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

    char hex[20] = "0123456789ABCDEF";
    char buf[5];
    int i =0;
    while( num > 0){
        buf[i++] = hex[num % 16];
        num /= 16;
    }
    for (int j = i -1 ; j >= 0; j--){
        printf("%c",buf[j]);
    }
}

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