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");
        return;
    }
    char digits[]="0123456789ABCHEF";
    char buffer[33]; // 32 bits max + 1 for null terminator
    int i = 0;
    while(num>0)
    {
        buffer[i++] = digits[num%base];
        num = num / base;
    }
    for (int j = i - 1; j >= 0; j--) 
    {
      putchar(buffer[j]);
    }
    putchar('\n');
}

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

    print_base(num, base);
    return 0;
}

Solving Approach