Convert Decimal Number to Binary or Hex Without itoa function

Code

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

void print_base(uint16_t num, uint8_t base) {

    if(num == 0)
    {
        printf("0");
    }
   int arr[20], i=0;
   while(num)
   {
    arr[i++] = num%base;
    num=num/base;
   }

   for (int j = i - 1; j >= 0; j--) 
   {
        if (arr[j] < 10)
            printf("%d", arr[j]);
        else
            printf("%c", 'A' + (arr[j] - 10));
    }
}

int main() {
    uint16_t num;
    uint8_t base;
    scanf("%hu %hhu", &num, &base);

    print_base(num, base);
    return 0;
}

Solving Approach