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[16];
    int i = 0;
    if (num == 0){
        printf("0");
    }
    while (num > 0){
        uint16_t value = num % 16;
        str[i++] = (value < 10) ? (value + '0') : (value + 'A' - 10);
        num /= 16;
    }
    for (int k = i - 1; k >= 0; k--){
        printf("%c",str[k]);
    }
}

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

Solving Approach