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

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

void print_hex(uint16_t num) {
    // Your logic here
    if (num == 0)
    {
        putchar('0');
        return;
    }

    char digits[17] = "0123456789ABCDEF";
    char hex[5];

    int pos = 0;
    while(num > 0)
    {
        hex[pos] = digits[num % 16];
        num /= 16;
        pos++;
    }

    hex[pos] = '\0';

    for(int i = pos - 1; i >= 0; i--)
    {
        putchar(hex[i]);
    }
}

int main() {
    uint16_t num;
    scanf("%hu", &num);
    print_hex(num);
    return 0;
}