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\n");
        return;
    }

    char buffer[5];
    char lookup[] = "0123456789ABCDEF";
    int i = 0;
    int index = 0;

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

    for(int j = i - 1; j >= 0; j--){
        printf("%c", buffer[j]);
    }
    return;
}

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