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

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

void print_hex(uint16_t num) {
    if (num == 0) {
        printf("0");
        return;
    }
    char digits[] = "0123456789ABCDEF";
    char buffer[16];

    int i = 0;
    while (num > 0) {
        buffer[i++] = digits[num&0xF];
        num = num >> 4;
    }

    for(i--;i>=0;i--) {
        printf("%c", buffer[i]);
    }
}

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