Recent questions tagged c

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c - portable way to deal with 64/32 bit time_t

I have some code which is built both on Windows and Linux. Linux at this point is always 32bit but Windows is 32 ... how do I find them all? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Initialization from incompatible pointer type warning when assigning to a pointer

GCC gives me an 'Initialization from incompatible pointer type' warning when I use this code (though the code works ... in both the cases ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why is FormatMessage() failing to find a message for WinINet errors?

I'm running this to test FormatMessage: LPVOID lpMsgBuf; errCode=12163; FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | ... wrong? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - int q = {1,2}; peculiar initialization list

I came across the below initialization , it is seen that VS2012 shows an error complaining about too many initializers. in ... /* prints 1*/ } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Makefile:1: *** missing separator. Stop

I'm creating a project on c and when i make my Makefile and try to run it it gives me this error: ... it's all tabbed correctly I guess. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Meaning of overlapping when using memcpy

I am trying to understand the function memcpy() which is defined in the C library <string.h> Syntax: void * ... n is always an integer value? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - classic BPF on Linux: filter does not work

I'm trying to test classic BPF for packet filtering by attaching it to raw socket. I want to catch TCP packets ... it works for tcpdump only =( See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why does printf print random value with float and integer format specifier

I wrote a simple code on a 64 bit machine int main() { printf("%d", 2.443); } So, this ... garbage value everytime not different ones everytime. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Difference between use of pointer and array with zero elements in structs

How do the two implementations differ: struct queue { int a; int b; q_info *array; }; and struct queue { int a; int b; q_info array[0]; }; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Shifting a 32 bit integer by 32 bits

I'm slinging some C code and I need to bitshift a 32 bit int left 32 bits. When I run this code with the ... - n); Why doesn't this work? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Using `GCCs` pre-processor as an assembler

There are various open source assemblers such as gas, nasm, and yasm. They have different pseudo-ops and macro ... ; it only translates text. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is the function strcpy always dangerous?

Are functions like strcpy, gets, etc. always dangerous? What if I write a code like this: int main(void) { ... advantage of the code above? 10x! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Header for scanf_s function

While answering this question I compiled the code on Ideone and got this error implicit declaration of function ... the header for scanf_s? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What will happen if I don't include header files

What will happen if I don't include the header files when running a c program? I know that I get warnings, ... it check all the header files? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - longjmp() from signal handler

I'm using the following code to try to read an input from user and timeout and exit if more than 5 seconds pass ... to know how it might fail. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Flushing stdin after every input - which approach is not buggy?

After Mark Lakata pointed out that the garbage isn't properly defined in my question I came up with this. I' ... both failed in this test case. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Fast vectorized conversion from RGB to BGRA

In a follow-up to some previous questions on converting RGB to RGBA, and ARGB to BGR, I would like to speed up ... arguments... gcc -O2 main.c See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - carriage return by fgets

I am running the following code: #include<stdio.h> #include<string.h> #include<io.h> int main(){ FILE *fp; if ... ". I am using mingw compiler. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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295 views

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c - Intersection of polygons

There are two polygons given. how can one determine whether one polygon is inside, outside or intersecting the other ... be Concave or convex. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Correct way to malloc space for a string and then insert characters into that space?

I have two strings, str1 and str2. I want the concatenation of them on a space in the heap. I malloc ... move depends on uninitialised value(s) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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600 views

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c - Programmatically obtaining the vendor ID, product ID of a USB device on a Linux platform

I have been trying to write a simple device driver, in which I am suppossed to get the Vendor ID and ... (usb_fun_exit); MODULE_LICENSE("GPL"); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Allocating A Large (5000+) Array

I am working on an application were there are three possible sizes for the data entered: small: 1000 elements medium ... size 500k in this way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Naming scheme for typedefs

I'm working on a library that extensively used constructs like typedef struct foo_bar_s { ... } foo_bar_t; ... have for typedef naming schemes? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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267 views

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c - Inconsistency in using pointer to an array and address of an array directly

This code sample prints the array correctly. int b[2] = {1, 2}; int *c = &b; int i, j,k = ... why are the two code samples behaving differently? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to parallelize this array sum using OpenMP?

How can I make this array sum is parallelized using OpenMP ? what should be shared, and what should be private ? Here is ... " sum = %d",sum); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Using realloc (X, 0) instead of free() and using malloc with length of a string +1

So I don't really know how to put the title this time. First of all I'd like to say that I've seen ... mother tongue as it's probably obvious). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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437 views

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c - Where does the compound/string literals get stored in the memory?

I read that ; A compound literal is a C99 feature that can be used to create an array with no name. Consider ... "hello" will stored in memory? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why can't a modifiable lvalue have an array type?

From C11 standard (§6.3.2.1 Lvalues, arrays, and function designators): A modifiable lvalue is an lvalue ... array type always implicitly const? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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