questions about c

write data to register

i have the memory address of certain register(the address LCDCW1 is C000). c codes: #define LCDCW1 0xC000 *LCDCW1=0x31; i just want to write data to this register. The codes have problems, how to correct it? thx! ...

c

pointers

embedded

hardware

register

Store a signed long int (32bit) as 4 octets?

I managed to get a unsigned long int octets-representation (BE) by reading IPv4 methods, and I managed to read about how signed integers are using the MSB as the sign indicator, which makes 00 00 00 00 to be 0, while 7F FF FF FF is 2147483647. But I can't manage how to do the same for signed long integers? #include <stdio.h> #include <...

c

Can anyone give me tips how to solve this using Graphs in C or Java?

Can anyone give me tips how to solve this using Graphs in C or Java? I have a rectangular sector, that I have to escape, and I have energy that goes disappear every step that i give in the area. I have to give the only one possible solution, the one that uses the least number of steps. If there are at least two sectors with the same nu...

java

c

graph

Enum values doubts?

Is there any possible way to do any arithmetic operations on enum values? enum Type{Zero=0,One,Two,Three,Four,Five,Six,Seven,Eight,Nine}; main() { enum Type Var = Zero; for(int i=0;i<10;i++) { switch(Var) { case Zero: /*do something*/ case One: /*Do so...

c

enums

extern and global in c

Can anyone please tell me is there any special requirement to use either EXTERN or GLOBAL variables in a C program? I do not see any difference in a program like below, if I change from gloabl to extern. #include <stdio.h> #include <stdlib.h> int myGlobalvar = 10; int main(int argc, char *argv[]) { int myFunc(int); int i; i = 12;...

c

variables

extern

C socket programming: connect() hangs

FINAL EDIT: the code has been fixed to reflect changes. Thanks to all of you!! Hey all, I'm about to rip my hair out. I have this client that tries to connect to a server, everything seems to be fine, using gethostbyname(), socket(), bind(), but when trying to connect() it just hangs there and the server doesn't see anything from the c...

c

connection

client-server

Gtk, How to update GtkViewPort with GtkVBox.

I am having one GtkVbox and I am adding it to GtkViewPort. View port is created from Glade file. Now the problem is that my vbox keeps updating on every second (I keep adding widgets to vbox on every second) this vbox but my screen did not get updated as add widgets to my vbox. I can't create new vbox every time as I need to keep previ...

c

gtk

gtk+

can anyone help me with this macro?

Anyone can explain in details what the following macro does? #define write_XDATA(address,value) (((char *)0x010000) [address]=value) thx! ...

c

macros

GCC Linking time errors - No rule to make target

Hi Guys, I'm new to the world of Makefile writing. I have a C project which I want to build using GCC and I could write fairly a very good Makefile, which calls 3 other Makefiles, present in different directory structure of the project, recursively, who will then send the respective source files to the GCC compiler. The result of ...

Stringification of a macro value

I faced a problem - I need to use a macro value both as string and as integer. #define RECORDS_PER_PAGE 10 /*... */ #define REQUEST_RECORDS \ "SELECT Fields FROM Table WHERE Conditions" \ " OFFSET %d * " #RECORDS_PER_PAGE \ " LIMIT " #RECORDS_PER_PAGE ";" char result_buffer[RECORDS_PER_PAGE][MAX_RECORD_LEN]; /...

how to compile a program with gtkmozembed.h

Hi, i have written a program under ubuntu, in which i include gtkmozembed.h. I am facing a problem in compiling the program.Below is the simplest form of a program which uses gtkmozembed. #include <gtk/gtk.h> #include <stdio.h> #include <gtkmozembed.h> int main(){ GtkWidget *mozEmbed; mozEmbed = gtk_moz_embed_new();...

Without LIB And String file how can i write this code??

#include<stdio.h> #include<conio.h> #include<stdlib.h> #include<string.h> struct Node; typedef struct Node * PtrToNode; struct Node { char element; PtrToNode Next; }; PtrToNode MakeEmpty(PtrToNode L) { L= new(Node); L->Next=NULL; return L; } void Push(PtrToNode L,char x) { PtrToNode S; S= new(Node); S-...

c

Checking for a variable in the executable

Is there a way to know whether a variable is defined, by looking at the executable. Lets say I declare int i; in the main function. By compiling and linking I get an executable my_program.exe. Now, by looking inside my_program.exe, can I say if it has an int eger variable i ? ...

Reliably converting C preprocessor macros to python code

Hi, I have a bunch of C macros the operation of which I need to simulate in python. I saw some pointers to pygccxml or ctypeslib etc. Are these the ways to go ? Or is there something out there that is better ? The C macros if and when they change, I would like the python implementation to be auto generated rather than having to make ma...

python

c

preprocessor

How can char* be a condition in for loop?

In a book I am reading there is a piece of code : string x; size_t h=0; for(const char* s=x.c_str();*s;++s) h=(h*17)^*s; Regarding this code, I have two questions: how can *s be a condition? what does it mean? what does "h=(h*17)^*s" mean? Thanks for help! ...

c++

c

I make this for balancing paranthesis of equation but i think it is wrong check and correct it

int main(){ char i,input[30],close,open; for(i=0;i<='.';i++){ printf("enter equation"); scanf("%c",input[i]); if(input[i]=='(') input++; input[i]=open; else if(input[i]==')') input[i]--; input[i]=close; else if(open[i]==close[i]) { printf("paranthesis are balance"); } else printf("paranthesis are not balance"); } getch(); return 0; } ...

c

how to implement word count bash shell

hey guys. I am trying to write my own code for the word count in bash shell. I did usual way. But i wanna use pipe's output to count the word. So for eg the 1st command is cat and i am redirecting to a file called med. Now i have to use to 'dup2' function to count the words in that file. How can i write the code for my wc? This is th...

c

How is PI calculated?

I want to make a function in C that can return PI to X places.. I'm just not sure how... Thanks Edit: I don't care how slow it is I really just want an algorithm that will return PI at X decimal... Iv been looking at http://bellard.org/pi/ but I don't understand how to get the nth of Pi from this. Thanks ...

Strange problem when converting RGB to HSV

Hi, I made a small RGB to HSV converter algorithm with C. It seems to work pretty well, but there is one strange problem: If I first convert i.e. a 800x600 picture into HSV map and then back to RGB map without doing any changes in the values, I get some pixels that are convertet incorrectly. Then if I try to convert those misbehaving si...