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
    char arr[5];
    char *str = arr;
    if (num == 0) *(str++) = '0'; 
    else
    for (int i =3; i>=0;i--){
        if (num >> (i*4)) {
        int val = (num >> (i*4)) & 0x0F;
        *str =  (val < 10) ? ('0' + val) : ('A' + val - 10);
        str++;
        }
    }
    *str = '\0'; //terminate

    printf("%s",arr);
}

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