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)
    {
        printf("0");
        return;
    }

    char buffer[32];
    uint8_t idx = 0;

    while (num > 0)
    {
        uint8_t rem = num % base;

        if (rem < 10)
        {
            buffer[idx++] = '0' + rem;
        }else {
            buffer[idx++] = 'A' + (rem - 10);
        }
        num /= base;
    }

    for (int8_t i = idx - 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;
}

Solving Approach