Recent questions tagged C

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This is almost certainly a very silly question, but for some reason I'm having trouble with internet ... complete mental failure today? 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 - flexible array member in a nested struct

Is it valid C code to have flexible array members inside nested structs? So is my sample code below guarenteed to work as ... c); } free(pa); } 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 - Creating ELF instead of a.out

I need to generate a simple "Hello World" ELF32 executable using gcc. I don't seem to have the gcc-elf ... but am unsure how to proceed) 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 catch undefined macro in preprocessor #if condition?

Based on this question How to catch empty defined macro with gcc? I have another problem. How to catch ... automatic solution for our project. 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 - Sorting an array using multiple sort criteria (QuickSort)

I am trying to find out how (using a quicksort algorithm) to sort an struct array by 2 criterias. For ... to include it within the function. 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 use scanf to accept a default value by simply pressing Enter key?

I was wondering if someone could please help me with this: printf("Enter path for mount drive (/mnt/Projects) ") ... what should I use? 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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c - Reverse a AVX register containing doubles using a single AVX intrinsic

If I have an AVX register with 4 doubles in them and I want to store the reverse of this in another ... double using the above intrinsic. 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 - Heap Corruption Detected: after Normal block

"CRT detected that the application wrote to memory end of heap buffer" error. It crashes when it arrives to ... = messageFunction(message); } 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 - Unexpected value of a function pointer local variable

I have done some experiments in which I created a local variable of type pointer to function that points to ... performance and for pic code? 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 do a fftw3 MPI "transposed" 2D transform if possible at all?

Consider a 2D transform of the form L x M (column major setup), from a complex array src to a ... mpi_finalize(ierr) end program trashingfftw 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 fix "return value ignored: 'scanf'" code C6031 in visual studio

I am brand new to coding C (and coding in general) so I have been practicing with some random programs. This one ... ("PAUSE"); 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 - Comparing execution time of two functions?

I wrote two function which do the same thing, but use different algorithms. I compare the execution time using ... of benchmarking 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 - Interprocess semaphores sometimes not working as expected

I have the following C code, where variables prefixed by sm are shared by two processes proc1 and proc2. Therefore ... } sem_post( sm_f2l ); } 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 - AES ECB encrypt/decrypt only decrypts the first 16 bytes

I had function that decode AES 256 string but it return only 16 char bool decrypt_block(unsigned char ... "); Any idea See Question&Answers more detail:os...

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

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860 views

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c - Getting float value from integers

How can I get a float or real value from integer division? For example: double result = 30/233; yields zero ... display when used with a string? See Question&Answers more detail:os...

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

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874 views

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c - putc needs stdout, vs puts

C history question here. Why does the C function putc require a second parameter like putc( 'c', stdout ) ; ... is a function fputc for 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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812 views

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c - GTK window with Quartz [starting from an issue with GStreamer]

I'm trying to get basic-tutorial-5 of the GStreamer SDK to work on OSX. SDK downloaded from http://gstreamer. ... 5 Anyone else have any ideas? 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 should the [u]int_fastN_t types be defined for x86_64, with or without the x32 ABI?

The x32 ABI specifies, among other things, 32-bit pointers for code generated for the x86_64 architecture. It ... with or without x32.) 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 - Inputting float into a program that only deals with ints

I have a program, but when I input float numbers whenever the program asks for inputs, the program abruptly skips ... why this happens? 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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772 views

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c - Memory leak in OpenSSL function EVP_EncryptFinal_ex

I implemented encryption procedure based on the tutorial: http://www.openssl.org/docs/crypto/EVP_EncryptInit.html# When I run ... =0; } while(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 - Disable IRQ on STM32

Is there any way to disable all irq from Cortex M3 MCU except one ? My issue is that I have a system ... before. Thanks for your help, Regards See Question&Answers more detail:os...

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

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766 views

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c - Is it possible to confuse EOF with a normal byte value when using fgetc?

We often use fgetc like this: int c; while ((c = fgetc(file)) != EOF) { // do stuff } ... is necessary if I want maximum portability? 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 gcc return 0 instead of the address of a stack allocated variable?

As part of an experiment using custom stacks, I wanted a function to return the address of a stack allocated ... logic behind gcc's choice? 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 - Understanding recursion in the beer bottle example

I am practicing recursion in C on my own and I found this example online. However there is one thing I don't ... is incremented from 1 till 4. 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 undefined behavior to take the address of an uninitialized pointer?

N1570 states that this is undefined behavior: §J.2/1 The value of an object with automatic storage duration ... this not undefined behavior? 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 - OpenMP : Parallel QuickSort

I try to use OpenMP to parallelize QuickSort in partition part and QuickSort part. My C code is as follows: ... out where the problem is? See Question&Answers more detail:os...

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

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829 views

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c - Pointer vs Array in function definition: what is the difference between void fct1(int *p) and void fct1(int p[])?

i wanna know what is the difference between void fct1(int *p) and void fct1(int p[]) i know that both are pointers but are there any differences See Question&Answers more detail:os...

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

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964 views

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c - Compiling and linking OpenSSL on Ubuntu vs OSX

Attempt 1, Vanilla Link to Library I'm trying to use a patched version of OpenSSL (so DTLS is easier to use). ... Why does this work on OSX??? See Question&Answers more detail:os...

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

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