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

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

void print_hex(uint16_t num) {
   char hex[] = "0123456789ABCDEF";
   char value[4];
   int i = 0;

    if(num == 0){
        printf("%d",0);
        return;
    }

   while(num > 0){
    value[i++] = hex[num % 16];
    num/=16;
   }
   for (int j = i-1; j >= 0;j--){
    putchar(value[j]);
   }
}

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