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
    uint16_t arr[16] = {0};
    int i = 15;
    if(num == 0) {
        printf("0");
        return;
    }
    if(base == 2){
        while(num){
            arr[i--] = num % 2;
            num = num / 2;
        }
    }
    else{
        while(num){
            arr[i--] = num % 16;
            num = num / 16;
        }
    }
    i++;
    for(; i < 16; i++){
        if(arr[i] == 10) printf("A");
        else if(arr[i] == 11) printf("B");
        else if(arr[i] == 12) printf("C");
        else if(arr[i] == 13) printf("D");
        else if(arr[i] == 14) printf("E");
        else if(arr[i] == 15) printf("F");
        else printf("%u", arr[i]);
    }

}

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

    print_base(num, base);
    return 0;
}

Solving Approach