#include <stdio.h>
#include <string.h>

int main(void) {
    printf("Hello \xF0\x9F\x8C\x8E\n");
    
    printf("😀 has the unicode code point U+1F600.\n");
    printf("It encodes in UTF-8 as 4 bytes: 0xF0 0x9F 0x98 0x80\n");
    printf("We can output the 4 bytes like this: \xF0\x9F\x98\x80 (UTF-8)\n");
    printf("Or like this: ");
    putchar(0xF0);
    putchar(0x9F);
    putchar(0x98);
    putchar(0x80);
    putchar('\n');
    printf("Or like this: \U0001F600 (UTF-32)\n");
    
    // UNICODE code point less than 0x10000 (ie the BMP) can be encoded with
    // \uXXXX (lowercase u) with only 4 hex digits
    // \U must always be followed by 8 hex digits
    
    printf("Here are some others that can be encoded in format \\uXXXX\n");
    printf("\u2669 \u2669 \u266c \u266c\n");
    printf("\u26C5 \u2614\n");

    char *s = "\U0001F600";
    printf("Strlen of %s is %ld...hmm...\n", s, strlen(s));
    return 0;
}