Convert Integer to Hex String Without sprintf or itoa functions

Code

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

void print_hex(uint16_t num) {
    // Your logic here

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

    else{
        char hex_digits_array[] = "0123456789ABCDEF";
        char buffer[5];
        int i=0;

        while(num > 0){
            buffer[i++] = hex_digits_array[num % 16];
            num /= 16;

        }

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

    }

    
}

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

Solving Approach