Recent questions tagged C

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Here is what i have and I wonder how this works and what it actually does. #define NUM 5 #define FTIMES(x)(x*5) ... and 30. How does it do 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 - Is there a standard pointer size declaration?

I have struct with padding in char (oops, my bad). I would like to subtract a pointer size. Do you know a ... , or a standard macro 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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c - How to check if stdout has been redirected to NUL on Windows (a.k.a. /dev/null on Linux)?

How can I check if my program's stdout has been redirected to NUL? That way I can avoid outputting data since it ... free to post that as well. 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 - Converting float to an int (float2int) using only bitwise manipulation

I am wondering if someone could set me in the right direction with a problem I am working on. I am trying ... ). Any help would be 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 - segmentation fault after main returns

I have a long program in c over Linux, that gives me segmentation fault after main returns. Its a long program, ... Once again, thank you all. 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 - array subscript has type 'char'

I have the following code to read an argument from the command line. If the string is 1 character long and a ... of built-in function 'exit' 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 if there's '' character in command line input?

int main(int argc,char* argv[]); If there's a '' character in A, will it be split into 2 arguments ? . ... A,but there might be someone who can. 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 we check if an input string is a valid double?

If I'm reading numbers of type double from stdin, how can I check if the numbers being read are in fact valid ... numbers are in fact a double)? 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 allocate a 2 D array with contigious memory ? How Do I use it to access rows and columns? Give me an example

I have created a 2 d array which reads as follows int i,j,lx,ly;// lx,ly are the row and column respectively ... of lx, ly as shown in my 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 - errno set in child process after fork - OSX

here's a weird thing I found today on Mac OSX. After a fork, which has succeeded, errno is set at ... clue to explain that undesired 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 - Why doesn’t putchar require a header?

Reading this answer which explains the polyglot program on page not found on Stack Overflow I was surprised to read ... (like sizeof operator)? 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 XOR swap with integers trigger a warning?

I typed the following program: #include <stdio.h> int main(void) { int a = 3; int b = 42; printf(" ... implementation of C. Thank you very much. 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 - Parse $PATH variable and save the directory names into an array of strings

I want to parse the $PATH variable of Linux, and then save the directory names that are getting separated with ':' ... strtok(NULL, ":"); } 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 is the difference between calloc(10,4) and calloc(1,40)?

What is the difference between calloc(10,4) and calloc(1,40)? I see this behavior: Thing** things = ( ... take a single argument, like malloc? 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 - shmat() is returning a different "shmaddr" for same "shmkey"

Here's my setup... /* Bounded Buffer item structure */ struct item { int id; /* string index value */ ... same shmid? Thanks in advance, Z@K! 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 - raw terminal mode - how to take in input?

I have a chat client that takes in input in raw terminal mode, but I don't know about handling input in this ... be really great to see. 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 - Reversing an array In place

Okay so I've tried to print and Array and then reverse is using another array But I'm trying to create a For Loop that will ... a[j]); j++; } } 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 - Signed right shift = strange result?

I was helping someone with their homework and ran into this strange issue. The problem is to write a function ... on here. Thanks in advance! 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 automatically insert pragmas in your program

I need to write a tool that can take a C code and put pragmas on top of some functions. Which compiler ... , I would really appreciate 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 - Multiple pipe implementation using system call fork() execvp() wait() pipe() - it is simply not working

I need to implement my shell that handles multiple pipe commands. For example I need to be able to handle this: ls ... ** args; int num_args; }; 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 read the TTL IP header field when receiving UDP packets?

I am using UDP socket to send packets and I want to check the TTL field in IP header of received packet. Is ... to work only for RAW socket. 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 store 2 32-bit values in one long int variable?

I want to store two 32-bit values in a single long int variable. How would you do this on a 32-bit OS using ... ? If so, how is that done? 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 - Encode extended ASCII characters in a Code 128 barcode

I want to encode the string "Qui?ones" in a Code 128 bar code. Is it possible to include extended ASCII ... a solution in the C language. 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 - Eclipse MinGW Binary Not Found

I am attempting to run a simple C project in Eclipse. I have read through every single possible thread about ... something to do with 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 - Inputs for improving code debuggability apart from logs and error codes

Apart from error codes, error strings and logs, are there any other features which can be incorporated in the code ... is going on) at runtime? 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 - Read text from a file and realloc when needed

I want to read text from a text file line by line and do some processing on these lines. I can do all processing ... (float)line); fclose(fp); } 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 image formats are supported by Gdk-Pixbuf (Gtk-Image?) by Default?

I know that Gdk-Pixbuf supports png and jpg, but I cannot find an exact list of all the completely (or partially ... by gdk-pixbuf. Any 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 - Given a double, need to find how many digits in total

I have a double which is not necessarily positive but usually. It can be 0.xxxx000 or X.xxxx00000 or XX.00000 or ... this, any help? This is 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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