Recent questions tagged C

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c - Floating point numbers do not work as expected

In the code below when i give input as 1 10 2 1 2 2, sum is printed as 52 and sum3 as 31.200001 whereas it shld ... ("0.0000 "); } 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 - Dereferencing pointers without pointing them at a variable

I'm having trouble understanding how some pointers work. I always thought that when you created a pointer variable (p), ... 's what I'm after. 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 figure out which D-Bus binding to use

I'm trying to detect across all linux if screensaver is running or if screen is locked. People recommended dbus. ... qdubs, gdbus, etc? 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 - How do i print escape characters as characters?

I'm trying to print escape characters as characters or strings using this code: while((c = fgetc(fp))! ... actually prints the escape sequence. 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 - Best way to read from a sensor that doesn't have interrupt pin and requires some time before the measurement is ready

I'm trying to interface a pressure sensor (MS5803-14BA) with my board (NUCLEO-STM32L073RZ). According to ... to see my current implementation. 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 - Does Standard define null pointer constant to have all bits set to zero?

( I'm quoting ISO/IEC 9899:201x ) Here we see that, integer constant expression has an integer type: 6. ... references to the latest Standard ) 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 can't I use this code to overwrite a string?

Code: #include "stdio.h" #include "string.h" int main() { char *p = "abc"; printf("p is %s " ... dumped) Could someone explain why this happens? 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 - CPU cache inhibition

Say I have the defacto standard x86 CPU with 3 level of Caches, L1/L2 private, and L3 shared among cores. ... which needs to execute in usecs. 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 post to Google Docs Form directly

I'm working on a project where i need to post the data i acquire to a Google form and obtain the ... viewform Any help would be appreciated. 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 from a serial port after writing on it

I am working on a project that has my computer communicating with an arduino board that reads the sensor output ... problem. 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 - inotify_add_watch fails on /sys/class/net/eth0/operstate

I have used inotify in Linux, to get the event raised when ever the network interface link changes. whenever interface ... event->len; } } } 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 - Determine what day of week the week starts with

How can I determine what day the week starts with in the current locale? I need this in C, presumably via the <time.h> header. 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 - Display all process using a posix function

I am trying to display currently running process in Ubuntu. Right now I am using system() function to print ... function name or any manual ? 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 - Declare C89 local variables in the beginning of the scope?

I was trying to do this in ANSI C: include <stdio.h> int main() { printf("%d", 22); int j = 0; ... any 'official' source like the GNU C manual. 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 we can't use operator % for float and double type operands?

I am new to C/C++, so I have a couple of questions about a basic type: I have read somewhere that the ... how to achieve such a large range? 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 read terminal's input buffer immediately after keypress

I want to read arrow keypresses in my c program and replace them(immediately in the terminal itself) by some ... &termios_save); 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 - Structure assignment in Linux fails in ARM but succeeds in x86

I've noticed something really strange. say I've got the following structure defined typedef struct { uint32_t a; uint16_t ... what's going on ? 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 strtok()

I'm writing a C program to study the usage of function strtok(). Here is my code: #include <stdio.h> ... this part for my homework project. 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 - Nested Parallelism : Why only the main thread runs and executes the parallel for loop four times?

My code: #include <cstdio> #include "omp.h" int main() { omp_set_num_threads(4); #pragma omp parallel { #pragma ... the for loop four times? 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 do I tell gcc that my inline assembly clobbers part of the stack?

Consider inline assembly like this: uint64_t flags; asm ("pushf pop %0" : "=rm"(flags) : : /* ??? */) ... of memory at the top of stack? 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 - Convert int to double

I ran this simple program, but when I convert from int to double, the result is zero. The sqrt of the zeros then ... i, sqrt((double) i)); } 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 - insert array of hex codes into an integer

I'm trying to do something that I thought would be pretty basic but either I'm just ignoring something ... Any tips would be appreciated. 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 - Comparing int with long and others

I am wondering if things like this : int a = ...; long b = ...; if (a < b) doSomethings(); ... in the comparison, what about others type ? 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 13: Invalid or unsupported executable while booting simple kernel in grub with string literal

I've written a simple kernel that tries to write two characters to the frame buffer. If I define a string literal in ... I try to boot the iso? 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 - replace system() with non-blocking function

I don't want to use system() in my C program, because system(3) blocks and this is not what I want. What is the optimal 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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376 views

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c - printf displays something weird

There is such code: #include <stdio.h> int main() { float d = 1.0; int i = 2; printf("%d %d", d ... is printed wrong (1072693248 instead of 2)? 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 - Create Window without Registering a WNDCLASS?

Is it absolutely necessary to always build and register a new WNDCLASS(EX) for your application? And then use the ... and text-boxes etc.? 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 multiple lines of input with scanf()

Relevant code snippet: char input [1024]; printf("Enter text. Press enter on blank line to exit. "); scanf( ... seems to work. Any ideas? See Question&Answers more detail:os...

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

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