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
    int arr[10];
    char str[]="0123456789ABCDEF";
    int i=0;
    if(num==0){
        printf("0");
    }
    while(num>0){
        arr[i]=num%16;
        num=num/16;
        i++;
    }
    for(int j=i-1;j>=0;j--){
        printf("%c",str[arr[j]]);
}
}

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