Convert Integer to Hex String Without sprintf or itoa functions

Code

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

void print_hex(uint16_t num) {
    // Your logic here
    char str[10];
    int i = 0, s = 0;

    if(num == 0)
    {
        printf("0");
    }
    else
    {
        while(num > 0) 
        {
            s = num & 0xF;
            if(s < 10)
                str[i++] = s + '0';
            else
                str[i++] = s - 10 + 'A';
            num >>= 4;
        }
        str[i] = '\0';
        for(int j = i -1 ; j >= 0; j--)
            printf("%c", str[j]);
    }
}

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

Solving Approach