Recent questions tagged C

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c - gcc 7.3 128-bit unsigned integer operation

I'm confused with the usage of 128-bit integer. Please look at the test code: uint128_t test_data = ... 0101010101010101 Why is 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 - Handling zeroes in _mm256_rsqrt_ps()

Given that _mm256_sqrt_ps() is relatively slow, and that the values I am generating are immediately truncated with ... a different question...) 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 - ncurses in urxvt does not print repeating characters

Running an ncurses program in urxvt squeezes repeating characters in strings. For example I expect "--------" ... v9.22 $TERM is xterm-256color 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 - The scanf keeps being skipped

After I formatted the "direccion"'s scanf in function "leerdatos", it skip the "nro_corredor" in the second ... ); return(participante); } 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 when x is near a value

I am trying to solve the numerical equation: sin^2(x)tan(x) = 0.499999 Using a while loop in C. However ... as in this if statement? 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 - IsBadReadPtr analogue on Unix

Is there a function analogous to IsBadReadPtr in Unix? At least some functionalities of IsBadReadPtr? I want to ... useless. Any suggestions? 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 my output only print if there is another print after it?

Interesting little bug here: if (host != NULL) { printf("hi"); } else { printf("FAIL"); } return 0; ... hi abc Does anyone know why this 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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c - Padding a Bitmap pixel array

I'm making a program that creates a bitmap file in C. it's using 24-bit colour. I'm writing the file in 3 ... fwrite(&pad, 1, 1, n_img); } 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 - Check if input is float else stop

scanf("%f", &num); I have to check if thats a valid float variable and stop executing if it has symbols like @ or ! or % etc.. Suggestions? 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 would GCC/Clang accept const qualified object as initializer for object with static storage duration?

As far as I know, the ISO C standard is strict about initializers for object with static storage duration in ... I getting anything wrong here? 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 - I am having trouble assigning a char string to a char array

This is what I have now. void insert(char Table[][81], char Key[81]){ int index; index = search(Table, ... draw a conclusion please let me know. 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 - pthread_exit() in signal handler

(This question might be somewhat related to pthread_exit in signal handler causes segmentation fault) I'm writing ... insight is appreciated! 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 - system() function while SIGCHLD is ignored

Here is an example piece of my code signal(SIGCHLD, SIG_IGN); ret = system("ls -al"); if(ret < ... the POSIX specification and OS realizaiton? 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 - Does using calloc inside function, change the pointer passed as function argument

I do not understand why the second printf loop outputs different data than the first printf loop that was done inside ... I'm doing 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 - Pointer to an array and Array of pointers

As I am just a learner, I am confused about the above question. How is a pointer to an array different from ... it to my teacher. 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 - Why do i get the same string value but different arithmetic values when printing from a Doubly Linked List

So when printing from a DLL I get for all my records the same string values for the following fields: Last ... 14361 | Expenditure: 449.00 | 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 the : do in a struct declaration after a member

In: struct foo { unsigned bar : 2; }; What does the ': 2' 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 - Modulus with a negative number

Possible Duplicates: Modulus operation with negatives values - weird thing ?? Mod of negative number is melting ... why two different answers? 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 - Explain this floating point behavior

Please explain why the following pieces of code behave differently. #include<stdio.h> int main(){ float a=0.1; if ... PS: This is NOT homework. 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 - Allocate space for struct pointer in subfunction

How can I allocate memory for a struct pointer and assign value to it's member in a subfunction? The following code ... s->str); 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 - Passing by reference does not change the variable

I am trying to implement a function to change state of the menu, but my reference is lost when it leaves the ... this isn't working. 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 - system call tracing using ptrace

I wrote a program to list all the system calls executed by a command (say /bin/ls). Now what I am trying ... for this would be much helpful. 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 - change a pointer of address of another application

I need somebody to edit the title, I can't find better title. Assume a have this simple program called source.exe ... I've tried above? 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 - Get the number of elements that it has a value in array

I have an array like the following int arr[32]; This array can contain 32 element. If I added into that ... current example will get 4 elements. 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 decides what datatype that will be used to store the temporary value in?

This might be very basic but I got very curious what the reason is. When dealing with different types of operations ... int in this case in 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 - LD_PRELOADing malloc and free

I wrote my own malloc and free and compiled them in a shared library. I LD_PRELOAD that library with my program. In ... getpid() ); 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 - Portability of using union for conversion

I want to represent a 32-bit number using RGBA values, is it portable to generate the values for said number ... functions. But is it safe? 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 - NEON pack vector compare result into bitmap

I have a comparison result of comparison of two floating point operands as follows; What I need to do is ... 0] |= _mm_movemask_ps(cmp_gt_res); See Question&Answers more detail:os...

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

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