C / C++ Forum

Hi people I have been working again in my tutorial, and I have finished the "types" chapter. If you feel like "jacob bashing" this is the occasion! I am asking for criticisms, or for things I may have said wrong. Keep in mind that this is a tutorial, and I donot want to overwhelm the reader with little details. ...

What is better for holding small numbers in a program? I know that char uses less memory, but, with 32 or 64 bits systems, there are advantages (such as processing time) in using int instead of char for small numbers? Luis

I was reading the code of FFmpeg and it seems that they use malloc just too much. The problems and dangers of malloc are widely known. Malloc also has some overhead (although I don't know what is the overhead of automatic variable sized arrays, I suspect it is smaller than that of malloc), although I'm not too worried about it. I was...

This might be less of a design issue than a C++ language issue per se, but I have a problem with assertions. I mean, they work, of course. But there's something I'm uncomfortable with that's never been explained to my satisfaction. I recently read this explanation. "There is an effective litmus test to differentiate the cases in which you...

Hi, I have been asked to teach a short course on testing in C++. Until now I have used my own testing classes (which from what I've seen seem similar to the boost unit testing classes). Considering I have a limited amount of time what do readers of this group think would be useful to cover in this course? Is boost the way to go? Sorry if...

Hi All, When I run the below program in MSVC, I get the output as 1 4 Could you tell me why sizeof 'A' is taken as 4? Is it standard defined or compiler specific? Thanks, Nishu /**************************************/ #include<stdio.h>

is there any way to find out number of bytes freed on a particular free() call in C

I'm getting back into C++ after a long hiatus (they didn't have namespaces back then). I know this question is completely subjective, but I'd be interested in hearing which is the "better" style and what the pros and cons are (I'm using cout as example, but it really applies to any similar construct): 1) using std::cout;

C/C++ language proposal: Change the 'case expression' from "integral constant-expression" to "integral expression" The C++ Standard (ISO/IEC 14882, Second edition, 2003-10-15) says under 6.4.2(2) : case constant-expression : I propose that the case expression of the switch statement be changed from "integral constant-expression" to...

I've been using C for some time now and I would like to take my first leap into C++. I should warn you that I have little or no experience with visual C++, though I do have some experience with different OOP languages. I am using Microsoft Visual C++ 6.0. I would like to create a very simple program to begin with: A dialog box, say...

I have a C question that may be OT so if no one wants to respond that's their perogative. Using standard C as a base. How can one begin to build a GUI system? Obviously there must be access to memory IO and the System calls of the OS if not the kernel. I mean from scratch not from a layer another developer has designed though that may be...

Hi ! I was wondering how to quickly and safely use a safe scanf( ) or gets function... I mean.. if I do : char a; scanf("%s", a); and the user input a 257 char string.. that creates a problem.. same for gets.. even if you create a char array that's 99999999999999 char long.. if the user input something longer it will still be a...

A colleague of mine is proposing that we use a set of preprocessor definitions to make our C code more readable: #define BEGIN { #define ENG } #define EQ == etc. My initial reaction is "Yuck!" (Not too different from the FAQ, which just says "Bleah").

Hi, I am writing a linked list in the following way. struct list { struct list *next; char *mybuff; };

hello, i'm trying to understand what are the rules for determining when an expression is well defined or not. i found a page (http://c-faq.com/expr/seqpoints.html) which seems to explain this well enough. first of all some terms: * object = variable, element of an array, location pointed by a pointer * modification = assignment ( = +=...

i am trying to print the address of a function without getting a compiler warning (i am compiling with gcc with alot of flags). if i try this: printf("%p", f); i get: warning: format %p expects type 'void *; but argument 2 has type 'void

Hi, It came up in a standards panel meeting the other day that "all c or C++ programmers" have a copy of ISO C and/or C++ ... I challenged this and said most don't (outside those working on the standards). Well, do most of you have a copy of the relevant ISO language standard of your own or is there one on your desk at work?

I wrote a program to calculate factorials of large numbers. The long precission integers are stores in arrays. When i specify the length of these arrays larger than 16000 elements, each element is a long int, the windows refuses to execute the program. More precicely the code terminates as soon as it starts to execute. How can i overcome this...

why array can't be assigned, like structs?

Hi All, I have been struggling with this for a few hours. The exercise is a variation on the RPN calculator, asking to use scanf or sscanf for input. I have included the ( partially completed) code below, but this is the puzzle. ( It's from my old standby Tondo and Gimpel) Firstly, it compiles with out any errors!!!

We have discussed this program a lot. Only two problems have remained with this code: /* a function written in ANSI C, that takes a word from stdin and manages the memory dynamically * * Since there is no generally agreed definition of what a 'word' is. I have taken a very simple * approach: *

I've been using C for some time now and I would like to take my first leap into C++. I should warn you that I have little or no experience with visual C++, though I do have some experience with different OOP languages. I am using Microsoft Visual C++ 6.0. I would like to create a very simple program to begin with: A dialog box, say...

I am presently working in C++ .It is flexible and efficient.But it is not the reasons for the language to survive as hardware is running ahead the capabilities of software(why efficiency?).Java is a cool language and .NET too even for mobile devices and embedded systems.Anybody can give some valid reasons so that I can understaand C++ will...

Frinds, Hope everyone is doing fine.i feel pointers to be the most toughest part in C. i have just completed learning pointers & arrays related portions. I need to attend technical interview on C. wat type of questions should be expected? Which part of C language do the staff give more concern? The interviewers have just mentioned that .....

I just fixed a bug that some of the correctness pedants around here may find useful as ammunition. The problem was that some code would, very occasionally, die with a segmentation violation error. (Not as infrequent as some bugs that have been discussed here in the past, but maybe once in an overnight run of the program when it was...