Recent questions tagged C

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c - Initializing "a pointer to an array of integers"

int (*a)[5]; How can we Initialize a pointer to an array of 5 integers shown above. Is the below expression correct ? int (*a)[3]={11,2,3,5,6}; 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 - which part of ELF file must be loaded into the memory?

An ELF file for executables has a program (segment) header and a section header, which can be seen through ... 3rd segment) used for aligning? 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 - Convert a maximum heap to a binary search tree

We are given an array of 2m - 1 distinct, comparable elements, indexed starting from 1. We can view the array as a complete ... 2 6 / / 1 3 5 7 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 there an offline MinGW installer?

I am learning C and I want to install MinGW on my laptop. The MinGW installer is a web-installer, it requires the ... If yes where can I get it? 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 - Linux, sockets, non-blocking connect

I want to create a non-blocking connect. Like this: socket.connect(); // returns immediately For this, I ... Maybe it can be done differently? 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 access CPU's heat sensors?

I am working on software in which I need to access the temperature sensors in the CPU and get control over them. I ... using C or C++ or ASM. 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 improve the performance of this Haskell program?

I'm working through the problems in Project Euler as a way of learning Haskell, and I find that my programs are a ... with ghc --make -O). 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 - if statement integer

I think this is a simple question, but I'm struggling with the following. In my example I have the ... foobar becomes a negative number? 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 am I getting the message "Single-stepping until exit . . . which has no line number information" in GDB?

I've compiled my C program using gcc 4.4.1 using the flag -g, but when I try to step through one of ... someone tell me why this is happening? 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 do I get DOUBLE_MAX?

AFAIK, C supports just a few data types: int, float, double, char, void enum. I need to store a number ... need? Why is there no DOUBLE_MAX? 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 doesn't the compiler report a missing semicolon?

I have this simple program: #include <stdio.h> struct S { int i; }; void swap(struct S *a, struct S ... what is causing this and related errors. 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 int *array[32] a pointer to an array of 32 ints, or an array of 32 pointers to int? Does it matter?

If I write int *columns[32]; am I defining an array with 32 pointers to ints? Or is it a pointer to an ... the two? Is there a difference? 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 - Memory allocation for global and local variables

I have learnt that memory for global variables are allocated at program startup whereas memory for local variables ... allocation is wrong ?? 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 is the best way to free memory after returning from an error?

Suppose I have a function that allocates memory for the caller: int func(void **mem1, void **mem2) { ... exit points and more allocated memory. 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 extract semi-precise frequencies from a WAV file using Fourier Transforms

Let us say that I have a WAV file. In this file, is a series of sine tones at precise 1 second intervals. ... output. My language of choice is C 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 many processes are created with these fork() statements?

I believe that this creates 24 processes; however, I need verification. These questions often stump me. Thanks for the ... fork(); 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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583 views

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c - malloc an array of struct pointers

I have the following struct: typedef struct _chess { int **array; int size; struct _chess *parent; } chess; and ... am I doing wrong? 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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630 views

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c - RDTSCP versus RDTSC + CPUID

I'm doing some Linux Kernel timings, specifically in the Interrupt Handling path. I've been using RDTSC for ... -execution-paper.pdf page 27 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 - Implementation of ceil() and floor()

Just curious how are these implemented. I can't see where I would start. Do they work directly on the float's ... ceil() and floor() functions. See Question&Answers more detail:os...

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

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547 views

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c - Using snprintf to avoid buffer overruns

I am using snprintf like this to avoid a buffer overrun: char err_msg[32] = {0}; snprintf(err_msg, sizeof(err_msg) ... Platform: GCC 4.4.1 C99 See Question&Answers more detail:os...

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

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581 views

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c - Replacing "==" with bitwise operators

Using only bitwise operators (|, &, ~, ^, >>, <<) and other basic operators like +, -, and !, is it possible to ... int y) { return x == y; } See Question&Answers more detail:os...

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

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515 views

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c - How to join a thread that is hanging on blocking IO?

I have a thread running in the background that is reading events from an input device in a blocking fashion, now ... kind of back to step one. See Question&Answers more detail:os...

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

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345 views

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c - How to compile x64 code with Visual Studio in command line?

I want to compile a simple hello-world-style program using the Windows command line. cl file_name.c is easy enough. ... Bit. What should I do? 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 do you install GTK+ 3.0 on Windows?

Trying to setup GTK+ 3.0 on Codeblocks Win7. Having some trouble finding exactly how to do this. The GTK website ... + 3.0. Thanks in advance. See Question&Answers more detail:os...

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

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318 views

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c - How to find the position of the only-set-bit in a 64-bit value using bit manipulation efficiently?

Just say I have a value of type uint64_t seen as sequence of octets (1 octet = 8-bit). The ... it without neither looping nor branching. See Question&Answers more detail:os...

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

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427 views

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c - Is "char foo = 255" undefined behavior if char is signed?

The following doesn't give me any warning whatsoever when compiled with gcc 4.5.2 on x86 machine with Linux: char ... why does gcc act this way? See Question&Answers more detail:os...

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

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414 views

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c - How does one set up the Visual Studio Code compiler/debugger to GCC?

I am programming in C in Visual Studio Code, but I can't compile, as VSC only offers three compilers built in ... 8, if that matters Cheers! See Question&Answers more detail:os...

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

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569 views

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c - What if I don't write default in switch case?

int a = 10; switch(a){ case 0: printf("case 0"); break; case 1: printf("case 1"); break; } ... undefined behavior soI just asked to make sure. See Question&Answers more detail:os...

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

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