Recent questions tagged C

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c - customizing completion of GtkComboBoxText

How can I customize the completion of a GtkComboBoxText with both a "static" aspect and a "dynamic" one? The ... not most of them are named. 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 - Evaluate preprocessor token before ## concatenation

I would like to evaluate a token before it is concatenated with something else. The "problem" is that the standard ... let the macros use that? 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 - Bit fields portability

I read here that bit fields are not portable. Does that mean that the code below that defines bit fields (code taken ... (status2)); 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 - Parallel Merge Sort with threads /much/ slower than Seq. Merge Sort. Help

http://pastebin.com/YMS4ehRj ^ This is my implementation of parallel merge sort. Basically what I do is, For every ... how to make this faster? 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 - Dynamic allocation of 2D array within function (using pointers to return adress of allocated object)

I'd /ike to know, how to pass pointers to dynamically allocated arrays using function arguments. This function is ... &array, 10, 10); } 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 - pragma omp for simd does not generate vector instructions in GCC

Short: Does the pragma omp for simd OpenMP directive generate code that uses SIMD registers? Longer: As stated in ... OpenMP (without -O3). 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 does this function return garbage value

I was writing a program and facing this problem that the following function used to return garbage values: int* ... with the first version? 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 - Use 32bit shared library from 64bit application?

I have created a simple linux 32bit shared library(.so) for my rendering wrappers but i've hit a wall ... library for both architectures ??? 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 - Conditional SSE/AVX add or zero elements based on compare

I have the following __m128 vectors: v_weight v_entropy I need to add v_entropy to v_weight only where ... corresponding elements in v_entropy? 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 - Multiply defined linker error using inlined functions

The linker is reporting multiply defined errors for an inline function. I have the following code in a header file: struct ... C code not 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 - Variable-length array in file scope?

I have this code for example. #include <stdlib.h> #include <stdio.h> #define array_size 3 typedef struct { int ... scope seems, you know, neat. 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 - scanf not taking in data

I am in an introductory C class and am having a problem with data input. I am in the middle of an ... importance); return; } // getInput 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 - Disable buffering for stdin and stdout using setvbuf()

When I was reading about the usage of setvbuf() , I came across the _IONBF(no buffering) mode. So I was ... Is it in terms of performance? 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 - glDrawArrays not working. Using GtkGLArea in GTK3

I'm experimenting with using the GtkGLArea widget at the moment. None of the answers to similar questions seem to ... gtk_main(); 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 - Pass array by value to recursive function possible?

I want to write a recursive function that builds up all possible solutions to a problem. I was thinking that I ... recursiveStep+1); } } } 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 leaks and seg faults when using OpenMP and OpenSSL

I have a huge code (its my school project) where I use Openssl. Everything was working perfeclty, util I decided I ... ... Please, help :) 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 does reaping children imply?

I have just had a lecture that sums reaping as: Reaping Performed by parent on terminated child (using wait or ... if it was something special? 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 - Methods to End Of File (EOF) not working in the NetBeans console

I have been learning C from K&Re2. And the above code is what is mentioned in Pg18(Letter counting program), ... 't work in NetBeans console? 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 - Storing and Accessing a 2D Array in a Struct

I am trying to code a program in C that generates a spiral based on user input and prints it to the console. I ... ) val = 0; return tmp; } 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 - Can I use scanf to capture a directive with a width specified by a variable?

I have the following code: scanf(" %Xs %Ys", buf1, buf2); Where X and Y should be integers. The problem ... I forget to keep them synchronized. 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 - SSE instruction MOVSD (extended: floating point scalar & vector operations on x86, x86-64)

I am somehow confused by the MOVSD assembly instruction. I wrote some numerical code computing some matrix ... operations on modern CPUs. 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 - Compiling a GTK3 program in Visual Studio 2012

With the release of Gtk 3 for windows I thought of upgrading my Gtk 2 C application to take advantage of the ... : http://pastebin.com/ThZpwVmg 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 possible to LD_PRELOAD a function with different parameters?

Say I replace a function by creating a shared object and using LD_PRELOAD to load it first. Is it possible to ... more field to a structure. 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 read string separated by / with scanf

I`ve been trying to this for quite a while now and after some research I had no success, so my last resort was ... (!feof(fileIn)) ? Thank you. 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 - GNU89, mixed declarations and loop initial declarations

The default C dialect for GCC and ICC is GNU89. GNU89 allows mixed declarations e.g. int i; i = 0 ... allowed but not loop initial declarations? 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 argument type of `putchar()`, `fputc()` and `putc()` is not `char`?

Does anybody know Why argument type of putchar(), fputc() and putc() is not char, but argument type of putwchar ... ? See also this and 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 - Non-blocking stdio

I'm working on a program which will be taking in user input from the console as well as printfing out in a ... have to use things like ncurses. 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 should I use a reduction rather than an atomic variable?

Assume we want to count something in an OpenMP loop. Compare the reduction int counter = 0; #pragma omp for ... atomic access to a counter? See Question&Answers more detail:os...

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

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