116. Convert Decimal Number to Binary or Hex Without itoa function

#include <stdio.h>

int main()
{
    int num, base;
    int rem[32];
    int i = 0;

    scanf("%d %d", &num, &base);

    // Special case for 0
    if(num == 0)
    {
        printf("0");
        return 0;
    }

    // Store remainders
    while(num > 0)
    {
        rem[i] = num % base;
        num = num / base;
        i++;
    }

    // Print in reverse
    for(int j = i - 1; j >= 0; j--)
    {
        if(rem[j] < 10)
            printf("%d", rem[j]);
        else
            printf("%c", rem[j] - 10 + 'A');
    }

    return 0;
}