Recent questions tagged C

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Recently in an interview I was asked about what the signature of printf is. I really couldn't get a right answer ... to shed some light on this? 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 - Undefined reference to getaddrinfo

I have been getting this error for quite some time now and Google has not been of much help either. I am a ... msdn_np.c -o msdn_np.exe -lWS2_32 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 - argv: Sanitizing wildcards

I was working on an example in the K&R C book where it asks you to essentially build an RPN calculator ... execution and argument handling)? 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 - Aliasing Arrays through structs

I'm reading paragraph 7 of 6.5 in ISO/IEC 9899:TC2. It condones lvalue access to an object through: an ... often the way of these things. 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 - Equivalent to Windows getch() for Mac/Linux crashes

I am using getch() and my app crashes instantly. Including when doing: int main() { getch(); } I can't ... XCode, while Windows uses <conio.h>. 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 - Simple swap function...why doesn't this one swap?

I'm new to C and still trying to grasp the concept of pointers. I know how to write a swap function that works...I'm ... %d %d ), *a, *b); } 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 "typedef struct foo foo;" considered harmful?

In typedef and struct namespaces in C vs C++, one of the comments seems to imply that exposing some struct ... downsides to the latter variant? 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 - Which section in C89 standard allows the "implicit int" rule?

While using gcc, the code: register a = 3; static b = 3; it is allowed while using the -std=c89 - ... standards allows the "implicit int" rule? 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 - Bitwise shifting array of char's

I have got an array of chars that I'm trying to bitwise shift right >>, then & with another array. I ... trying to do the shifts/comparisons? 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 print value of global variable and local variable having same name?

Here is my code , I want to print 15 and 12 but due to instance member hiding the local value of a is getting printed ... BTW I know it in 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 - How to use lockdep feature in linux kernel for deadlock detection

I have a linux kernel driver and a user app that interacts with it. The kernel driver has a deadlock in ... help will much appreciated. 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 - Reading newline from previous input when reading from keyboard with scanf()

This was supposed to be very simple, but I'm having trouble to read successive inputs from the keyboard. ... could I overcome these problems? 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 - Cannot include both files (WinSock2, Windows.h)

I'm having a problem including both files. Now, I know I need to either include Winsock2 first, then windows.h, ... still does the error for me. 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 pthread causes a memory leak

Whenever I create a pthread, valgrind outputs a memory leak, For example the below code: #include <stdio.h> #include < ... and how can I fix 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 - Function declaration inside of function — why?

I am reading the book "Programming in C" and found in Chapter 10 an example like this: #include <stdio.h> ... test again? Is that idiomatic 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 - checking for NULL before calling free

Many C code freeing pointers calls: if (p) free(p); But why? I thought C standard say the free function ... . So why another explicit check? 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 detect malloc failure?

What is the portable way to check whether malloc failed to allocate non-zero memory block? 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 Use SetConsoleCursorPosition Func

I just wrote the code for tower of hanoi in c and I wanted to show the solution in graphical mode using ... use it?Please give some examples. 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 - Linux/POSIX equivalent for Win32's CreateEvent, SetEvent, WaitForSingleObject

I have written a small class for synchronizing threads of both Linux (actually Android) and Windows. Here is the Win32 ... void Signal() { } }; 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 null character included while allocating using malloc

I have been using C for quite sometime, and I have this trivial problem that I want to query about. Say ... into account the null character too? 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 close/fclose on stdin guaranteed to be correct?

It seems as though the following calls do what you'd expect (close the stream and not allow any further input ... (stdin)); fclose(stdin); See Question&Answers more detail:os...

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

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298 views

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c - Is there any way to write "mod 31" without modulus/division operators?

Getting the modulus of a number can be easily done without the modulus operator or divisions, if your operand is a power ... return a % 31; }; 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 - warning: format ‘%d’ expects type ‘int *’, but argument 2 has type ‘int’

So I'm new to C and am having trouble with whats happening with this warning. What does the warning mean and how can ... %s %d ", name, age); } See Question&Answers more detail:os...

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

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235 views

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c - How do I deal with a data race in OpenMP?

I am trying to use OpenMP to add the numbers in an array. The following is my code: int* input = (int*) ... right result for sum. What's wrong? 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 - Build OpenVPN with specific OpenSSL version

Similar questions have been asked before, but the answers no longer seem to apply as the flags have changed for the ... no responses as of yet. See Question&Answers more detail:os...

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

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400 views

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c - Is conversion from unsigned to signed undefined?

void fun(){ signed int a=-5; unsigned int b=-5; printf("the value of b is %u ",b); if(a==b) ... just want clarification on questions 2 and 3 . See Question&Answers more detail:os...

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

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694 views

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c - library not found for -lrt with QtCreator [mac os]

i'm getting some troubles with QT it builds with option "-lrt" i'm using mac os 10.6 with QT creator ... collect2: ld returned 1 exit status See Question&Answers more detail:os...

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

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397 views

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c - Malloc compile error: a value of type "int" cannot be used to initialize an entity of type int (*)[30]

I must have tried 20 ways of doing this by now. I really need help, no matter what I do i get a error ... allocate a 2dArray of int[160][10] See Question&Answers more detail:os...

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

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