Recent questions tagged C

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c - How to move file from one folder to different folder in linux

How to move a particular file from one folder to another folder? What I have tried, #include <stdio.h> int main() ... me how can I do 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 - Why converting 'out of range integer to integer' leads to IB, but converting 'out of range floating-point to integer' leads to UB?

Follow-up question for: Type casting: double to char: multiple questions Assigning an unsigned value to a signed char ... , UB, or unspecified). 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 "char" a special type of integer variable?

I recently came across a statement saying that "char" type in C is really a special form of integer - one ... categorized as an integer 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 - why segmentation fault when copying memory

I'm running ubuntu on x86_32...and I keep getting segmentation fault while running this program. enter code here ... Please help me out .. 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 - malloc double free behaviour

The GNU manual page for malloc defines that when free() called twice with the same pointer (that was previously ... about this kind of 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 - GCC not saving/restoring reserved registers on function calls

I have a scenario in GCC causing me problems. The behaviour I get is not the behaviour I expect. To summarise the ... msse2 -O0 test.c -o test 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 - Ray tracing a Hemisphere

I am currently working on a basic raytracing program using C, and i have managed to so some simple shapes ex, ... } And here is the 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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c - Size of the hash table

Let the size of the hash table to be static (I set it once). I want to set it according to the ... my own structure, for educating myself. 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 - gcc inline assembly error "operand type mismatch for mov"

//quick inline asm statements performing the swap_byte for key_scheduling inline void swap_byte(unsigned char *x, ... mismatch for `mov' 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 string word by word

I am able to reverse a string. For example, I can reverse "reverse a string" to "esrever a gnirts". But I am ... (string,start,end); 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 - Different int sizes on my computer and Arduino

Im working on a sparetime project, making some server code to an Arduino Duemilanove, but before I test this ... is there another way around? 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 - Malloc call crashing, but works elsewhere

I wonder if anyone might have any insight on this... My program is crashing on this call: void subtract(data* ... arguments etc... 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 - LoadImage() returns NULL and GetLastError() returns 0

I've been searching around the net in different forums for an answer, but there seems to be no match to ... Shell_NotifyIcon(NIM_ADD, &nid); } 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 - Manipulating the search path for include files

My development environment is such that I have some_header.h in /usr/include and in /another/directory. /another/ ... with -I. 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 - Working With Floats and Integers

I've created an ATM like program which holds the money in a person's account. When the person takes out a ... ", account); 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 - Why are the contents pointed to by a pointer not changed when memory is deallocated using free()?

I am a newbie when it comes to dynamic memory allocation. When we free the memory using void free(void *ptr ... in more recent C compilers? 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 - Finding mapped memory from inside a process

Setup: Ubuntu 18x64 x86_64 application Arbitrary code execution from inside the application I'm trying to write ... fiddle around with strings? 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 - Regarding dereferencing 'void *' pointer

I am not able to find out how to remove the above warning from the below line of code. ... param[AT_MAX_NUM_PARAM]; }AT_PARSER_RESPONSE 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 - Memory leak in OpenSSL function EVP_PKEY_keygen

I just tried to generate a RSA key using: #include <openssl/evp.h> #include <openssl/rsa.h> int main(void) { ... OpenSSL 1.0.1f 6 Jan 2014 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 - exec returning 255

I have my code running on the Mac and I am getting a 255 return code from exec. The following is the code: ret = ... a lot of times, I get 255. 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 array not compatible to a pointer to 'const' array?

In a C module (aka, compilation unit), I want to have some private data, but expose it read-only to ... explicit cast violate the standard 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 - Passing a variable length 2D array to a function

If I dynamically allocate a 2D array(malloc it), int r,c; scanf("%d%d",&r,&c); int **arr = (int **) ... t find one which address the same issue. 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 - Using the name resolver of resolv.h with IPv6

I write or modify programs which perform name resolution and need a good control of the process. So I do not ... are few programs which use 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 - unexpected behavior of bitwise shifting using gcc

I have a test program like this: int main() { unsigned n = 32; printf("ans << 32 = 0x%X ", (~0x0U) << ... .1-4ubuntu9) 4.4.1 What is happening? 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 - Bind return error 88

I'm trying to just bind a socket with this : #include <stdio.h> #include <stdlib.h> #include <netinet/in.h> ... ? or 88 isn't ENOTSOCK ? 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 - Bitfields and alignment

Trying to pack data into a packet. This packet should be 64 bits. I have this: typedef union { uint64_t raw; ... .message field is kicked out. 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 string comparison fail?

Let's say I have the following code and output: for (j = 0; j <= i; j++) printf("substring %d is %s ", ... at all. What's wrong with 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 - Can bit-fields only be fields of a structure/union, never "normal", "stand-alone" variables?

The field part of bit-fields seems to suggest that they can only be fields inside a structure or union. Can a ... it won't exceed that size? See Question&Answers more detail:os...

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

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