Recent questions tagged c

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c - How to obtain the correct physical size of the monitor?

How can I get the size of the display in centimeters or inches? This code does not always works correctly: ... have a constant physical size. 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 - Fused multiply add and default rounding modes

With GCC 5.3 the following code compield with -O3 -fma float mul_add(float a, float b, float c) { return a*b ... ICC) but Clang and MSVC do not. 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 do malloc() and free() store allocated sizes and addresses?

Where do malloc() and free() store the allocated addresses and their sizes (Linux GCC)? I've read that some ... free() know about. ciao, Elmar 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 - Can I make gcc tell me when a calculation results in NaN or inf at runtime?

Is there a way to tell gcc to throw a SIGFPE or something similar in response to a calculation that results in ... which doesn't seem to help. 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 - Centering strings with printf()

By default, printf() seems to align strings to the right. printf("%10s %20s %20s ", "col1", "col2", "col3" ... text width for that column is 8? 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 counting the number of set bits in __m128i register

I should count the number of set bits of a __m128i register. In particular, I should write two functions ... partially, the above operations? 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 - fork and existing threads?

On a linux system, does the child process view the existing threads the same way as the parent process ? int ... in child process as well ? 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 strtok changing its input like this?

Ok, so I understand that strtok modifies its input argument, but in this case, it's collapsing down the input string ... is now just "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 - When to use pthread condition variables?

pthread question: it appears that a condition variable only works if pthread_cond_wait is called before ... before pthread_cond_wait b785bb70 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 - winapi: CreateProcess but hide the process' window?

I am using CreateProcess to create a cmd.exe process that is passed a parameter that it executes and quits, ... way to get enviroment variables? 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 - Sending columns of a matrix using MPI_Scatter

I'm trying to write a matrix-vector multiplication program using MPI. I'm trying to send columns of the matrix ... in MPI. Thanks in advance. 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 convert integer value to Roman numeral string?

How can I convert an integer to its String representation in Roman numerals 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 - Why is it assumed that send may return with less than requested data transmitted on a blocking socket?

The standard method to send data on a stream socket has always been to call send with a chunk of data to ... with select should be used instead. 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 can I find source or algorithm of Python's hash() function?

>>> hash("x01") 128000384 >>> hash("x02") 256000771 >>> hash("x03") 384001154 >>> hash("x04") 512001541 ... and want to learn something on 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 - Two semicolons inside a for-loop parentheses

I'm customising a code I found over the internet (it's the Adafruit Tweet Receipt). I cannot understand many parts of ... I guess it's 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 preprocessor - What's the difference between the WIN32 and _WIN32 defines in C++

I know that WIN32 denotes win32 compilation but what is _WIN32 used for? 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 dynamically allocate a contiguous block of memory for a 2D array

If I allocate a 2D array like this int a[N][N]; it will allocate a contiguous block of memory. But if I try ... , is there another way 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 - Multiple assignment in one line

I just come across the statement in embedded c (dsPIC33) sample1 = sample2 = 0; Would this mean sample1 = 0; ... Is this good or bad coding? 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 are global variables bad, in a single threaded, non-os, embedded application

Most of the objections I see to using global variables make sense since they refer to issues of multiple threads ... allocated at compile time.) 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 - Unresolved symbols when linking a program using libcurl

I know this is programming questions but I'm just frustrated trying to figure out what I'm doing wrong.. I'm using ... (curl); } 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 - error C2275 : illegal use of this type as an expression

Since yesterday, I've been facing a compiling error for my C project. The project itself consists on creating a ... anyone helps ? 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 - MPI partition matrix into blocks

I want to partition matrix into blocks (not stripes) and then distribute this blocks using MPI_Scatter. I came up ... (); 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 - Understanding concurrent file writes from multiple processes

From here : Is file append atomic in UNIX Consider a case where multiple processes open the same file and append ... (); return 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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c - How to combine two 32-bit integers into one 64-bit integer?

I have a count register, which is made up of two 32-bit unsigned integers, one for the higher 32 bits ... it display 4294967296 instead of 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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c - How can I avoid "duplicate symbol" errors in xcode with shared static libraries?

I have static libraries A, B and C organized into Xcode projects. A and B depend on C. When I ... projects without experiencing this error? 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 - #ifdef inside #define

I am trying to write something like this: #define COV_ON(x) #ifdef COVERAGE_TOOL _Pragma (COVERAGE #x) #endif Is ... So is there any solution? 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 - Evaluating mathematical expressions

I am looking for an algorithm that I can use to evaluate mathematical expressions. I've seen a few questions on ... prefer a C library Thank you 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 don't we use (void) in main?

People use void main() /*empty parens ()*/ I have been taught to write void main(void) Any ideas what the difference is? See Question&Answers more detail:os...

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

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