I'm getting some information about C language and this session of a C book (follow the above link) is using a bad example for me. When I'm trying this example of function returning a pointer, my compiler is stating a warning that I return a pointer to a local variable. I realized that it is error prone after all this variable may be override before the function has done his execution. And the author is fooling me saying that this example is "perfectly safe". I'm wrong? There is something that I don't got yet? Sorry but this site is preventing me to post the link of book cause I'm a newbie, so a need the hack it. Just strip out the question signs:
Code: return ((unsigned int)(unsigned long)base & TBASE_DEFERRABLE_FLAG); What is the above function returning.I am not clear with definition of what is being returned in the above code.
But it's been hell finding an answer, or I just don't know what to look for..I have a prompt that asks for a float, and if the user doesn't put in a valid number, then it should die with an error message.
Code: def die_with_error(): print 'ERROR: You didn't specify a valid number!'
I'm trying to teach myself python (from Learn Python the hardway e-book) but am struggling to grasp the concepts of Classes etc. Part of exercise 43 is to rewrite the game / create a new game with classes for each room etc. So I'll show you my code so far and explain at the bottom my problem
I have a script that i want to add some functionality to, but im new to python. Right now it runs command line as ./script https://server user passwd verbose , which returns alot of informtion. I would like it to be able to only return information for a particular function when a flag is passed. exp: ./script https://server user passwd verbose -m (for memory only)
Under the ClassesToCheck section are the different things that can be retrieved. I would like that when you run the script as ./script https://server user passwd verbose -m, it returns only the 'Memory' info. -c would be for 'CPU', etc... Also, i would like the OK at the end of the script to be the first line that is return in the output instead of the last.
I use a laptop, and frequently plug in to a separate monitor or to a TV screen. I have it set up to to separate X screens. When using my laptop touchpad, I find that once I move to the other monitor or TV screen, I can't return back to my laptop monitor. My USB mouse, however, is able to transition from screen to screen with no problem. I am using ubuntu 10.04 but had the same problem with 8.04 before I upgraded. I have an NVIDIA graphics card, and use the nvidia-settings (which generates the xorg.conf file) to manage the screens. Here is my xorg.conf:
Code: # nvidia-settings: X configuration file generated by nvidia-settings # nvidia-settings: version 1.0 (buildd@crested) Sun Feb 1 20:25:37 UTC 2009 # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 1.0 (buildmeister@builder58) Fri Aug 14 18:33:37 PDT 2009
I have been googling trying to fix this ... basicly I have a (int **) variable, and when I try to pass a (int) value to a specific position, I have seg.fault.Resuming what I have is:
I'm studing and making my first real life program in C++. I've got a doubt related with including a string type into a struct when I'm managing memory allocationdynamically.Bellow I copy the test program I did which works ok. But if I try to use string type instead of "const char *" into the struct I receive a "segment violation" error when I run the program. No error messages when compilling it.Does anybody knows if I'm doing something wrong?
#include <iostream> using namespace std; struct Datos {
how to permanently disable the 'Pointer can be controlled using the keypad' accessibility function?There was a post about it on launchpad, that I used before and since updating to 9.10 I can't find it.It may be a Gnome bug, and its getting very irritating - maybe 10 - 12 times a day...
I am doing some Linux kernel programming for my research project. I need to record the timestamp (by using cpuid and rdtsc) when an interrupt handler (top half) is first invoked. Due to the time critical nature of the problem itself, I have to do the timestamping inside the interrupt handler itself (the first operation when the handler is called). However, I understand that tasks that are not so time critical should be deferred to a tasklet function (bottom half) for processing because other interrupts are disabled in a (top-half) interrupt handler. I am currently out of idea on how I can pass the timestamp information that I have obtained in the interrupt handler to the corresponding tasklet function.
I trying to write a UART(interfacing of serial devices) to linux machine but after I execute the following code to receive data I need to enter key (carriage return).... but I don't want to remove carriage return/enter key
I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.
#!/bin/bash addelementtoarray() { local arrayname=$1
I'm trying to write a simple program that lists a menu and then asks you for your decision, and you can answer with a number or the name. However, I don't know how to add the second options (name).
If I assign the value to the variable line = $(sed -n 8p file.txt)
and now print it out with echo
echo $line
the line would be printed.
But what if the file has only 4 lines. What value would be assigned to the variable line?
I want to know that because I want to only print it if the value is "something", that is not null.
In Java for example I would do it like this... String line = ""; line = reader.readLine(); // or anything else.. if(line!=null){ System.out.println(line); }
How would I check if the value is not "null"(I don't know if bash knows null)
i am having two small issues with a function i have made.sorry if it is a mess, i am still learning bash.the first is calling the nonpersistssh function (second line) and assigning the return value to nonpersistdiag.the function returns 1, but nonpersistdiag seems to only contain 0. i am unsure on how to proceed.the second problem is the nested else clause on line 10. it is a syntactical error. how would i declare it correctly?
Code: function endsession(){ nonpersistdiag=$[nonpersistssh]# a function that returns an exit code sudo /etc/init.d/ssh stop; sshdiag=$?
I want to assign an address location to a pointer and wanted to display the value at that memory location.I wrote a small program for this and it is like this : (i am using gcc 4.4 compiler)
# include "stdio.h" int main() { unsigned int *a; a=(unsigned int *)0x3f8; printf("%u",*a); return 0; }
i am trying to find the size of an array, not by using the array as a parameter to "sizeof", but by using a pointer -pointing to the array- as a parameter. How do i do this?I use a 32-bit PC.Here's:
This is one of the strangest problems I've run into while programming. Maybe there's just something wrong with my version of gcc or something.
The main problem comes at this point in the code:
Code: po = makePoFromScorbotXYZPR(X, Y, Z, P, R); h = makeHB2GFromPo(po); printf("%le", *h[1][0]); //##################################### Here it has the right value printf("%s", "
