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
    uint8_t arr[16]={0},i=0;
    char *format="0123456789ABCDEF";
    if (!num)
        printf("%d",num);
    else{
        while(num){
            arr[i++]=format[num%base];
            num/=base;
        }
    }

    for (int j=i-1;j>=0;j--)
            printf("%c",arr[j]);
    /*if (base==2)
        printf("%b",num);
    else    
        printf("%X",num);*/


}

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

    print_base(num, base);
    return 0;
}

Solving Approach