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)  {
        printf("0");
        return ;
    }
    char hex[4]={0},*digit="0123456789ABCDEF";
    uint8_t i=0;
    while(num){
        hex[i++]=digit[num & 0xF];
        num=num>>4;
    }

    for (int j=i-1;j>=0;j--)
        printf("%c",hex[j]);
}

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