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 hexa[100];
    uint16_t tmp;
    int i, j;
    if (num == 0) printf("0");
    else {
        i = 0;
        while (num != 0) {
            tmp = num % 16;
            hexa[i++] = (tmp < 10) ? (tmp + '0') : (tmp + 'A' - 10);
            num /= 16;
        }
        for (j = i - 1; j >= 0; j--) printf("%c", hexa[j]);
    }    


}

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

Solving Approach