116. Convert Decimal Number to Binary or Hex Without itoa function

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

void print_base(uint16_t num, uint8_t base) {
    if (num == 0)
    {
        printf("0\n");
        return;
    }

    char buffer[17];
    int index = 0;

    while (num > 0)
    {
        uint16_t remainder = num % base;

        if (remainder < 10)
            buffer[index++] = '0' + remainder;
        else
            buffer[index++] = 'A' + (remainder - 10);

        num /= base;
    }

    for (int i = index - 1; i >= 0; i--)
    {
        printf("%c", buffer[i]);
    }
}

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

    print_base(num, base);
    return 0;
}