C / C++ Forum

Hi, Another question for today, it's about structs refering to each other. I tried this code struct List; struct child { struct List parent; };

Hi everyone: I was trying to pass a pointer to a structure to a function, where the pointer is pointing to one of the members in the structure, is this possible??? For Example: struct reptile *animalPtr

I'm attempting to adapt some code I got from http://www.inquiry.com/techtips/cpp_pro/10min/10mon0599.asp (line 1 is #include <stdio.h> - see the HTML source). Of course before adapting it, I need to get it working. With GCC I'm getting errors starting on line 4 ('parse error before "NODE"'). This evidently has something to do with the fact...

What do some of you guys prefer? static int foo(void); int main(void) { return foo(); } static int foo(void)

Hello, I want do a program what find the date of the one before day at day what the program run (if today is 20031030, the program will find 20031029). I have the next: #include <stdio.h> #include <time.h> int main() { struct tm *ptr;

Hello, This is my first approach to comp.lang.c, so hello to everyone. I learn c programming from "Teach yourself c " by Aitken & Jones. So far everything is going well and I'm quite excited about being able to write my own simple programs, but I'm stuck at one point. I can't figure out recursion of a function in a simple way. Do you have any...

I usually program in Java, so I am a bit confused about usint pointers in C. I would really appreciate if someone can help me. Case 1: ====== // Is this function no good? Since str is a variable created on stack, // I am assuming it will be deallocated immedately after the function returns, // right?? char * generateString()

Does any body have any "C" code, which there willing to share, that can normalize a tm structure, which goes past the 2038 EPOCH. For example, I have the following tm stucture, which is set to the EPOCH /* Tue Jan 19 03:14:07 2038 */ epoch = { tm_sec = 7

Has anyone worked or have any hints on how to get the Processor Serial Number in C? I've read the material within the Intel(C) webpage, but it only gives me the CPU ID table, no information on where (memory) to get it. Thank you, Leonardo Custodio aliensprite@hotmail.com

I found sizeof in table of Precedence hierarchy for C. is it a operation? which have precedence..?

I'm trying to write a program that will take ROM and show the values. Is that address 0-255? Would this involve malloc or memcpy? How can you alter memory values if you do know how to find them? Bill

Hello, I am curious as to why the designers of C did not include support for Pascal-like nested procedures. I guess that it's because nested procedures in C would not buy you much other than marginally cleaner namespaces, and then again C has a static keyword for limiting the scope of functions to a file, which is not quite the same, but...

Hi I am writing a small calculator program using switch() for a menu. The menu is presented at first, selection read in via scanf(), and calculation is executed. At the end of the operation, the menu is presented again. When it is presented again however, it is printed twice. I've been through the code and cannot spot any obvious errors,...

I came across certain code with lot of declarations like: int foo(const double bar,const int m); I do not see any point in making a non pointer parameter a const, or am I missing something?

The following statement exchanges int a & b. a = (a+b) - (b=a); Is there any trade off here? Thanks.

Hello, I need to write a program that will flash random numbers in the first line of output. The first number flashed will only remain on the screen for about 10 milliseconds. Then another number should appear in the same place 190 milliseconds later. I don't know how to approach the problem of putting the standard output buffer back to...

As part of an assignment I need to calculate a 24 hour time by subtracting a one time from another e.g. if the user enters 1.00 as the time and 1.30 as the time to subtract the returned time is 23.30 the previous day. This is straightforward when dealing with positive times. But when negative times are introduced (as above) it all gets...

Hello, I have to write a program that reads from a text file into a structure. Every line in the file looks like this: "1234","first.last","password" I dont know if there is a function to pass the above line into a structure emp{"1234","first.last","password"}. If this is not the case, what is your suggestion to do the job? Thanks in...

Hi I have assignment for some wierd compression alghoritam that will read in from a file convert characters to 5 bit codes and then write out compressed version of the original file. For example if input file contains string "AMIR" and the codes are A=0, M=12,I=8,R=17 i am supposed to write out 3 byte file The problem? How do I figure...

Hi, everyone I have a problem about malloc/free function. Does malloc add size information to program? And, when free function is called, how this function get the size information? That is, if I request a memory block of size 10, where the size information 10 is stored? To be clear, I have such codes below: int *p = (int *)...

Hi, I am an artist with limited computer knowledge (but I am able to compile some code) who needs for a project I am working on a way to read in a bmp file, loop through the pixels and store their rgb value in a file in the format (x, y, r, g, b). I want to use these values as the basis for some paintings. I looked around on the internet...

I have the following file: bugtest.c I compile it on a RedHat Linux machine, using gcc ehud@localhost ~>gcc --version gcc (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5) Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or...

Here's a program: #include <stdio.h> int main(int argc, char **argv) { double an_array = {0.0, 1.0, 2.0, 3.0, 4.0}; typedef struct a_struct {double v0, v1, v2,v3, v4;} a_type; typedef a_type *a_type_ptr; a_type_ptr s_ptr;

Lvalue Required......Why? Hello all, the following code is not compiling in Turbo C and the error is "Lvalue Required" . main() {

Hi, I've been working on an opensource project for most of this year. The group has adopted the use of macros in place of function calls when wanting to simplify a function. #define get_sensor_values(s1, s2, s3) \ do { \ if(s1>s2) { \ if(s->e != NULL { \ id = s3->id; \ OID defined\n"); \