Newest C Questions | Wyzant Ask An Expert

05/06/19

What are the differences between .so and .dylib on osx?

.dylib is the dynamic library extension on OSX, but it's never been clear to me when I can't / shouldn't use a traditional unix .so shared object.Some of the questions I have: - At a conceptual... more

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C

05/05/19

How come an array's address is equal to its value in C?

In the following bit of code, pointer values and pointer addresses differ as expected.But array values and addresses don't!How can this be?Output my_array = 0022FF00 &my_array = 0022FF00 ... more

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C

05/05/19

Using boolean values in C?

C doesn't have any built-in boolean types. What's the best way to use them in C?

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C

05/05/19

Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?

I've seen definitions in C #define TRUE (1==1) #define FALSE (!TRUE)Is this necessary? What's the benefit over simply defining TRUE as 1, and FALSE as 0?

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C

05/05/19

How to convert integer to string in C?

I tried this example: /* itoa example */ #include <stdio.h> #include <stdlib.h> int main () { int i; char buffer [33]; printf ("Enter a number: "); ... more

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C

05/05/19

Why should we typedef a struct so often in C?

I have seen many programs consisting of structures like the one below typedef struct { int i; char k; } elem; elem user;Why is it needed so often? Any specific reason or... more

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C

05/05/19

Does Objective C have garbage collection?

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C

05/05/19

Difference between a Structure and a Union?

Is there any good example to give the difference between a `struct` and a `union`?Basically I know that `struct` uses all the memory of its member and `union` uses the largest members memory space.... more

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C

05/04/19

How to achieve function overloading in C?

Is there any way to achieve function overloading in C? I am looking at simple functions to be overloaded like foo (int a) foo (char b) foo (float c , int d)I think there is no... more

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C

05/04/19

Getting an incorrect output for e^x function I made for class, and getting the wrong number of terms?

So for my Intro to computer programming class we have to write 3 separate functions, one to calculate factorials, one to calculate powers (x^n), and one to calculate the number of terms of the... more

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C

05/04/19

What is the difference between ++i and i++?

In C, what is the difference between using `++i` and `i++`, and which should be used in the incrementation block of a `for` loop?

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C

05/04/19

close vs shutdown socket?

In C, I understood that if we close a socket, it means the socket will be destroyed and can be re-used later.How about shutdown? The description said it closes half of a duplex connection to that... more

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C

05/03/19

How do you format an unsigned long long int using printf?

#include <stdio.h> int main() { unsigned long long int num = 285212672; //FYI: fits in 29 bits int normalInt = 5; printf("My number is %d bytes wide and its value is %ul. A... more

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C

05/01/19

how to use #ifdef with an OR condition?

Sorry for asking very basic question. I would like to set OR condition in #ifdef directive.?How to do that ?I tried #ifdef LINUX | ANDROID ... .. #endif It did not work? What is the... more

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C

04/30/19

Why does this for loop exit on some platforms and not on others?

I have recently started to learn C and I am taking a class with C as the subject. I'm currently playing around with loops and I'm running into some odd behaviour which I don't know how to explain. ... more

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C

04/28/19

This C function should always return false, but it doesn’t?

I stumbled over an interesting question in a forum a long time ago and I want to know the answer.Consider the following C function:f1.c-- #include <stdbool.h> bool f1() { int... more

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C

04/28/19

What is the printf format specifier for bool?

Since ANSI C99 there is `_Bool` or `bool` via `stdbool.h`. But is there also a `printf` format specifier for bool?I mean something like in that pseudo code: bool x = true; printf("%B\ ",... more

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C Linux Macros Linux Kernel

04/26/19

What is ":-!!" in C code?

I bumped into this strange macro code in [/usr/include/linux/kernel.h][1]: /* Force a compilation error if condition is true, but also produce a result (of value 0 and type size_t), so the... more

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C

04/26/19

Printing leading 0's in C?

I'm trying to find a good way to print leading 0's, such as 01001 for a zipcode. While the number would be stored as 1001, what is a good way to do it?I thought of using either case statements/if... more

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C

04/26/19

How to suppress "unused parameter" warnings in C?

For instance: Bool NullFunc(const struct timespec *when, const char *who) { return TRUE; }In C++ I was able to put a `/*...*/` comment around the parameters. But not in C of course,... more

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C Linux Gcc C Preprocessor

04/26/19

Why does the C preprocessor interpret the word "linux" as the constant "1"?

Why does the C preprocessor in GCC interpret the word `linux` (small letters) as the constant `1`?test.c: #include <stdio.h> int main(void) { int linux = 5; ... more

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C

04/23/19

How does C compute sin() and other math functions?

I've been poring through .NET disassemblies and the GCC source code, but can't seem to find anywhere the actual implementation of `sin()` and other math functions... they always seem to be... more

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C

04/20/19

C default arguments?

Is there a way to specify default arguments to a function in C?

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C Microsoft Word Syntax Highlighting

04/20/19

Syntax highlighting in Microsoft Office Word?

How do I easily highlight the syntax of PHP code in Word? I need to paste some code (ANSI C) in Microsoft Office Word, and I need some form of syntax highlighting (instead of simply changing the... more

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C Vocabulary Unix Networking

04/19/19

What do pty and tty mean?

I noticed there are many mentions of `pty` and `tty` in some opensource projects, could someone can tell me what do they mean and what is the difference between them? Thanks!

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What are the differences between .so and .dylib on osx?

How come an array's address is equal to its value in C?

Using boolean values in C?

Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?

How to convert integer to string in C?

Why should we typedef a struct so often in C?

Does Objective C have garbage collection?

Difference between a Structure and a Union?

How to achieve function overloading in C?

Getting an incorrect output for e^x function I made for class, and getting the wrong number of terms?

What is the difference between ++i and i++?

close vs shutdown socket?

How do you format an unsigned long long int using printf?

how to use #ifdef with an OR condition?

Why does this for loop exit on some platforms and not on others?

This C function should always return false, but it doesn’t?

What is the printf format specifier for bool?

What is ":-!!" in C code?

Printing leading 0's in C?

How to suppress "unused parameter" warnings in C?

Why does the C preprocessor interpret the word "linux" as the constant "1"?

How does C compute sin() and other math functions?

C default arguments?

Syntax highlighting in Microsoft Office Word?

What do pty and tty mean?

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