone who will ever need to maintain your code also has a pointer to a written set of the guidelines used.
Is it possible, and if so, how can I assign a static IP address to my RedHat 8.0 machine. I am using a Linksys router/switch with DHCP enabled. I have a small linux/windows2000 LAN at home. I want to assign a static IP so that I can setup port forwarding to my linux machine so that I can ssh into... (7 Replies)
Hi
I want to know when and where memory for static variables are allocated in a C program. If it allocates during compilation will memory be allocated for the variable "i" during compilation itself.
int count();
int main(){
printf("%d", count());
return 0;
}
int count()
{
... (8 Replies)
Hello everybody,
I am having problem in converting byte array variables to Hexa String variables for Linux. I have done, converting byte array variables to Hexa String variables for Windows but same function doesn't work for linux. Is there any difference in OS ? The code for Windows is given... (2 Replies)
Hi all,
Sorry I make a mistake,the title should be "How to statistic the average value "
I do five times about "mv 123 to 456"
and do five times about "mv 456 to 123"
As we know,"time" can get the real usr sys value,
I want to get the average real,usr,sys of "mv 123 to 456" and "mv 456 to... (4 Replies)
hello, i need help on setting my coyote linux, i've working on this for last 5 days, can't get it to work. I've been posting this message to coyote forum, and other linux forum, but haven't get any answer yet. Hope someone here can help me...... please see my attached picture first.
... (0 Replies)
I have some static library(libxxx.a libyyy.a).
And I want to generate my library(libzzz.a), libzzz.a will use libxxx.a and libyyy.a
I wan't my application only use libzzz.a, (means libzzz.a had include libxxx.a, libyyy.a), how can I do that? Thank you.
example:
I have zzz.c.
I do ... (4 Replies)
I'm writing a program which uses curl to be run on Linux PCs which will be used by a number of different users. I cannot make the users all install curl on their individual machines, so I have tried to link curl in statically, rather than using libcurl.so. I downloaded the source and created a... (8 Replies)
Hi,
Can anyone explain this please..... This is on AIX with GDB (tried a few versions). It only happens when program compiled in 64 bit and only with static variables....
A simple test program...
### snip
#include <stdio.h>
main() {
static int n;
n = 6;
printf("hello %d\n", n);... (0 Replies)
Discussion started by: bagpussnz
0 Replies
LEARN ABOUT REDHAT
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1)NAME
ppmtosixel - convert a portable pixmap into DEC sixel format
SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC
LJ250 color inkjet printer.
If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table
begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file.
OPTIONS -raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com-
pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni-
tude larger than a compressed file and prints much slower.
-margin
If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci-
fied, a 1.5 inch left margin will offset the image.
PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?.
BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was
greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the
color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation.
SEE ALSO ppm(5)AUTHOR
Copyright (C) 1991 by Rick Vinci.
26 April 1991 ppmtosixel(1)