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)
    {
        printf("0");
        return;
    }

    char buffer[5];
    uint8_t idx = 0;
    while (num != 0)
    {
        uint8_t digit = num % 16;
        if (digit < 10)
        {
            buffer[idx++] = '0' + digit;
        }else {
            buffer[idx++] = 'A' + (digit - 10);
        }
        num /= 16;
    }
    for (int i = idx - 1; i >= 0; i--)
    {
        printf("%c", buffer[i]);
    }
}

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