Recent questions tagged C

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c - Assigning two values with an union variable

The variable a is assigned by value 10 and the variable b is assigned by 20 with the union variable v. Then it ... and I got 20 as output. 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 - sizeof(struct) different for different compilers

Supposing I have a code like this: #include <stdio.h> #include <stdint.h> int main(int argc, char *argv[]) ... 8 of uint8_t. Could you advise? 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 - Returning a string from function

I'm trying to make a substring function on c. It must be return "cdef", but it returns nothing. How can i fix ... nText, tmp); } return nText; } 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 - Strcmp pointer from integer without cast

I'm trying to compare two character and see which one is lexicographic longer and sorting by it problem is ... way to compare single characters? 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 - Create customized header (metadata) for files

Here I want to create a header which contains other file details like metadata of other files. This code is works ... me to solve this 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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519 views

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c - The scanf function, the specifer %s and the new line

I read into C11 standard this: Input white-space characters (as speci?ed by the isspace function) are skipped, unless ... 't discard a new line? 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 get array size within function?

I am having trouble finding a way to get the array size from within a function. Here is my code: #include ... apparently that is not possible. 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 - localtime() function shows two equals date

Why when i try to show 2 dates with different arguments, that i put into localtime() function, console show 2 equal ... ; getch(); 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 - const variable value is changed by using a pointer

The output of the following program is 50 on gcc. How is it possible as x is constant variable and *p is x itself as ... ("%d", x); 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 - Replace #define X macro value with another one specified in compilation command

Given the following code: #include <stdio.h> #ifndef STR #define STR "HELLO" #endif int main() { printf(STR ... 't produce the expected output. See Question&Answers more detail:os...

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

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368 views

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c - How can I prevent (not react to) a segmentation fault?

I am not trying to handle a segmentation fault. I understand how exception handling works, more or less. I would ... Linux and/or Mac OS X? 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 - Test case for adcx and adox

I'm testing Intel ADX add with carry and add with overflow to pipeline adds on large integers. I'd like to ... rtm rdseed adx smap xsaveopt ... 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 printf output random values for double and 0.000000 for int?

I know this is a simple questions, but it came up when I was coding and I am wondering how it works now. ... curiosity so I thought I would ask. See Question&Answers more detail:os...

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

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583 views

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c - Garbage being printed when using strcpy

I have a function that will parse some data coming in. My problem is that after using strncpy I get some ... is 1319639501097446 F End of Parser See Question&Answers more detail:os...

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

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574 views

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c - LD_LIBRARY_PATH, the shared lib path in linux

I wrote a shared object, say libsd.so, and I put libsd.so and its header file sd.h in ~/lib. Here ... LD_LIBRARY_PATH=~/lib in ~/.bashrc? See Question&Answers more detail:os...

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

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424 views

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c - How can I copy permissions from a file that already exists?

I have to write a program in C (on a Unix-like system) and this is my problem: I have a file (FILE1) and ... of FILE1. Can you please 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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c - Strange behavior of Macro-expansion

Here's the code: #include <stdio.h> #include <stdio.h> #define VAL1(a,b) a*b #define VAL2(a,b) a/b ... the results of two statements the same? See Question&Answers more detail:os...

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

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614 views

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c - reading a date with sscanf

I've got to read a date format (dd-mm-yyyy;) from a char* string using sscanf with this line of code: sscanf ... book, I didn't find a solution. See Question&Answers more detail:os...

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

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474 views

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c - Generating Unique Random Numbers in an Array using Loop

So the question is to develop a [5][5] table, each containing unique numbers from 1-100 (no duplicates) so here's ... it up :/ Any idea guys? See Question&Answers more detail:os...

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

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503 views

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c - automatically changing RTS for RS-485 communication

I'm trying to setup half duplex communication in my program. I have my RS485 transceiver using the RTS flag ( ... sent before calling setRTS(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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365 views

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c - pointer file randomly changes value in middle of reading raw bitmap data

I am currently working on loading a bitmap file in C. I am kind of new to C, and I ran into a problem: ... { return BLUE; } return NOT_BLUE; } See Question&Answers more detail:os...

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

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504 views

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c - Use of 'extern' keyword while defining the variable

After seeing this answer I have this doubt. In my project, I have seen some extern variables declared and defined ... it matter by the way? See Question&Answers more detail:os...

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

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497 views

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c - How to disable "curses.h" header (a part of "stdio.h in Xcode 6.3 OSX Yosemite) to avoid conflicting function declarations

I'm trying to build a project in Xcode but I get the following errors Implicit declaration of function 'clear' is ... way to turn it off. 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 increment and dereference (lvalue required error)

I am trying to understand how pointer incrementing and dereferencing go together, and I did this to try it out ... I 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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666 views

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c - How to stop GCC complaining about "directive output may be truncated" in snprintf() call?

I'm using GCC 9.2.0 on both an ancient Linux (RedHat 5.2) and modern macOS 10.14.6 Mojave, and I ... al is safer than the worst case scenario? See Question&Answers more detail:os...

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

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424 views

1 answer

c - Finding the position of a substring in a larger string

I have created a function that should find the numerical position of the first character of a substring in ... . Any help 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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547 views

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c - algorithm for generating number combinations without repetition

I checked almost every similar post in here but I couldn't figure out how I can do what I want. What I ... the result in a strange manner. See Question&Answers more detail:os...

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

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381 views

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c - Where is the mistake in my code to perform Binary Search?

I was writing up code for a binary search algorithm. Code: #include "cs50.h" int main(void) { int n = ... really cannot figure out the mistake. See Question&Answers more detail:os...

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

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