Power of any number program in c language [closed] - c

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How can write a code for power of any number in c language in program I have given base & exponent using for loop then inside for loop define power=power*base &then print base, exponent

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How to store value of a variable in c after closing [closed]

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I am doing a project on railway reservation system, my program is working fine, but when I close the program and then again start booking tickets,seat no again takes the previous value, I'm doing the project in c.
You'll need to write all of the data to a file before the program closes, and then read the data from the file when the program starts again.
That's right.

How to get the OS information at C [closed]

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I am coding a program and I wonder on which OS my program will run.
How can I get the OS info (ex - Windows 10 or not) at the code?
※ I just want to show different results whether it's Windows 10 or not
#ifdef _WIN32
printf("Windows\n");
#else
printf("Not Windows\n");
#endif

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.

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