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 digits[17] = "0123456789ABCDEF";
    char ans[17] = {'\0'};
    char *str = &ans[17];

    while(num){
        str--;
        *str = digits[num%16];
        num = num/16;
    }
    printf("%s",str);
}

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