Recent questions tagged C

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c - Getting undefined reference to 'clock_gettime' error, for curl program

Gretings, I have cross compile, OpenSSl , libssh2 and finally cURL, Don't know why it has generated only static ... library also ? Thanks, Yuvi See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - strtok when process two strings at same time

New in C and pretty confused about how to deal with several strings at the same time using strtok, for a ... deal with such situation? Thanks!! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Not including stdlib.h does not produce any compiler error!

Hopefully this is a very simple question. Following is the C pgm (test.c) I have. #include <stdio.h> // ... 1.2-27) Any thoughts appreciated! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to accept SSL connection in one process and reuse the same SSL context in another process

I have spent quite some time doing my research on how to tackle this problem but could not find a working ... regarding this. Thanks a lot See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Sieve of Eratosthenes

I read up on the sieve of Eratosthenes while solving a question on Project Euler. I'm sure you guys know which question ... ); } return(0); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - what happens when you input things like 12ab to scanf("%d",&argu)?

I came across this problem when I want to check what I input is number. The scanf function will return 1 if I ... gets doesn't. So be careful. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to get newline character from scanf even if it's the only input

I'm doing homework that asks me to read an integer n representing the size of a loop and then read a line of ... // then I must get here } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why the int type takes up 8 bytes in BSS section but 4 bytes in DATA section

I am trying to learn the structure of executable files of C program. My environment is GCC and 64bit Intel ... of BSS comes from alignment? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - getchar() returns the same value (27) for up and down arrow keys

So for the up key on the keyboard, I get 27, surprisingly for the down key I also get 27. I need my program to ... =28) { printf("DOWN"); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Seg Fault when initializing array

I'm taking a class on C, and running into a segmentation fault. From what I understand, seg faults are supposed to ... faster "); } return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - GtkEntry text change signal

How can I connect a signal callback for any kind of change in a GtkEntry's buffer, including character added, ... not only checked on unfocus. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to ignore your own broadcast udp packets

For the following I'm assuming one network card. I have a component of my program which is designed to ... the multiple interface issue yet. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Intel SSE: Why does `_mm_extract_ps` return `int` instead of `float`?

Why does _mm_extract_ps return an int instead of a float? What's the proper way to read a single ... opposite of the _mm_set_ps instruction? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - sizeof long double and precision not matching?

Consider the following C code: #include <stdio.h> int main(int argc, char* argv[]) { const long double ld = ... me between 33 and 36 decimals. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Quickest way to initialize an array of structures to all-0's?

I'm trying to initialize an array of structures to all-0's, using the below syntax: STRUCTA array[MAX] = {0 ... another/better way to do this ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Function optimized to infinite loop at 'gcc -O2'

Context I was asked the following puzzle by one of my friends: void fn(void) { /* write something after ... made after the answers below. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to set up libusb on Mac OS X?

I'd like to try to make a user-space device driver using libusb on Mac, but I'm confused where to start. ... What should I include in my code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

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c - What causes a char to be signed or unsigned when using gcc?

What causes if a char in C (using gcc) is signed or unsigned? I know that the standard doesn't dictate ... difference is the CPU architecture... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is this a good way to free memory?

The function for freeing an instance of struct Foo is given below: void DestroyFoo(Foo* foo) { if ... results with significant discrepancy? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - What socket error do I get when TCP keep-alive breaks the connection?

I have a set of TCP sockets with keep-alive (interval 1 min), controlled by a select(2) loop (selecting for ... Which error will read(2) return? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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680 views

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c - hash function for src dest ip + port

So, I am looking at different hash functions to use for hashing a 4 tuple ip and port to identify flows. One I ... to be used for ip addresses ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Implementing strnstr

I am trying to implement a strnstr function into C (strstr but it checks the length), for some reason it doesn't work ... : "no"); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Need help understanding how , , and will render printf output

I wrote the following program in the C and when I run it, I was surprised by looking at the output. ... anyone please explain me the output? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Python source code for built-in "in" operator

I am trying to find the implementation of the built-in in operator in the (C) Python source code. I have ... already uses the idea I have. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Encode audio to aac with libavcodec

I'm using libavcodec (latest git as of 3/3/10) to encode raw pcm to aac (libfaac support enabled). I do this by ... , 2, 448000, buf, size); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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454 views

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c - format string vulnerability - printf

Why does this print the value of the memory address at 0x08480110? I'm not sure why there are 5 %08x ... /cs155/papers/formatstring-1.2.pdf See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - is it necessary to call pointer = NULL when initializing?

when I create a pointer to certain struct, do I have to set it to NULL, then alloc it then use it? and why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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c - What is the type of a bitfield?

I can't find anywhere in the C standard where this is specified. For example, in struct { signed ... bitfields interact with _Generic either. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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