C one-line macro that finds the digit of a int at place `i`. [E.g. getDigitAt(12345, 2) will return 3]

getDigitAt.c

/**
* Indexing starts at zero from the right.
* Needs <math.h> to work as it calls the pow() function.
* Can work on negative integers, but the returned number will be negative (aside from zero since it's unsigned) 
* Can be fixed by using abs() function and including <stdlib.h> [See line 12 for example]
* Attempting to use an out-of-range index will return a zero [e.g. getDigitAt(1234, 10) will return 0]. 
* This can be fixed with a ternary conditional and may be added in future versions of this snippet. 
**/

#include <math.h>
#define getDigitAt(x, i) (int)floor(x%(int)pow(10,i+1)/(int)(pow(10,i+1)/10))

// modified for negatives -- must include <stdlib.h>

// #include <stdlib.h>
// #define getDigitAt(x, i) abs((int)floor(x%(int)pow(10,i+1)/(int)(pow(10,i+1)/10)))


// example code driver

#include <stdio.h>
int main()
{
    int x = 1234567890;
    for(int i = 0; i < 10; i++)
        printf("%d\n", getDigitAt(x, i));

    return 0;
}