C Archives - Page 17 of 22

How to allocate aligned memory only using the standard library?

I just finished a test as part of a job interview, and one question stumped me, even using Google for reference. I’d like ...

May 5, 2022
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Why is the use of alloca() not considered good practice?

alloca() allocates memory on the stack rather than on the heap, as in the case of malloc(). So, when I return from the ...

May 5, 2022
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How does free know how much to free?

In C programming, you can pass any kind of pointer you like as an argument to free, how does it know the size ...

May 4, 2022
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How can one print a size_t variable portably using the printf family?

I have a variable of type size_t, and I want to print it using printf(). What format specifier do I use to print ...

May 4, 2022
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C pointer to array/array of pointers disambiguation

What is the difference between the following declarations: int* arr1[8]; int (*arr2)[8]; int *(arr3...

May 3, 2022
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Why is volatile needed in C?

Why is volatile needed in C? What is it used for? What will it do? 18 s 18 volatile tells the compiler not ...

May 3, 2022
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Why should we typedef a struct so often in C?

I have seen many programs consisting of structures like the one below typedef struct { int i; char k; } elem; elem user; ...

May 3, 2022
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Undefined reference to pthread_create in Linux

I picked up the following demo off the web from https://computing.llnl.gov/tutorials/pthreads/ #include <pthread.h> #include <stdio.h> #define NUM_THREADS 5 void *PrintHello(void *threadid) { long ...

May 3, 2022
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Why are hexadecimal numbers prefixed with 0x?

Why are hexadecimal numbers prefixed as 0x? I understand the usage of the prefix but I don’t understand the significance of why 0x ...

May 3, 2022
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When is assembly faster than C? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Closed 11 months ago. Locked. This question and its ...

May 3, 2022
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