C / C++ Forum

hi, after some weeks of development of a project, there likely are many "#include" in source files which was added before but are now unnecessary. is there any tool which can find out those "#include"s and tell me it's safe to remove them? manual work is so time consuming. thanks. - woody

In the function below, can size ever be 0 (zero)? char *clc_strdup(const char * CLC_RESTRICT s) { size_t size; char *p; clc_assert_not_null(clc_strdup, s); size = strlen(s) + 1;

Some programmers treat arrays just like pointers (and some even think that they're exactly equivalent). I'm going to demonstrate the differences. Firstly, let's assume that we're working on a platform which has the following properties: 1) char's are 8-Bit. ( "char" is synomonous with "byte" ). 2) int's are 32-Bit. ( sizeof(int) == 4 )....

Can you give any comments on this code? I used one goto, is it bad? #include <stdio.h> #include <stdlib.h> #include <ctype.h> #include <string.h> #include <assert.h> #define NOT_NULL 1

I previously had asked if there was an online standards file so I could read that and answer my own questions without posting here and getting flamed for not having done my homework. I was pointed to a file called n1124.pdf which turns out to be a C99 standard. It appears that quoting from that standard makes a lot of people say "but C99...

This is an interview question and I gave out my answer here, could you please check for me? Q. What are the memory allocation for static variable in a function, an automatic variable and global variable? My answer: static variable in function and global variable are allocated in head, and automatic variable is allocated in stack. Right?

A proposed new function int alias(void *ptr1, size_t len1, void *ptr1, size_t len2) Returns true if the pointers overlap. On most machines it can be trivially implemented. However it has to be a standard library function because it is not necessarily legal to compare two address from different objects.

I saw this question from www.brainbench.com void *ptr; myStruct myArray; ptr = myArray; Which of the following is the correct way to increment the variable "ptr"? Choice 1 ptr = ptr + sizeof(ptr);

Sorry to bother you, but I just have to. What about strdup()? It wasn't in standard C run-time library, yet many apps use it liberally as it was in there. I don't know if that particular function is included in C99. Not too difficult to code own version of it, but why it wasn't included in library in the first place? Is there some...

Hi all, I would like to know how all of you learned C. Was it books, Internet, human mentor, class or other? later, charles.....

Could someone please help me understand p 119 of K&R? This is a version of qsort that, depending on a command line optional argument ( -n) sorts lines numerically vs lexicographically. I think the relevant lines ( well, the ones I am having a problem with) are as follows. # include.....

Hi, In java, there is an 'indexOf' function in String which does this: indexOf(String str) Returns the index within this string of the first occurrence of the specified substring. is there anything like that in c? The closest thing I can find is strchr, but it check for a character,

strlen is wrong because can not report if there is some error e.g. char *a; and "a" point to an array of size=size_t max that has no 0 in it

Hi, I am a game developer, sometimes "indy" and sometimes for a small-sized company. I can't speak for all game developers, but everywhere I've ever seen people working on games, execution speed has always been the most important constraint in writing code. Writing readable and maintainable code is important, but takes a back seat to...

This short program: #include <stdio.h> #include <stdlib.h> int main(void) { int status; status=fclose(0);

I have written this ob/os oscillator for securities analysis. The only thing is that the result is always negative. Such as -96. I have looked over and over this code and it looks fine to me. Is there any trouble? #include <stdio.h> #include <stdlib.h> double os(double price,double ma) { double os; os=price-ma/ma*100;

Do you have a preference on maximum line width for C++ code? I've seen the craziest debates on this most silly of topic. I have witnessed engineers spent oodles of time fiddling with line breaks just to get it right. I find in general a prescriptive rule makes for markedly less readable code, which unfortunately is a subjective argument,...

In his web pages, D. E. Knuth wrote this: (http://www-cs-faculty.stanford.edu/~knuth/iaq.html) Infrequently Asked Questions 1. Why does my country have the right to be occupying Iraq? 2. Why should my country not support an international court of justice? 3. Is my country not strong enough to achieve its aims fairly? 4. When the leaders...

Hi, Statement 1: "A dynamically created local object will call it's destructor method when it goes out of scope when a procedure returms" Agree. Statement 2: "A dynamically created object will call it's destructor when it is made a target of a delete".

Hello, I have a class member function declared as class some_class { .... virtual int call(void); }; Can I use this-> inside the function body?

Alright, here's my situation: if i use malloc like: char *mystring; mystring = (char *)malloc(80); return mystring; free(mystring);

Hi, For portability, can an issue arise if we use while(1) for an infinite loop in C? If so, should we then use for(;;)? Thanks, Rick

Hey all, I'm working with some legacy C code and I would like to compile it as a CPP file. I get the following error message: driver.cpp:87: cannot convert `void *' to `GenericStruct *' in assignment

I can't believe I've been trying to work this out for hours now, and I can't believe I couldn't find someone asking for a similar solution in the newsgroups. No wonder I hate C so much, and every time I get the textbooks out end up throwing them against the wall in rage. Thats been going on for 10 years now. Anyway, I have: typedef...

gets() is universally acknowledged to be broken and useless; however, it is still part of the standard library. Why? Is there enough conforming code out there using gets() to justify retaining it? Are there plans to deprecate or eliminate it in a future version? -- Christopher Benson-Manica | I *should* know what I'm talking about - if...