120. Convert Integer to Hex String Without sprintf or itoa functions

#include <stdio.h>
#include <stdint.h>

int main()
{
    uint16_t num;
    char hex[10];
    int i = 0;

    scanf("%hu", &num);

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

    // Convert to hexadecimal
    while(num > 0)
    {
        int rem = num % 16;

        if(rem < 10)
        {
            hex[i] = rem + '0';
        }
        else
        {
            hex[i] = rem - 10 + 'A';
        }

        num = num / 16;
        i++;
    }

    // Print in reverse order
    for(int j = i - 1; j >= 0; j--)
    {
        printf("%c", hex[j]);
    }

    return 0;
}