Recent questions tagged C

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c - How to link to a different libc file?

I want to supply the shared libraries along with my program rather than using the target system's due to version ... How can I do that ? 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 - Convert INT_MAX to float and then back to integer.

In C programming, I find a weird problem, which counters my intuition. When I declare a integer as the ... is just an arbitrary workaround. 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 - Bit-fields of type other than int?

I have a code which uses bit-fields declared as follows typedef struct my{ const char *name; uint8_t ... by C99 C language specification? 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 doesn't my program seg fault when I dereference a NULL pointer inside of malloc?

I use this malloc style all the time int *rc = 0; rc = malloc(sizeof(*rc)); However, it doesn't seg ... and I am dereferencing a NULL pointer. 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 - ftell at a position past 2GB

On a 32-bit system, what does ftell return if the current position indicator of a file opened in binary mode is past ... value being 2**31-1)? 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 - Is it undefined behavior to redefine a standard name?

It's easy to reason how such a code would work: #include <string.h> #define strcmp my_strcmp int my_strcmp(const ... string.h was not included? 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 this possible to customize printf?

I have some struct that I need to print frequently. For now, I am using a classical print wrapper around this struct : ... 10.04 and I use gcc. 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 does the "s" mean in the structure?

Here's a simple question. What's the meaning of the leading letter "s" in the sin_family, sin_port, sin_addr ... as struct sockaddr }; 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 - char array in structs - why does strlen() return the correct value here?

I have a simple program like this: #include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct { ... the above months[12] array. 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 take absolute value of INT_MIN

I want to perform some arithmetic in unsigned, and need to take absolute value of negative int, something like ... ...snip... } 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 a program accessing illegal pointer to pointer not crash?

A program accessing illegal pointer to pointer does not crash with SIGSEGV. This is not a good thing, but I'm wondering ... *)10; printx(&x); } 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 - Compiler support of GNU Statement Expression

Which modern compilers support the Gnu Statement expression (C and C++ languages). What versions should I have to use ... not a tcc or turbo 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 - Default case in a switch condition

I have this code: #include<stdio.h> int main() { int a=10; switch(a) { case '1': printf("ONE " ... syntax error is not detected by the 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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c - strlen - the length of the string is sometimes increased by 1

I'm doing some C puzzle questions. In most cases, I am able to find the right answer, but with that one I ... than I expected. Any idea why? 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 memcpy of a pointer the same as assignment?

Introduction: This question is part of my collection of C and C++ (and C/C++ common subset) questions ... can tell the difference, no? 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 - Problems when calling srand(time(NULL)) inside rollDice function

When I used at first srand(time(NULL)) in rollDice() function it did not work. But when I put it in main, ... status=CONTINUE; } return 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 - What is really happening in this code?

I have a code which includes a recursive function. I have wasted a lot of time on recursion but I still ... explain with reference to stacks. 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 implicit function declaration legal in C89?

Consider this C program: int main() { puts("Hello world!"); return 0; } This compiles and runs fine and ... in an obfuscated C code challenge)) 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 - Getting the command line arguments of another process in Windows

How do I get the command line arguments of all running processes in Windows using WMI in the C language? 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 - Short circuit evaluation with both && || operator

I know what is short circuit evaluation in C. a && b (operand b is not checked if a = 0) a || b ( ... , so no precedence comes into play here. 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 can I access netstat-like Ethernet statistics from a Windows program

How can I access Ethernet statistics from C/C++ code like netstat -e? Interface Statistics Received Sent Bytes ... 0 3 Unknown protocols 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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706 views

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c - Why I cant create raw socket in Ubuntu?

I'm learning how to work with raw sockets in Linux. I'm trying to create a socket like that: if ((sd = ... 'm wondering - why SUID is useless? 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 - C99 complex support with visual studio

I would like to use complex numbers as defined in C99, but I need to support compilers which do not ... partly automated through code generator. 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 - Where/how to get the "getline" function if it is missing from stdio.h?

I'm writing a program in C using Code::Blocks 13.12 on Windows 8 (the C compiler is mingw32-gcc). ... it except for writing own implementation? 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 - Serving multiple domains in one box with SNI

I'm using OpenSSL 0.9.8q in FreeBSD-8.2. I have 3 virtual hosts on my system ... use SSL_CTX_set_tlsext_servername_callback function for SNI? 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 select() for non-blocking sockets

I am trying to use the select function to have non-blocking i/o between a server and 1 client (no more) ... it out, any help is appreciated. 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 sqrt() of GCC works after compiled? Which method of root is used? Newton-Raphson?

Just curiosity about the standard sqrt() from math.h on GCC works. I coded my own sqrt() using Newton-Raphson to do it! 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 - Does mmap with MAP_NORESERVE reserve physical memory?

The mmap documentation says following about the flag MAP_NORESERVE. Do not reserve swap space for this mapping. ... has enough physical 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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