120. Convert Integer to Hex String Without sprintf or itoa functions

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

void print_hex(uint16_t num) {
    // Your logic here
    uint16_t vec[16];
    uint16_t index = 0;

    if(num == 0)
    {
        printf("0");
    }

    while(num)
    {
        vec[index++] = (num & 0xF);
        num >>= 4;
    }

    for (int i = index - 1; i >= 0; i--)
    {
        if(vec[i] < 9)
        {
            printf("%c", (vec[i] + '0'));
        }
        else
        {
            printf("%c", (vec[i] - 10 + 'A'));
        }
    }

}

int main() {
    uint16_t num;
    scanf("%hu", &num);
    print_hex(num);
    return 0;
}