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) {
    // Your logic here
    if(num == 0) putchar('0');
    int arr[20],i =0;
    while(num){
        arr[i++] = num%base;
        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