What does ** mean in C language? [closed] - c

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could anyone explain me please what does this piece of code mean?
int **d= (int**)malloc((m+1)*sizeof(int));
What are those ** for the d and the (int) ? Are they someway related to pointers?

int** d; //pointer to a pointer to an integer

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Is there any usage for ' * ' in C else than multiplication and pointer? [closed]

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Is the any more use of *, but for pointers *p and multiplication a*b ? If yes what usage it has?
Yes, it's part of multi-line comment syntax /*insert comment here*/

including "vartype" library to the beginning of the C program [closed]

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I want to have some information about (#include)
in the beginning of my C program.
What does this library do?I have search before and found nothing.....
#include is a preprocessor directive, not a library. You can read below Wikipedia page about it.
https://en.wikipedia.org/wiki/Include_directive

How i use current system time to Genrate the random numbers in C [closed]

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i have to make my random function to generate through the current system time generate between 0 to 9
You can use the modulus operator:
milliseconds % 10;
See here: http://www.cprogramming.com/tutorial/modulus.html

What does this piece of c code do? [closed]

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I came across this piece of code, but am not able to entirely make sense of it:
(((x)[y] << 8) | (x)[(y)+1])
where x is a pointer to a const unsigned char and y is an integer.
It extracts the 16-bit big-endian value starting at index y from array x.

offsetof with char as second argument. Is it possible? [closed]

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I'd love to create some part dynamically. Would it be possible to use offsetof with string as a second argument? Something like:
offsetof( tic, "close.v");
Or can I convert char to member anyhow?
The offsetof construct is a compile time operation. It can't be used with anything that is generated dynamically.

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