Recent questions tagged C

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total newbie here. i was trying to replace a character in char * but my program gives error #include <stdio.h> int ... ",mystring); 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 - Convert two ASCII Hexadecimal Characters (Two ASCII bytes) in one byte

I want to convert two ASCII bytes to one hexadecimal byte. eg. 0x30 0x43 => 0x0C , 0x34 0x46 => 0x4F ... The ... . Have you got an idea ? 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 - getchar() and reading line by line

For one of my exercises, we're required to read line by line and outputting using ONLY getchar and printf. I'm following ... ", c); } 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 - "target record-full" in gdb makes "n" command fail on printf with "Process record does not support instruction 0xc5 at address 0x7ffff7dee6e7"?

I was tring to use "reverse-step" and "reverse-next" command inside gdb. Stack overflow tells me that I should run ... n Well, it doesn't work 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 - Declaring zero size vector

What does the following mean? struct foo { ... char bar[0]; // Zero size??? }; I asked my colleagues ... long)? Is that just syntactic sugar? See Question&Answers more detail:os...

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

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557 views

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c - Determine if process started from shortcut

Is it possible to determine if another process/window was started using a shortcut? The purpose being to then ... in among other things. 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 a stream error indicator affects following input code?

Each stream has "an error indicator that records whether a read/write error has occurred". It is set, usually ... -of-file nor input error. 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 can I allocate a 2D array using double pointers?

I want to know how can I form a 2D array using double pointers? Suppose my array declaration is: char ... the same allocation and properties? 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 - Macros to set and clear bits

Im trying to write a few simple macros to simplify the task of setting and clearing bits which should be a simple task however ... ~(1) << (n))) 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 - Reading each line of file into array

I'm reading a file and want to put each line into a string in an array. The length of the file is ... but it doesn't answer my 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 - Casting all parameters passed in MACRO using __VA_ARGS__

I have a macro FOO(...) that receives an unknown number of parameters. I want to cast all those params to uint. Is there a way to achieve it? 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 - ALSA: Relation between period size of speaker and mic

I have audio conferencing device which has a mic and speaker. Both mic and speaker having same sampling rate set by ... (I am new to ALSA). 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 text in the display with ncurses

Is there any way to get back the characters outputted into a variable on ncurses ? let's say I do: printw ... the output format is unreadable.. 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 - Convert Unix/Linux time to Windows FILETIME

I am once again going from Windows to Linux, I have to port a function from Windows to Linux that calculates NTP ... my time to get this result? See Question&Answers more detail:os...

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

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665 views

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c - Internally capture/redirect stdout?

This seems like a bit of a computing systems 101 question, but I'm stumped. I am integrating existing code ... be doing something 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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836 views

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c - Making stdin non-blocking

I have an exercise where I am required to print a file slowly (1 second intervals) until the file ends, unless the ... 0; } Thanks for the 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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538 views

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c - what is wrong with this call to the java method?

I am trying to call a Java method from the code. C code listens to either Escape, Shift, Ctrl key press, ... version 1 COMPLETE CODE version 2 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 - Improving the performance of Matrix Multiplication

This is my code for speeding up matrix multiplication, but it is only 5% faster than the simple one. What can i ... and it needs to support C99 See Question&Answers more detail:os...

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

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589 views

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c - Having hard time tracking memory corruption - when running with Valgrind runs correctly with no errors

We have a complex program that is working well on heavy duty input (any input actually) with no multithreading ... newer version of Ubuntu). See Question&Answers more detail:os...

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

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636 views

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c - Get a screenshot of a window that is cover or not visible or minimized with Xcomposite extension for X11

I have the follow starting code to get a screenshot of a X window (the window can be covered, not visibled, or ... do this. Can you help me? See Question&Answers more detail:os...

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

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705 views

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c - How do I tell GCC asm that an input register is clobbered?

I'm trying to do a 64=32x32 multiply via the x86 mul instruction, but I only need the high dword of the result ( ... How do I do what I want? See Question&Answers more detail:os...

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

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536 views

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c - sem_post, signal handlers, and undefined behavior

Does this use of sem_post() in a signal handler rely on undefined behavior? /* * excerpted from the 2017 ... async-signal-safe functions]. 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 stop a running pthread thread?

How can I exit or stop a thread immediately? How can I make it stop immediately when the user enters an answer? I ... { game_over(); } } } } See Question&Answers more detail:os...

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

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629 views

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c - Difference in gcc -ffp-contract options

I have a question regarding the -ffp-contract flag in GNU GCC (see https://gcc.gnu.org/onlinedocs/gcc/Optimize- ... like the fused-mult sub)? 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 check that IEEE 754 single-precision (32-bit) floating-point representation is used?

I want to test the following things on my target board: Is 'float' implemented with IEEE 754 single-precision (32 ... with a simple C program. See Question&Answers more detail:os...

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

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667 views

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c - How can I set the time zone before calling strftime?

I represent dates using seconds (and microseconds) since 1970 as well as a time zone and dst flag. I want to ... print the zone of my 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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923 views

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c - redirect output from stdout to a string?

in C i want to redirect the output of a process from stdout to write to a "shared memory segment" which can be ... to redirect it to 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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817 views

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c - gdb reverse debugging avx2

So I have a new fancy cpu that supports avx2 instruction set. This is great, but breaks gdb reverse debugging. When ... , I'm out of 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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