Recent questions tagged C

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c - How to write a better strlen function?

I am reading "Write Great Code Volume 2" and it shows the following strlen impelementation: int myStrlen( char ... write highly optimized 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 - Multicasting on the loopback device

I wish to send UDP multicast packets to loopback address and receive the same in other application. All tests done ... ,UDP_PORT); 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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534 views

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c - How to write a better strlen function?

I am reading "Write Great Code Volume 2" and it shows the following strlen impelementation: int myStrlen( char ... write highly optimized 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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431 views

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c - Multicasting on the loopback device

I wish to send UDP multicast packets to loopback address and receive the same in other application. All tests done ... ,UDP_PORT); 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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515 views

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c - Validate max integer in scanf

I want to read a int from stdin but I want to validate if the user exceeds the int max value. How can I do ... How can I check and avoid 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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392 views

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c - In Linux stubs are used for standard libraries. Why are stubs required?

In Linux, why are stubs required for standard libraries? See Question&Answers more detail:os...

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

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492 views

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c - Float32 to Float16

Can someone explain to me how I convert a 32-bit floating point value to a 16-bit floating point value? (s = ... (fltInt32 & 0x80000000) >> 16); See Question&Answers more detail:os...

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

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525 views

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c - Real-time awareness of timezone change in localtime() vs localtime_r()

Working on an Ubuntu 12.04.3 LTS box, I just noticed that localtime() and localtime_r() behave ... for mentalhealth.stackexchange.com... See Question&Answers more detail:os...

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

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522 views

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c - Why do unsigned int x = -1 and int y = ~0 have the same binary representation?

In the following code segment what will be: the result of function value of x value of y { unsigned int x=-1; ... and int thing - am I right ? See Question&Answers more detail:os...

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

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494 views

1 answer

c - How to write a better strlen function?

I am reading "Write Great Code Volume 2" and it shows the following strlen impelementation: int myStrlen( char ... write highly optimized code? See Question&Answers more detail:os...

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

0 votes

384 views

1 answer

c - Multicasting on the loopback device

I wish to send UDP multicast packets to loopback address and receive the same in other application. All tests done ... ,UDP_PORT); 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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544 views

1 answer

c - Is unsigned char a[4][5]; a[1][7]; undefined behavior?

One of the examples of undefined behavior from the C standard reads (J.2): - An array subscript is out of range, even ... 7 to a[1] is valid. 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 - SIZE command in UNIX

The following is my C file: int main() { return 36; } It contains only return statement. But if I use the ... this? what is 252 and 8 refers. See Question&Answers more detail:os...

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

0 votes

535 views

1 answer

c - Validate max integer in scanf

I want to read a int from stdin but I want to validate if the user exceeds the int max value. How can I do ... How can I check and avoid this? See Question&Answers more detail:os...

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

0 votes

391 views

1 answer

c - In Linux stubs are used for standard libraries. Why are stubs required?

In Linux, why are stubs required for standard libraries? See Question&Answers more detail:os...

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

0 votes

678 views

1 answer

c - Float32 to Float16

Can someone explain to me how I convert a 32-bit floating point value to a 16-bit floating point value? (s = ... (fltInt32 & 0x80000000) >> 16); See Question&Answers more detail:os...

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

0 votes

472 views

1 answer

c - Real-time awareness of timezone change in localtime() vs localtime_r()

Working on an Ubuntu 12.04.3 LTS box, I just noticed that localtime() and localtime_r() behave ... for mentalhealth.stackexchange.com... See Question&Answers more detail:os...

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

0 votes

664 views

1 answer

c - Why do unsigned int x = -1 and int y = ~0 have the same binary representation?

In the following code segment what will be: the result of function value of x value of y { unsigned int x=-1; ... and int thing - am I right ? See Question&Answers more detail:os...

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

0 votes

521 views

1 answer

c - How to write a better strlen function?

I am reading "Write Great Code Volume 2" and it shows the following strlen impelementation: int myStrlen( char ... write highly optimized code? See Question&Answers more detail:os...

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

0 votes

378 views

1 answer

c - Multicasting on the loopback device

I wish to send UDP multicast packets to loopback address and receive the same in other application. All tests done ... ,UDP_PORT); return 0; } See Question&Answers more detail:os...

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

0 votes

544 views

1 answer

c - Does malloc reserve more space while allocating memory?

I am observing the following behavior in my test program: I am doing malloc() for 1 MB and then free( ... some reserve while allocating memory? See Question&Answers more detail:os...

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

0 votes

732 views

1 answer

c - How do I retrieve an error string from WSAGetLastError()?

I'm porting some sockets code from Linux to Windows. In Linux, I could use strerror() to convert an ... -readable error strings from Winsock? See Question&Answers more detail:os...

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

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635 views

1 answer

c - How to circumvent format-truncation warning in GCC?

I'm getting the following gcc format-truncation warning: test.c:8:33: warning: /input' directive output may be ... or -Wno-format-truncation)? See Question&Answers more detail:os...

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

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558 views

1 answer

c - Should I free/delete char* returned by getenv()?

char * val; val = getenv("ENV_VAR_NAME"); above is a code to get environment variable, will it cause memory ... If no then please answer why? See Question&Answers more detail:os...

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

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584 views

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c - Bizarre use of conditional operator in Linux

In the 3.0.4 Linux kernel, mm/filemap.c has this line of code: retval = retval ?: desc.error; I've ... describes this behavior. Why is this OK? 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

1 answer

c - How to extract filename from path

There should be something elegant in Linux API/POSIX to extract base file name from full path See Question&Answers more detail:os...

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

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677 views

1 answer

c - Are char * argv[] arguments in main null terminated?

So I'm wondering if command line parameters are always null terminated? Google seems to say yes, and compiling on GCC ... = -arg2 3 = -arg3 See Question&Answers more detail:os...

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

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453 views

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c - Double cast to unsigned int on Win32 is truncating to 2,147,483,648

Compiling the following code: double getDouble() { double value = 2147483649.0; return value; } int main() ... convert double to unsigned int? See Question&Answers more detail:os...

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

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