C / C++ Forum

Hi fellows, I am reading some books to learn the C programming language, and sometimes I have the feeling that when somebody becomes a C expert, he must learn a more modern and object-oriented language. When I read things like "... C++ is an evolution of C ..." or "... C is a subset of C++ ..." I tend to believe that I will have to learn...

Do you prefer malloc or calloc? p = malloc(size); Which of the following two is right to get same storage same as the above call? p = calloc(1, size); p = calloc(size, 1);

what is an escaping variable?

Hi, For this code snippet, I get the following output, which I am unable to understand. (2^31 = 2147483648) cout<< -2147483648 << endl; cout << numeric_limits<int>::min() <<',' << numeric_limits<int>::max()<< endl;

Hi, Is there any efficient way of finding the intesection point of two singly linked lists ? I mean to say that, there are two singly linked lists and they meet at some point. I want to find out the addres of the node where the two linked intersect. thanks for any help...

I've see in some code: #ifdef __cplusplus extern "C" { #endif what does it mean? Thanks

Hello, traditionally, in C++, dynamically allocated memory has been managed explicitly by calling "delete" in the application code. Now, in addition to the standard library strings, containers, and auto_ptrs, gurus suggest that may be better to use a reference-counted smart pointer, or a garbage-collector. But in which cases it is better...

Hi, the following is actually a part of the pattern matching program which i tried ,memset is not setting the entire integer array with -1 #include <string.h> #include <stdio.h> #include <stdlib.h>

I have heard that return -1 is not portable. So what would be the answer to portability in this case? What about exit(0) and exit (-1) or exit (1)? Or would it be best to stick with C's macros, hence: exit(EXIT_FAILURE) exit (EXIT_SUCCESS) Bill

This came up in a job interview, what is the output of the program below? I tried to compile and run it myself, but my compiler (lcc-win32) aborts with this errors.... Warning test2.c: 3 old-style function definition for 'main' Warning test2.c: 3 missing prototype for 'main' Warning test2.c: 3 ' Error test2.c: 3 compiler error in...

Hello, I realise that I just dont get this, but I cannot see the need for auto_ptr. As far as I have read, it means that if you create an object using an auto_ptr, instead of a raw pointer, then the object will get cleaned up when the method/function ends. Isn't this what happens if you just declare an object without using a pointer at all?...

This is a purely *hypothetical* question. That means, it's /pretend/, CP. ;-) If you were forced at gunpoint to put all your code in classes, rather than in namespace scope (obviously classes themselves are an exception to this), and 'bootstrap' your program by instantiating a single application object in main(), would that place any...

Hi, 1. Any faster method (other than for-loop) to initialize array? 2. Does there have similar C++ function to replace C's "fprintf"? Thanks. Pat

Hi, (I realise this probably isn't precisely the right group for this - could someone direct me to the appropriate group to post this question? - thanks !) I'm using Visual C++ 2005 Express Edition Beta (free download from MS - hooray!), and everything works fine, except I get warnings back on the use of some functions, strlen() for...

I'm suprised no one suggested a union! #include <stdio.h> union _x { long lng; char byt; } X; void main( void )

K&R pg.66 describes two situations when using goto makes sense. Has anyone here come across situations where using goto provided the most elegant solution. -- http://www.kashmiri-pandit.org/atrocities/index.html

Hello, Does anyone have any suggestions for where to find a good sincos routine (i.e. a routine that calculates both the sin and cos of a given argument) written in c? Thanks, OcelotIguana@yahoo.com

Some people prefer to use "if (x & 1)" to see if a number is odd or even. Is this completely portable according to the standard?

Hi, I have this function to reverse the given string. I am just curious if that is correct and there could be better way of doing it / probable bugs in the same. The function prototype is similar to the one in any standard C library. <---- Code starts -->

I know this is a religious issue, and I hope this thread doesn't degenerate, but I am curious about the pros and cons of swapping the operands of ==. The only pro of putting the constant on the LHS that I know of is that it protects against an accidental assignment where a test for equality was intended. But the advantage above only...

I would like to overload a C function. Is there any easy way to do this?

What is wrong in the below code, I get the 2 error when i compile the prog... what is mean ?? error C2275: structure: illegal use of this type as an expression error C2065: str: undeclared identifier typedef struct {

Hi, I am fairly new to C and all the C books I got talk about gets() but when I compile it says I should not use gets() because it is dangerous. I understand that it is dangerous because it doesn't check whether there is more characters entered by the user the what can be stored but I don't know what the safe equivalent of gets() is. ...

I was just reading another post when someone commented that the code was C and not C++. What are the differences? (Examples?) The answer does not affect my programming but would help to know if I need to post a question.

Hi all,can you please tell the most efficient method to reverse a byte.Function should return a byte that is reversed.