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

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

void print_hex(uint16_t num) {
    char hex[5];
    int i = 0;

    if (num == 0) 
    {
        putchar('0');
        return;
    }

    while (num > 0) 
    {
        uint8_t digit = num % 16;
        if (digit < 10)
        {
            hex[i++] = '0' + digit;
        }
        else
        {
            hex[i++] = 'A' + (digit - 10);
        }
        num /= 16;
    }

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

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